How To Cut And Install A New Bike Fork | Fitting A Mountain Bike Fork At Home
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- Äas pĆidĂĄn 14. 06. 2024
- Fitting a new pair of forks to your mountain bike can be one of the best upgrades for a bike. It's also necessary to remove and install forks for servicing. In this video, Doddy shows you how to properly cut the steerer tube and fit them at home! đ§
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Pro-tip for those like me who can't afford Park Tools: I use an old stem as my saw guide.
I mean it's not even critical anyway, as long as it's close by eye
You're a genius man, thanks for this
You are genius!!!!!
how in the fuck did I not think of that
or newish stem and a fat washer on the saw side
When you pull the fork out of the saw guide make sure you immediately turn the fork upside down as you're pulling it out rather than standing it up straight. If you stand up straight, all the metal filings that are inside the steer tube will fall out the bottom of the steer tube and quite possibly land on top of your stanchion seals
Clever
Or just don't panic about the filings, and blow in off with an airline đ€·ââïž
@@russelltaylor1500 The world has gone into complete panic mode with everything these days..pathetic world we live in.
Somebody gives a handy wee hack to avoid a bit of extra hassle and some others see it as "panic". Projection in action. For what it's worth I'm sure many like myself appreciate the tip.
@@russelltaylor1500 I literally just got done filing the steerer tube on my new Rockshox fork, got filings all over the stanchions, and just blew them off, lol. No biggie. Those stanchions get crap all over them when riding, dust, mud, dirt, gravel, sand a couple tiny metal filings ain't gonna hurt them.
Because of videos like this I've been able to build my own aggressive hardtail from scratch
Very educational
Thanks GMBN tech
My hack method to install a star nut is to use an EMTY co2 cylinder with a piece of masking tape for depth. It's the perfect diameter and the shape of the base perfect for centralizing the nut.
Great vid. To help with the metal filings, pop the packaging plastic bag back on the forks before you cut and file away
Scratching the fork or crown race is not, "damage."
I've always used a flathead screwdriver, sure it scratches up the fork, but it's not damaged. Nobody ever looks down there anyway.
25,000 miles since 2009 and no issues. I also installed star nuts with a block and hammer, before Sam Pilgrim was CZcams famous.
Made a headset press for $10 at the hardware store with a long bolt and various washers and lugs.
Great video. Very thorough. I like the simple explanations and the fact that it allows how you can do this with the tools you've probably got already or ones you can get hold of relatively easily, as well as the technically correct way of doing things. Kudos.
Funnily enough yesterday i watched the verision of replacing forks from 2 years ago.
Are you Dr who
@@hollownexus9316 Nope, just a coincidence
Was it different?
@@rupedog Very slightly, pretty much the same.
Hey Doddy, I used an older video of yours recently before fitting some forks and used a bag to stop swarf getting on the stanchions. #GMBNTech - One tip I have is that youâll get swarf in the steerer tube when you cut it so I recommend inverting the fork to clean it out once youâve cut it. Keep up the good work.
I needed this december! But I managed to sort it out by going back to some of your previous videos as well as the one by Park Tool.
Big thanks for this quality guide!
Thank you for the video,you explained all about it and why . Also emphasized the problems that may happen. Without being condercending .
Covered everything, great work.
Clear and concise đ Thanks so much
Excellent video man. I appreciate the very helpful tips.
Already know how but just love watching a good bit #GMBNtech cheers doddy
Superb video mate! Incredibly detailed and sorted. Good on ya!
Right on bro brah, got my forks cut right on the money and assembled.
Thanks for the heads up!
I worked in 2 pro shops back in the 90's, never seen a proper crown removal tool. Learn something new all the timeđ Also I've noticed over the years vise is at the end of bench nxt/over a trash can. Helps with the mess.
Just got new forks and I need to put crown in any help ?
@@chicagodrill3705 take to pro shop. Haven't worked on bikes in yrs. I build cars now
Great videos as usual !!! Keep going !! Right on time i will replace my fork in few weeks just waiting for the fork. Would be great if you put a list with links for differents tools in the description.
Here I am watching GMBN tech at 2 in the morning. Videos are great
Yikes!
And I thought I could just order in a fork and slip it right on O_o
Wow, that's definitely cooled down my jets
U said it man
I just got a delivery of a new fork yesterday :). Good advice with not pressing the pipe cutter too hard. I did that with my handlebars and the brakes were a pita to get back on.
Just in time. I will have to do this, soon. I hoped to discover a new method for driving in the star nut without the workshop tool but yours is as good as mine. I like to place the Fork on a pice of wood with the crown for the job so it does not compress.
Ok so you just convinced me to use my bike shop
Thanks for the video
At 7:46 you say the steerer should sit below the stem. I've always been told it should be above the stem so that all of the stem clamp can then clamp against the steerer tube giving a more secure fit & also the top of the stem then won't get compressed narrower than the steerer. When the steerer is above the stem as I suggest, an appropriate stem spacer should then be added on top to give you that approx 3mm gap between top cap & fork steerer to allow take up of slack.
Quality video!
I am going to try old vacuum pipe for installing the race.
What a great video
Great video BTW
After using the pipe cutter remeber to sand it down on a nice fresh curb.
i remember changing new fork. removing the crown race from old fork steerer without proper tool was ultimate pain. spent so many hours using cutter blade to fit in the gap.
Helpful video, quick question. What torque should the caliper screws be screwed down with to the fork?
class vid as usual doddy shame it wasnt made for when i installed my new airbike fork
When you put the saw guide on how do you know where your cut line mark is once itâs in the clamp?
Put your crown race in the oven on 250 c, it will expand slightly so it's really easy to put on. I always give a few taps with a wooden block and a hammer (make sure to alternate sides every tap and it will be on there with little effort). Just watch you don't burn your fingers.
Make a crown race installation tool from poly pipe and a poly pipe straight connector, which fits 1 1/8 steerer crowns perfectly. Never use a bearing or hit the race directly
I use a length of plastic waste pipe to fit the bottom bearing race. Cheap, but good.
To remove crown race, tap in the sharp edge of a stanley knife (utility knife) blade, all the way around to lift it, then it pops off easily with some leverage from, ideally, plastic tyre lever.
No risk of travel
I installed a shorter Stem the other day on my gf's MTB and was quite shocked when lowering the forks to see Ballbearings sitting in their ring. I guess her "cheaper" components use an older style of fitting. I wouldnt mind seeing a video on servicing/greasing tbis area of steering. The only other steering I've pulled apart were old Malvern Star brands with Full Length Goose Neck Bolts.
Good vid
Hi GMBN! Is it normal for a new fork to have a little play when pushing down even if the lockout is in the lock position?
I just did this, and it works well. however, I have one little problem. I moved the crown race from my old fork to my new, but the bearings don't seem to sink on it. Are there different models of crown race rings?
Can You give a few examples of headsets with open lower race crown? I've checked Ritchey, FSA, Cane Creek wich are my go to brands and I couldn't find any headsets which would not require eploying mallet/puller.
Thank You
Is it possible to change offset/rake of fork...letâs say I wanna expand my wheelbase a bit? Would lowering the offset work? ...and yes I wanna change geometry of my bike đ I just wanna know if itâs possible without destroying the fork (the fork will be more expensive than my bike) đ
fyi, the crown race isn't a bearing surface. The bearings are sealed inside their own cartridge. The cartridge or bearing housing is what seats on the crown race. Still best not to damage it of course but a small scuff wouldn't matter as much as if it was an actual bearing sitting directly on it.
Typically how much is the tensile torque (Nm) for headset expansion when installed in to the aluminum tube fork? Thanks,,
I disagree fundamentally with cutting the steerer tube below the stem top. I donât think itâs wise to apply clamp force over and above the end of the tube, especially where a carbon tube is concerned. Measure above so that a 5-10mm spacer can be used while providing the proper space for the top cap to create bearing preload.
How is that different from measuring to a few mm short of the top of the stem *with all spacers in place*. You seem to be saying cut it to as long as the stem then add a spacer? Same difference?
@@wood42shed A little longer than the stem, with at least a 5mm spacer on that for the bearing preload. With a inner steerer expander sleeve right at the top that will provide to the top of the tube as well.
With triple clamps don't forget the top crown.. almost made that mistake. I like to leave an extra spacers worth on top of the stem just because you may want to move resell your fork to a different bike and if you do forget that triple crown can save your arse lol.
I also ovalled a fork once with a pipe cutter. I'd cut many forks that way, this time I must of been impatient wasn't by much but the stem didn't slide on smoothly.
How far in does the star but go? Do you just match your old forks??
Great video, however I'm slightly confused why @8:56 you had marked and cut the steerer at 214mm instead of the 210mm you had measured off your previous forks steerer tube.
I guess because he wants to add a 5mm spacer and/or needs Just a bit more space to tighten the topcap.
i was wondering the same thing! That aint 210
He marked the tube at 214mm after the dry fit (the top of the spacer), then has to subtract 3-4mm for the actual cut line - which results in 210mm where the actual cut is.
That is a completely different fork with silver steerer tube he is marking at 7:31 with the mark at 214mm. it showed him marking 214mm at 9:16 on the original fork with black steerer tube and saying that is the cut line and make sure you don't make a second mark. There was no mark at 210mm for the black steerer tube. He gets the point across but the above comments are valid and should be addressed by author.
Is there any reason not to cut a slit in a solid crown race [with a Dremel for example] to make it a split version - to aid future removal? - as long as the headset uses cartridge style bearings of course.
DODDY
Make a Video of Steerer Tube Replacement !!!
Some Steerer Tubes you Can Press Out
Ask your manufacturer.
Does your fork have to be cut a tad bit below your stem so your top cap doesnât hit your fork. So that your top cap can be tightened up to tighten your headset up?
I bought a star nut installer....just to check the nut installed previously was right....ÂŁ10 well spentđ
Lmao....
A useless tool.
I want to change the sunfour xcr forks on a carrera to something better.. any direct replacement suggestions? Not the whole bike lol just the forks.
Installing a starnut, I fit a screwdriver through the hole and just give it a good set of wacks. Works like a charm.
You put a screwdriver in the hole where the threads are? That's bad advice.
Better to knock it in with a piece of wood and mallet and wooden dowel or at least something with a larger circumference than a screwdriver, and not stick something into the hole where the threads are.
@@dangerous8333 You put the screwdriver through the hole, not touching the threads. The plastic screwdriver handle sits flush on the star nut, not touching the steer tube sides.
Hey Doddy what kind of watch is that?
is it suposed to have those crumbs in there ( 8:24 ) Doddy?
*DODDY* what was the name of the 'how to' tricks guy in mbuk late 90s early 2000s rode an orange Santa Cruz chameleon..đ€đź
9:50 is he rotating the cutter the right way (and does it matter)?
I always have trouble getting my forks to sit flush when I put them back on. I usually have this problem when I change the stem. It's like pulling teeth to get it to sit flush. Any tips?
the m5 bolt comes in a few different lengths... at a guess the 12 mm???
How is that 2021 Fox 34 fork? I read it is not good. Especially the FIT4. I have read the 34 fork is "harsh" and "suck across the board" unless it is Grip2. Is this true? Anyone?
I am about to replace fork on electric bike as it came with bent fork.. and it looks about the same
Beyond me I'm afraid. What rough cost should it be at a bike shop (UK 2023), Thanks.
Cleaned my cut up on the steerer lovely using an orbital sander
Does this bike come with reflectors?
Do people still use an azonic headlock?
#askgmbntech why is it that not all crown races come with a split, it seems to make everything much easier? Is it okay to cut a split yourself? Also, why aren't they an integral part of the fork or fitted from the factory?
So... how much extra spacers should I have? You said "required amount of stem spacers." IDK what that is. Help.
Best to cut steerer tube on mitre saw lol :D
Light Saber
If you replace your crown race do it with a split crown race. Itâs a simple solution.
Hi dodgy. Iâve been thinking about buying a new bike. One of the components I have been considering is the sram axs shifter system. But the bikes that come with them fitted and REALLY expensive. If I buy a bike with a shimano groups set fitted, can I just buy the sram shifter and the derailer and fit it to the bike. Will it work?
No presenter at gmbn will tell you to mix sram and Shimano, but if it is 12sp, it works perfect, and actually you get the best from both worlds, electronic shifting without cables, and hyper glide+ for shifting under load.
Would've been good to add in what decides how many spacers under/above the headset in a video like this as well, because it directly affects where your cut need to be.
do it like pilgrimđđ
Confused which technique to use to cut down forks - This one or the Sam Pil angle grinder technique? đ€Ł
@@RealMTBAddict So bolt cutters to cut it. I got that part. But a welding torch? To what, put it back together?
Grip the stem in a vice real tight, slide a solid bar into the stem .. don't forget to mark the bar for depth and apply ample force back and forth until the tube breaks off at the perforation points đđ
Instead of using a flat screwdriver to pry the race off, use a chisel. The tip is much thinner and easier to put between the race and the fork.
can you answer to this comment with a link that i can buy the cheapest good air suspension fork? please
If you have a Scott you will need a T25 for your top cap and stem not a 4mm Allen bolt despite appearances.
must be windy where hes biking :D
What forks need is another standard...maybe large taper with triple bearing on euro and imperial casings..oh and an upside down version that changes every six months.
If thereâs a chance of damaging your fork getting the crown race off just buy a new crown race, theyâre probably cheaper than taking it to some shops to get it removed
Good point!
Hey Doddy, I did as you said and used my fingers to feel for an edge after filing. Though I ended up cutting myself.
Could I have avoided this with Kashima coated steerer tubes?
Also how do I add more blinker fluid in my bike lights?
Thanks
So the how to learning to cutand in #GMBNTech the installe the new forck a the my home of thes so #GMBN #MoutainBiking session's day thanks guy. Doddy. Saluds of chile đšđ±đ€ đ đ€ đ”
I have just thrown a trash bag over bottom of forks and some painters tape then once cut blow off with compressed air and/or soft brush I suppose then there is no chance at all to get metal on the seals or shafts and chances are you will need the trash bag immediately in the shop anyway lol
So when I changed out my fork and put my new one in. It made a rattling noise which was the fork. I looked at it and it was loose. But the star nut was in the fork. So what do I do?
If you can't figure this out, you should really take it to a bike shop and have them do it.
This is really easy, perhaps you aren't mechanically inclined. That's fine, not everyone who rides a mountain bike can work on their own stuff.
@@dangerous8333 Ya I already did it. I figured it out and it's pretty easy.
Is the RockShox revelation a good fork?
Yes it is, 35 mm stantions, a later damper upgrade, and youâw got a pike ultimateđ
It went together easily in less than an hour. czcams.com/users/postUgkxHL1v1R3NE5x4KiYfyt8dnQmyNYz7qi5L Make sure the front fork is forward or the pedals will hit the front tire. Tires are both a little soft so it needs air before I ride it. The rear wheel didn't come with a clamp regular bolts hold it on. The front had the clamp. No scratches out of box. Rims are a little off with a slight wobble. They could have spent more time with the spoke tool fixing the run out. So far out of the box I'm happy with it. I did replace the pedals with a nice aftermarket set. After riding it a bit my A$$ is a bit sore so I ordered another seat. Overall I'm nearly 60 and didn't ride a bike in 30 years. I like my new 29" Schwinn. It will be used for casual rides with my friend.
Hi
At 7:01 he shows us that it measures 26 cm & he says that measures 21 cm. eh?
210mm or did you mean 215mm?
@@R-Dub-Ya maybe he means 215 but is cutting at 210 (for the top cap compression space) but I certainly didnât see the 210 final scratch mark and besides Iâm pretty sure Doddy was using the old fork measurement which would negate what Iâve just said lol
super nice video, the special tools neede, aint that expensive compared to the price the bikeshop will set u back for mounting it. And you can alway sel it when u are done. !!
Insert a flared headset cup remover though the stem and insert it into the head tube to hold the handlebars on the bike, or just buy the ridiculous Park Tool dummy fork!
Since crown races are universally needed and appear standard - wonder why forks just donât come with them pre-installed, and donât ever need to take them off (eg why even bother taking it off an old fork - as youâd need it on the old one anyways if youâre ever going to use it)
Wrap your new fork in a bin bag before cutting the tube, hopefully will prevent all metal shavings from getting near the stanchions!
How to fit a fork? Fork has two legs, if you can motivate it to run regularly, it will get fit for sure. Good luck getting your forks fit guys! :-)
@sampilgrim should watch this đđ
Iâve never found a pipe cutter thatâs good enough
Ice toolz sell a decent one
Any decent new one made for copper pipes will do.
great info, thanks for the tips. For someone who has such an eye for detail and is always conscious about how his bikes look, I gotta say those green GE 1's look completely out of place. It seems like the whole GMBN crew is using those green grips now! The oil slick lock on tabs are tight but there is a limited amount of frame colors/ accents that green goes with..... imo. Love the content. Not a hater!