Geometry Hack: How to Change Your Bike's Effective Seat Angle: experiMENTAL with 9point8's Fore Head
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- čas přidán 5. 09. 2024
- Today we talk about two ways to hack your bike's effective seat angle. The new fore head from 9point8 is one of my favorite products that allows me to tweak a bike's geometry. I love that companies like 9point8 are helping us make bikes fit us better. You can shift your saddle forward another 25mm or rearward another 25mm with this amazing adapter. Learn more about the Fore Head here: bit.ly/3eBv7Oz
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So everyone is aware, the rear offset and the forward offset heads are not designed to be spun around. There are three different heads available. The standard Inline head, the Rear offset head (also available on Fall Line series) and the Fall Line R exclusive Forehead (forward offset). The saddle mounts are on different angles for each head to give the maximum adjustment in each scenario. We DO NOT RECOMMEND spinning the offset heads.
Thank you for clarifying.
Awesome product! Innovation like this, while small in design, can be huge in impact! Just for further clarity, I wonder will there maybe be future iterations that are compatible with other common dropper seatpost designs?
My bike is limited to externally routed Seatpost designs so it limits my options in the more modern/recent dropper posts coming to market.
Thanks for sponsoring Hardtail Party and bringing actually innovative products to the market!
I'm digging these short hack videos! I hope we get more of these in the future!
We'll see how popular they become. Sadly, less popular videos hurt the channel rather than help it.
I’ve been hunting for a way to do this with a standard post. The velo seat might be the way to do it. I did a SlackR and it raised the front another 10mm past the already taller ATC fork. I also got an eccentric bb to move the cranks back as far as I can. When people tell me you can’t change a bikes geometry, I laugh..on the inside.
This is great 👍 you constantly mention the STA being to slack or with it was more slack. Great price of ingenuity!!! Great job showing and explaining it!!!
Very interesting product! I love messing with weird little tweaks that can really open a person’s eyes on fitting a bike to their body! Strong work!
Thanks Steve! With this information I was able to change the effective angle of my seat tube on my Pinion geared titanium hardtail. This bike was quite an investment for me, but it was a bit off for my build. I really liked the bike before, but just sliding the seat forward as is "safely" possible (I only ignored the "MAX" line a little bit), I figure that I changed it by about 1.5*, and now I love it as I should've all along. I took it for a ride today with quite a bit of climbing and it was a magical change. I felt like I was over the rear wheel in proper climbing position, the front tire didn't go for wheelies constantly, and I still had energy on the downs, which made it a bomber sled. This shift has re-established this bike as my "forever" bike...thanks again, very useful channel!
Glad to hear it!
This is fantastic, and helped me to figure out the right fit for my mullet conversion I did on my old Trek.
Literally adjusting the seat forward, and slightly downward angled TOTALLY changed the way the bike feels climbing. Great, great videos. Thanks!
This is a company that was never on my radar before your videos. I now run a Slack-r on my Stache and if I ever needed a new dropper this would be at the top of my list. Love that you can adjust saddle angle independently and remove the saddle easily to adjust air pressure. Not sure if they have 200mm droppers though. Not everyone does.
They do have 200mm droppers, with adjustable travel. See the link in bio for their product line.
Nice, I didn't even realize that. Will definitely take a look.
Hmm I was thinking of putting a 27.5 on the front of an old 26er, this would really help in preserving the geo.
Thanks , Im always learning something new on your channel, this subject I’ve never thought about.👍🏼
You should consider the affected distance from the crank\pedals. Sitting too forward or too backward will have a lot of effect on your knees and may result in pain or long term injuries.
Very true . My knees are very sensitive to the location of where my body is in the pedal position . Especially having the seat tube a bit lower while pedaling can create knee pain .So many things to consider with body position on the bike . If your doing some distance flat pedaling you may want a more neutral position for long periods in the saddle .
This is true. But also consider that your effective seat angle is affected by the angle of your terrain. On steep terrain you're seated further behind the bb than on flat terrain. People who live in florida need a very different seat angle than people in the rockies.
Yes, I was thinking about this when I adjusted my seat this week. Also another thing that I realised was that for me, because of the dropper, really the seat angle adjustment is almost always for climbing...so not only did I bring it forward to offset my new mullet, but I levelled it slightly downward because I only bring the seat up on the climbs. (where I live tends to be more up and down, so less flat)
It's made a huge difference just with the seat rails (as I don't have the post)
I ride where it is really steep and notice that my front end would get really light. I would be on the lowest gear and riding a step up causing me to wheelie. I found by dropping my seat slightly would keep my front end down on the climb. This is essentially moving my seating position forward and dropping my center of gravity making a huge difference on the steep climbs. No longer causing me to wheelie. So if you are feeling light up front in a pinch you can drop your seat slightly.
@@mmmotorsports9669 - that's a great idea, I'll have to check this on the weekend becuase I'm heading to our local area in Harcourt Bike Park which has some very steep climbs.
Just did this. Feels a little awkward on the flats but way better on the ups. I guess it’ll just get some getting used to. Thanks.
I have been using the Fall Line R fitted with a forehead to put me in my preferred seating position. Great dropper with great adjustments and smooth action.
Wish OneUp had something like this!
Dude, I swear that’s exactly what I did some months ago. 😅🤙🏼
I even went further and used a seatpost with 20mm offset and mounted it reversed.
That’s why I still don’t bought a dropper post...
Cause they’re always straight.
But NOW that you shown this!
I might buy one in the future.
I moved my saddle farther forward in the rails and it made a ton of difference. Initially my pedal stroke felt much weirder but after a couple of rides I got used to it. Now my front wheel doesn’t lift as much during climbs which I enjoy.
Nice. 9point8 has some great innovative products available. Plus, I like that they are a local company to me.
Really nice design. On my Magura Vyron v2.0, it has a forward saddle mount as standard and is perfect for me on my Chameleon.
So I’ve been conduction my own math refresher course to determine that my XL Karate Monkey has the seat positioned 2.5 inches further back from the BB compared to a small frame. Both have the same 420 mm chain stays. No wonder I have trouble keeping the front wheel down on a steep seated climb! This should help. Looks like my wife is going to get a sweet Fox Transfer dropper... Your timeliness is uncanny!
That is sick, that’s my next dropper for sure
Very clever!
This is exactly what I need. Many, many thanks vor this video!
Be interesting to try this and see how it affects my RA. Steeper STA seem to be more comfortable for me. Product looks like a good idea.
Very cool hack. Were you able to get an Effective SeatTube angle measurement before and after in 'Degrees'?
2.5* slacker or steeper for my seat height.
Just what I need on my Nukeproof Scout. 73 degree unsagged STA at 130mm, but I run a 150mm fork. The frame's a bit long in effective top tube, this offset looks like just the ticket.
Sidenote. I see "effective top tube" is apparently too complicated to fathom and the dumbed down term "seated reach" is being thrown around more and more...
I choose to use appropriate vocabulary in this case. It's a little more work for people to learn the proper words, but it's worth it. Dumbing down terminology is only going to lead to more confusion. If people start using the term "seated reach", more people will confuse it with actual reach.
I think we need another term altogether. When people talk about how shortening your stem or adding an angleset will shorten your "reach", they clearly mean the distance to the bars. Reach has a technical definition based only on the frame geometry but we don't have an equivalent term that accounts for stem length or rise, saddle fore/aft position, or bar rise, sweep or width. So the term reach gets thrown around as a logical but confusing placeholder. We need something like "cockpit length" - the horizontal distance from the centre of seatpost (at top of headtube, same as ETT) to centre of the stem's handlebar clamp would be a decent approximation to at least account for stem length and rise.
@@madscientistmtb2022 agreed
I see you riding this bike since, but you got a riding review for the slackR?
Awesome seriously awesome I have been thinking of this as of lately great vid
Wow. Sweet product!
Does this mess with how the dropper functions? Wear or binding effects?
wow. Sounds like a great new product.
Won't this effect the performance of the dropper by introducing fore or aft loadings into the top bushing ?
Possibly.
Very cool!!
Can you tell us your size? height, inseam? just curious to get an idea of sizing accross the multiple brands you review
I usually mention it in my onboard ride reviews. I'm 5'6" with a 28" inseam.
ok so that's super cool
how do you find the ICAN wheels? Currently building an ICAN p9 with ICAN 35iw carbon wheels
Review coming soon
Hello,
Thank you for this video and information. Interesting stuff !
Is this compatible / usable with any seat tubes ? Or I must get one from 9point8 ?
Thank you in advance
Just 9point8
@@hardtailparty Thank you.
Arf so sad :( I will search another solution
Cool concept. Does it creak at all?
No creaks so far.
was looking back on your bike reviews and saw you really liked ragley bikes, and i was thinking of getting a mmmbop... (in your opinion) do you think the headtube is too slack?
It depends
Which mechanical dropper would you recommend? Thanks
This is my favorite dropper post - the Fall Line R by 9point8
My problem as a very heavy rider is finding a saddle that will stay comfortable after the first hour or so. I've tried many different saddles and none really do it for me. I don't want to put any kind of cruiser style seat on my MTB, that would be ridiculous. Could you imagine seeing some dude on a MTB track or trail with a super wide cruiser seat on a hardtail? Eeeek!
it's not about wide, it just needs to fit your bones in your hip (abdomen?!?) ... second is the material and how much comfort it will create. and often enough I've come to realize that softer doesn't mean more comfortable... I've personally made great experience with the sq lab saddles... it's a german company and the saddles come with elastomeres that will stiffen or soften the saddle just how you need it
I have tried a women's designed saddle and it was very comfortable .
Don't worry about what other people think when they see your saddle, get what works best for you. More cushion may seem softer initially but some saddles are too cushioned and cause more tissue damage due to the soft foam/gel squishing into places you don't want it. I highly recommend going to a s good shop to be fit for a saddle. It's going to take some experimenting, but finding a great saddle is key for this sport.
@@hardtailparty Yeah, that tailbone stinging kind of makes a nice & memorable ride a pain, literally. Now that shops are a bit more open for trade with stock than they were a year ago, I should go and find one with a good rep for customer service.
@@mpk33 if your tailbone hurts it most likely too high in the front, so you don't "sit" on the right spots... sorry, english is not my first language...
those rims!!! how you like them? i need to adjust my seat position because my front end comes up on these steep punchy climbs. i might need to change the whole setup to that too, it looks awesome and very easy to change on trail to actually feel the differences
Wow, im a complete idiot. I just got back into biking and i found my reach was too cramped so hear I am trying to figure out how much longer of a stem I need. Why didn't i just think of moving my seat back!? 😂
Slactacular