Cannondale SuperSix VS SystemSix (Review & Head-to-Head Speed Tests)
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- čas přidán 20. 06. 2024
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The Cannondale SystemSix VS the SuperSix. In this review today I will be comparing both these road bikes and sharing five separate speed tests to see which bike comes out the fastest. Probably no surprise, but interesting to see the differences. In between speed tests I will also share the weight of each bike. While this set up comes with SRAM Force 12 speed AXS eTap and Caden carbon wheels, we compare the stock setups on the Cannondale website to the Specialized Tarmac, BMC Teammachine, Merida Scultura, Canyon Ultimate, Specialized Venge, Trek Madone and the Merdia Reacto. I will conclude with which of the SystemSeix VS the SuperSix I'd prefer to take home and why.
ACA Setup: • Video
TIMESTAMPS:
Intro: 0:00
Testing Protocol: 1:45
Speed Test One: 2:47
Weigh in: 3:42
Speed Test Two: 5:08
Pricing: 5:33
Speed Test Three: 7:01
Riding Experience: 7:41
Speed Test Four: 12:55
Rating System: 13:21
Speed Test Five: 14:23
My Preference: 14:58
Speed Test Google Doc: docs.google.com/spreadsheets/...
#Cannondale #SystemSix #SuperSix - Sport
Now that’s how bike tests should be done! Well done Cam. You got me thinking now about changing my frame from the BMC Timemachine to the SystemSix 😂
Haha! Love the TIMEMACHINE. Way more compliant ✅
Was really looking forward to this vid and wasn’t disappointed! Thanks for the great content.
Excellent review Cam - deeply appreciate the effort to put this together.
👍
Nicely done comparison test. It was great that the ACA team made both bikes available so you could do something like this.
Very nice review! I have the SystemSix myself and have no issues with creaking whatsoever. Been riding it for more than a year now (5000km+).
Your CZcams Content Creator dedication is off the chain! Amazing that you would go as far as to paint the gate to match the C'Dales for a greater visual impact! Outstanding work! 😂
Very good overview of those bikes. Well presented and helpful.
Just starting to watch and I'm already so excited!!
Thanks for the review Cam. I’m looking for a new bike and was thinking of getting another Super Six. I might check out the Merida bikes now for some comparisons.
Good work Cam, good to see some good colors on the Cannondales again as well.
Fair review ! Look fwd to your reviews Cam .
Great test.
Regarding BB30, C’dale has widen their bb and this helps to decay the wear of the bearings.
The bearings of my Synapse for example are still great after four years of use.
The bearings of my Scalpel I had to replace after three years, but this bike is used a lot during wet condition with a lot of mud here in the Netherlands.
Love the improvised bike rack! Great reviews.
Big "Darrel Eastlake" thumbs up. One of the best most comprehensive reviews online, side by side with another bike, yet practical. Your experience here shines through mate, What will be interesting is if you can continue doing these test (your spreadsheet for example) with other bikes. One of the guys that rides in our group has a Systemsix, as I was trying to figure out how his average is always 2kmph faster as compared to when I'm up front. You just answered it.
Haha! Cheers mate, yes I’ve realised I’ve started something with the spreadsheet. Also it was you that suggested the ratings system on they Patreon group so thanks again! 👍
Great and very useful comparison!
I own a SystemSix and it’s the funnest race bike I’ve ever owned. My BB has never creaked and that issue is not exclusive to Cannondale either. Some people just don’t like press fit BB’s. There is one piece to this that is off. The SystemSix is called that way because of 6 things that make up this bike. One of those 6 are the wheels. They come with their Knot 6.4 wheels which make a significant difference to the Knot 4.5 on the SuperSix, but I understand the frame only comparison. Lastly, part of the enhanced comfort on the SystemSix comes from how you set up the tires. I’m 80kg and ride 60-70psi on a tubeless setup with 25mm tires. This greatly improves comfort without loss of speed. Great review all in all. 👏
5-6 years ago a 64mm rim would be considered extreme. Crosswinds!! Today it´s the new "normal" to enhance aero benefits. Rgr
Hey there, thanks for the info on system 6 bike as to why it was called by that name. I do own one. it's an older model, about 10 yrs old. I bought it used. Anyway, I really enjoy riding it. It's my favorite for riding long distance compare to Specialize S Works.
This was an excellent review. I really like how you covered both the objective and subjective qualities. I had a similar experience when I test rode a supersix during a group ride at my local bike shop. I was not impressed during the mostly easy hour I spent on the bike. I think your review highlights the importance of longer more varied types of rides needed to fully appreciate all of the qualities of any given bike. That’s something that most shops may not be able to accommodate however. But good thing there are folks such as yourself adding value to the discussion with lots of excellent data to consider.
Cheers Mick
With the super 6 I find it really shines on rolling terrain where I can keep the momentum up. It just seems to have that extra free energy to get me over the rollers and it seems like it is worth putting in a little more effort, even getting out of the seat because the more I put in the more it gives back. On a long, steep grinding hill it seemed to lose that extra advantage. My confidence on the bike especially on descending went to another level. Also it is forgiving like when I hit a stone on the road, it stays on course. Amazing on gravel
Thank you! Great video! I would love to see such a video between BMC Teammachine SLR01 and Timemachine Road TMR01 :-).
Thanks for the review! I went from a 2012 Cervelo S5 to the SystemSix in June and don’t regret it at all. It’s fast on my bunch rides and comfortable enough on rides over 100km. I live in NZ and it climbs pretty well over the hills. I wholeheartedly agree with your conclusions.
Nice one mate thanks for sharing on the thread
Great looking bike ,the bike hanging in the lounge room is art
Great video Cam, this comparison was really comprehensive. I think you'll always want the bike that you don't have. I have an aero bike and I keep looking at lightweight climbing bikes.
Yes well said mate
thanks for taking the time to make videos bro
👍
Best bike review I’ve seen! Keep it up!
Thanks mate appreciate the kind words.
Top marks for effort, that was an excellent presentation - you should have all the bike companies lining up at your door with their stable of bikes for testing. That really was a great use of data to give more than "the feel" which most channels use to describe their experience. For such a simple machine, bicycles are by far the most complex due to the limited input power and basic physics! Looking forward to a lot more bike comparison videos of similar quality - maybe you should be careful what you wish for! Great job Cam!!
Cheers mate 👍
An amazing thorough review, loved it. I think the SystemSix clinches it for me, the looks and the speed. Like so many others, I appreciate all the work that went into producing this comparison,verging on scientific but there was art too laced with passion.
Cheers Alan.
This comparison is too well done to be only seen 35k times. Maybe because they're out of reach of the average consumer but excellent testing methodology and thanks for spending the time.
Love this! Great job with this review. I love my SystemSix but will also be adding a SuperSix or a CAAD13 soon.
Cheers mate and nice 👍
Enjoying my caad13 that I had custom build, i bought the frame Wich comes with the Hollowgram carbon seatpost.
Great video.Thanks again for giving me something cool to watch.
Cheers Ryan
That is some awesome well done review! Well done Cam :-)
Cheers Christiane 👍
My 3T Strada (similar profile to the SystemSix) now has frame protector stickers everywhere!
Such a great vid. Thanks, mate!
👍
Own a SystemSix myself and certainly recognize the cons but, as you said, no dealbreakers. You learn to accept and deal with them as that bike just puts a huge smile on your face every time you ride it
What cons on Systemsix you having?
@@qamarulhaziq7194 Cam covers it pretty well. It's a bit of a battleship so do not expect the nimblest of bikes but it still handles ok (even taking into account the built-in limiters at the front). It can be a bit harsh but after switching to some 28mm tubeless tyres it's not that uncomfortable. The aero seatpost is that long/wide that it limits your options of rear lights. I live in pretty much the flattest country on earth so the weight (although not that heavy compared to similar aero bikes) does not really factor in for me. Paint quality (at least of the 2019 model I have) is not the best. All in all, no dealbreakers to me compared to the overall experience of speed and control it gives you
I had a 2013 SuperSix for years and a year and a half ago I bought a 2019 SuperSix disc. I had creaking on the 2013 once when I had it a short time. My bike shop redid the BB and I never had any more issues. My new one started doing it a couple of months ago and a BB service took care of it. So, that is not bad at all. My gravel bike with a threaded BB started making noise and I simply serviced it after having it a couple of years. So, no real difference. The only difference being is that I will work on the treaded BB myself as I have not worked up the courage to buy the tools and try servicing the press fit BB.
This is very nice video comparison two connadale super bike. As i know, you do have one giant tcr advanced SL before and BMC teammachine. I really hope you can make these 3 nice bike comparison.
Great review!
Cheers Duncan
results seem to fit with my friends who have a SuperSix and SystemSix between them. SystemSix is super fast in bunches, lapping and sprints but not as quick descending, especially if windy. owner is mid-40s but luckily quite flexible. SuperSix is beloved as just an all round great bike and finds nice balance between comfort and great performance.
Great video really enjoyed it.
Cheers mate
Great review Cam. I am a big fan of my SystemSix that I bought this summer.
Cheers mate, and I'm not surprised!
@@CamNicholls The truth is that they are both great bikes. I very nearly ended up with the SuperSix. It came down to inventory and how quickly I could get my new bike....and I'm sure I would have been happy if it had worked out the other way as well. It doesn't seem like there is a ton in it for someone who is training primarily for fitness and for some quick social rides with the local club.
Great video Cam, as a Systemsix owner (and ex owner of a supersix) your conclusions tally with my opinions. Theres something really special about the Systemsix. It feels like a how a superbike should feel. It's exciting to ride and the sense of speed is huge.
👍
I'm a SuperSix owner considering a SystemSix purchase, and your comment pretty much helped me make my mind. Thanks. :)
Nice vid. The wheelbase dip you saw between the 54cm to 56cm frame is accurate. Look at the head tube angles and how it jumps from 71° to 73° between smaller vs large frames. This dramatically changes the front center. C-Dale's philosophy is to keep Trail & Chainstay constant across sizes, so you see inflections with the HTA, FC, and wheelbase at that mid range size.
Other brands will keep wheelbase constant, but you instead see funky stuff with the trail or rake (which is why some manufacturers hide these important geometries)
Interesting, thanks for sharing mate
Great review of the two with a proper comparison... totally agree on the price valuation point you made... too bad the Venge is gone cause I would’ve loved to hear your thoughts on it vs the systemsix side by side.... 🍻
👍
Great review.
As for the creaking, I have the previous supersix hi-mod disc. Solved the creaking issue with a threaded BB30 bottom bracket from wheels manufacturing, as opposed to the pressfit that comes with the frame. I think maybe the issue is when running Shimano you need a spacer/reducer as the Cannondale hollowgram crank is a bigger bore. With WM bottom bracket no spacer/reducer is needed to adapt Shimano cranks (designed specially for Shimano hollowtech). Smooth and quiet.
I'm currently choosing between these two bikes. Great vid.
Nice one, which one is it?
@@CamNicholls I have a couple of other bikes more like the supersix at the mo, but nothing crazy fast like system six so very tempted by that. Also going to check out reacto
Thank you . This is very useful. So many other reviews comment on a bike independently so it feels impossible to compare it to other options. But that's what we want from reviews.
One thing I'd be very interested in - is to also add the CAAD13 to the mix. I've seen some reviewers say it feels VERY similar to the Super Six and that in terms of feel/comfort, they probably wouldn't be able to feel the difference in a blind test. This makes me wonder if the Super Six is worth the price difference. It does seem a bit more aero, but I'm not racing.
I've found myself wondering why the Cannondale-sponsored pro-tour teams use the Super Six so often instead of the System Six, whereas Canyon-Sponsored teams use the Aeroad quite a lot. If the System Six is so stiff in ways that it's draining, that choice of the Cannondale teams for grand tour bikes makes sense.
Awesome video as always Cam! I thoroughly enjoy your approach and candor, it's definitely refreshing! If you get the opportunity to ride the new Scott Foil, I'd be extremely greatful to hear your thoughts.
Cheers mate 👍 I’d love to get access to that bike!
Thanks for making my decision even harder 😂😂! Just like you I like comfort but that need for speed likes to take over
Good comparison. I had both for a while and for me, I preferred speed and choose SystemSix.
Good choice
Love my system six!
Cam watched your test with interest and picked up my brand new super six evo di2 this morning as had been researching for a while and your review helped.
Unfortunately for me 1.84km or 5.03 min into my debut ride a car did a uturn in front of me and I was superman. I was ok asides from bruising, car damaged, bike appears to be a write off
All in had my new super six for 5 hours!
Sums up 2020 perfectly!!!
AH, SHITE! So sorry to hear that mate, hopefully insurance will cover a new one!?
I got my hands on a systemsix a few months ago and can absolutely confirm the results. It is very stiff not meant to be confortable. But it is also super fast! While the handling is not as easy as with my other bike (canyon endurace) on small raods it sometimes feels too fast. For me this expensive combination is perfect- one bike for normal rides and to enjoy the road and the systemsix to rule the boys at the local ride
Thanks for sharing on the thread!
Pretty good review, both are clearly super hot bike. I think bike have reach a point where it really come down to rider preference and your riding style these days. I would take the supersix.
Cam, whenyou rate the comfort of the Systemsix, how does it compare to an aluminum bike like a CAAD12 or Allez Sprint?
Haven’t ridden the CAAD but similar to an Allez. The Allez is a very aggressive geo too
Great reviews and breakdown of both frames. Just checking it was the standard super six evo and not the "hi-mod" frame?
I'm looking at a super six evo ultegra di2 post bike fit as a suitable candidate and this review has helped immensely. Cheers
It was Hi Mod, SuperSix is a great bike. Can't go wrong
Great video!! Would be cool if you could get hands on some italian bikes, like the dogma f12, bianchi, wilier etc and compare them to the ones you have already ridden/tested. greetings from Vienna!
Yes, that would be cool! I have tried in the past btw
Great vid again. If you had a choice between system6 and merida reacto that you tested. What would you pick and why
Merida if it was my one bike, it rides better.
Hi nice video by the way, how do you think the systemsix compares to a scott foil as they have similar geo's and both been aero bikes....
Enjoyed your comparison very much! As a System Six owner I haven't had any problems with the BB30 in 3K miles. My bike came with a small blemish on the fork from the stop. I am meticulous in cleaning and maintaining and haven't had any issue with abrasive grit like your's had. Overall I don't like the design or the aesthetic on the fork/headtube interface. Other manufacturers seem to have handled this better. My ONLY complaint about the bike. Mine is the lower spec ballistec carbon, perhaps that's why I find it more comfortable? More flex? I also have the stock Knot 64 wheels which are very stiff. Thanks again!
Interesting to hear, thanks for sharing on the thread mate 👍
Love your channel. Is that the Saint Saens organ symphony in the background? Just bought a used 2018 SuperSix Evo for $4k USD, the most I have ever spent on a bike. It arrives tomorrow and I am hopeful I will love it and feel it worth the investment. Your reviews are helping, thank you!
I have a 2010 Cannondale SuperSix HiMod and I've never had an issue with the BB30 bearings. Every few years they'll feel worse for wear and I'll tap them out and replace. No creaks, no weirdness, no fuss.
I think the problem is this. People don't like to buy the right tools to remove and press the bearings in and do the job right. A lot of the "local bike shops" have to deal with some kids bike and then a Tour de France level bike and sometimes don't give the level of care and attention that's required. Maybe the mechanics there don't RTFM and come up with their own way of doing things because at just above minimum wage, they're "pro mechanics" that do this for a living and know better than the folks that designed it. Which is why I do everything myself and have never encountered mystically BB30 creaking or the much touted Dura Ace 7900 mechanical gear cable snapping. You'd think over 11 years that I would have had one cable at least fray, right? Nope. 11 years and no BB creak. Hey, I'm just a random guy that sits down and reads the manuals and buys the right tools for the job and "mystically" things always work as intended. Odd that right, read the manual and things work. Who da thunk it!
Real world 👍 honest 👍 helpful 👍 concise 👍 great review. 👍 👏👏👏
Cheers Scott.
Cheers Cam, good to see side to side comparisons done carefully. would be good for you to replicate these tests (conditions notwithstanding) for other bikes...in the end it seesm to be about personal bias towards comfort/cost given that the system six is quicker everywhere...
Yep agreed 👍
Another top bike/bikes review. I do enjoy these. Yes price of most bikes are out of my league unless I sell the Mother in Law. But I enjoy looking at the different ways bikes are made to get them small marginal gains.
haha, cheers Steve
I've owned my Systemsix for about a year and a half and it's the only aero bike I've ridden so I can't comment on the comparison. However, I noticed that the bike you tested was not the hi-mod version with the integrated headset. That affects the frame aerodynamics and the weight.
I agree that the bike really liked to go straight and fast.
As a 73 year old riding with others 10 to 20 years younger than I on group rides I haven't seen anything on the market I would rather be riding.
Oh, never a bottom bracket creak yet.
Thanks for another great video.
well done. Only such a test are worth to watch made by yourself and indepedent
Awesome! compare it to giant's Propel...very interesting
Love ur videos cam! I ride a supersix evo 2019. ❤️ 🇵🇭
Cheers mate and nice bike 👍
I’m in the urban legend camp... I’d wager any BB30 issues come down to poor maintenance, ie: user error. Any high performance road machine should have every part serviced regularly, say every 1,000 miles at minimum. I have no issues with my BB30, and if it starts creaking, I’ll take that as a sign it needs service. Think of it like a fan belt on an automobile...
Id be servicing my bike every 4weeks if that was the case
Great review bud!!! Fine bike just don’t like colour...... too flashy 😀
Ah brilliant. Have my jungle juice for my day off, gonna enjoy this.
Hi Cam, I know it's an old vid but would really appreciate your answer. I have a SuperSix and really like it and now I'm thinking about switching to (buying) a SystemSix as my main and only bike. Long story short - do you think it's worth it? Thanks a lot if you find a time to answer.
Hi, have you make a choice? I am facing the same problem.
@@weisong3593 yes I have. I've bought a SystemSix ind I'm loving it. Zero regret. I definitely recommend buying one.
lovely.. supersix looks like a winner
Owner of a HM Supersix heve, the frame really never disappointed me, very confortable, the only thing is that when i tried my Super with standard 35 hollowgram wheels back to back to an emonda with dura ace wheelset, the difference in stiffness was really noticeable, mine was more comfortable and maybe better on the flat, but up the climb it felt like an overcooked spaghetti compared to the top tier emonda
Thanks for sharing on the thread!
Love your videos! Although I do have one suggestion. When you are doing head-to-head comparisons, you're using wattages that not many riders may be able to put out. How about testing the same sections at, for example, 170w, or 200w? Something that commoners like us can manage 😂
Once again, thanks for your awesome videos!
I am 80kgs though.
@@CamNicholls I'm currently 85kg and nowhere near your power numbers LOL.
Anyway I think it's an Asian thing. I don't know anyone that can put out your power numbers. Maybe it's 'cos we generally are smaller (and those who are your size are weak, like me 😂)
My suspicion is the reasons for the speed variances are likely too be significantly smaller with a more controlled study.
Aero frame benefits are generally overstated by manufacturers using inflated speeds and the speed gains from “stiffness” relatively insignificant.
Position is 1,2,3 then skin suits and wheels as the big ticket items of course.
I’d consider the aero frame benefits if I was Tony Martin otherwise I’d chose the most comfortable frame with the geo that allowed for the optimum position.
Fair call, thanks for sharing
I have an older Supersix. And I'm struggling on figuring which of these two bikes I would rather have.
The fact you scored the Supersix higher, but then mentioned you rather take the Systemsix home feels like the exact dilemma I have. Systemsix is sexy and the allure of speed. Or the comfort of the Supersix.
Hi Kraziken0, could you tell me your final solution? I am facing the same problem. Originally I was looking System6, but, I am afraid about the comfortable. I usually ride 100km.
Thanks Cam. I was expecting, based on your rating, for you to prefer the supersix evo. Eitherway I'd be happy with either but i think I'd need to test ride both myself. One thing though, I'd never buy a fluro yellow bike.
Haha, I get that mate. Cheers
Cam, can you please review Open Min.d road bike. Would like to hear your thoughts on integrated seatpost.
Not sure how to arrange that, but good to have the suggestion.
Sold my 56cm Super Six EVO as I needed the top tube length of the 56 but the head tube length of the 54, plus I found a sense of wheel flop as the front end was long bb to front axle. Madone is the best aero bike even though the bars are overly stiff.
Thanks for sharing Gary, interesting to hear your thoughts 👍
I have the superSix and absolutely love it but get caught on downhills by some aeroframes and might need the SystemSix too.
Very late here . . . I have owned several C'dales over the years and have replaced the BB 30s myself at appropriate intervals. I have never had a problem with noise/creaking/premature failure. Maybe I have just been lucky? I hear/read the stories too, and think they are exaggerated for some reason I can't figure out. I have only owned the various CAADs (aluminum) so it is possible the problems you hear about are occurring primarily on C'Dale carbon frames?
Just wondering did you change the cranks for your shorter ones Cam? If not how did it feel going back to the “normal” length of the 175’s now you’re on the shorter ones?
To be honest mate, I’m not really noticing it which is bizarre. The cadence it definitely lower though on the 172.5s.
Close call, as you’d expect when six of one faces half a dozen of the other. 😉
Really nice! I'd like to see this with all big brands in 1 video, but that'll be an insane amount of work to create :D I think even this video will have taken much time to prepare, film and edit...
How do you think they will compare in a real steep 10-15% climb? Will the weight make much difference?
Cheers mate, I think the SuperSix would win that. Quite well
Aero bikes are slightly odd mine doesn't feel that fast or nimble especially out of the saddle but the speed you can cover ground in is amazing. It also always feels like it wants you to go faster as if it's egging you on. I had a couple of summer rides where i had IF just over 0.9 for 3 hours solo which i've never come close to on any other ride. Ride comfort was terrible so went tubeless on a 28mm which sorted it out and it's on par with the caad12 now which i've done 150 mile rides on.
BB30 issues are overrated especially by some internet youtube 'stars' Have a 2015 Hi-mod evo with 12k miles still on the original BB and a caad12 which i use through the UK winter again similar miles again both on the BB's they came with. When The cranks come off they are checked and greased. I did have squeak when i built the evo up but that was due to the rubbish SRAM/Quarq Wave washer a pretensioner not being setup correctly it's been silent for years now.
Compare the stack/handlebar height of the SuperSix at 13:29 vs the SystemSix at 13:31. That alone could explain the time gaps. So yes, while I appreciate the enormous effort that goes into producing a video like this, I'd be a lot more convinced of the aero superiority of the SystemSix (in real world conditions) if the stack heights were the same. Were the handlebars the same width?
Yes same width
I forget which of these two you used for the first part of your 300km ride, but I caught the part where you switched bikes and said you wouldn't do the full 300k on it. And I think that's pretty important point when rating a bike. Yes, it seems like the criterium scene is as significant a part of AUS racing as it is in the US, and the SystemSix may be perfect for that...but if my legs, arms and back are going to have to absorb road vibrations for 4 or 5 hours during a century (Gran Fondo race), are they going to be able to still give me 100% coming into the last 5kms where that bike *should* excel, or am I going to be drifting backwards? Can I trust it to corner confidently enough to 'get' all of that speed out of it?
TBC, I think this was a solid review and I think your value ratings for both kind of indicate your own doubts about spending that much on a bike that you wouldn't use for anything but straight line racing.
It was the SystemSix for part of the 300
Are these custom colours or just the colour ways you get in Oz? Love the fluoro yellow!
Not sure mate, I know they're last years colours designs though, assuming they're stock
Any idea how much more the standard wheels on the systemsix weighs than the ones you used? I bought the 2021 version with Pro team colours and complete bike as is with ultegra di2 is waaay heavier than the one you used. It rides like a bullet though. Climbs a bit like a stiff horse on steep climbs. Cheers for some good content.
Sorry I don’t know
I am curious if in Australia if road bikes are setup with the same brake arrangement as here in the USA. I have heard in the past that our practice here in the USA of having the left hand brake lever operate the front brake and the right hand lever operate the back brake might not be the case across the rest of the world (I.E. the UK for instance). Is this true or not?
Yes we have them the other way around! We like it backwards here
If you drink the water out of the bottle does it reduce the weight or simply transfer it to a separate location (ignoring sweating it out of course) 🤔
both bike are hi-mod?
awesome video review!
Yes
Would be nice to see a comparison with the merida reacto with the same wheels ( at least the front one which has the most gains )
I’ll see what I can do. These are big jobs!
I realize it takes away from the aero advantage but do you think 28mm tyres would fit?
Nice Job here Cam . Can u pls ride an s5 Cervello pls & give us Ur feed back.
Own a SuperSix Evo, not a peep out of that BB with more than 5K miles on the bike, I say Urban Legend. Great bike 👍🏾
Thanks for sharing Julian.
Canyon Aeroad also has a stack length of 560mm. For the 54cm size. I don’t think we can discuss stack alone without coupling it with the reach
Good test. But it would be more fair if you setup both bikes with same saddle and handlebar height from the ground. I can clearly see from pictures that supersix (due to it's stack and amount of spacers) is setup at least 2cm taller at the cockpit aera. You have much bigger drop on systemsix, which is providing additional aero gains. Another good thing may be if you test bikes on maybe 5% or even 8% gradient, to see the difference, considering cannondale's statement about systemsix being faster everywhere up to 6%.
At the 5:08 mark you can see that the supersix stem is down as low as it can go. That single black spacer is necessary. Without it you have a large exposed hole at the top of the head tube.
That's a bike of mechanic, different bike. If you go to the end of the video where Cam is comparing both bikes, the supersix has couple spacers, same on the beginning of video you can see Cam is handling supersix with spacers - tall cockpit area.
Great review. I think if you could only have one bike in the shed, the System 6 is the one. If you were purchasing an N+1 Super 6