How To Cut A Road Bike Steerer Tube

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How To Cut A Road Bike Steerer Tube

Рет қаралды 275,643

Күн бұрын

Make your road bike look PRO by cutting the steerer tube. This video has the advice you need whether you have a carbon or aluminium steerer.
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If you look at a pro cyclist's bike, you'll see that they always have cut steerer tubes. Let's face it; no-one wants to have a large protrusion above their stem. Only cut your steerer tube if you have settled on your position on the bike!
To fix this, you'll need to cut the steerer tube. It's a daunting job, but provided you have the right tools; a hacksaw and a cutting guide, you'll be able to get that pro look.
GCN's pro tip is to leave enough for a 5mm spacer on top of your stem.
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Пікірлер: 224

@freeagent8225 3 жыл бұрын

I cut mine way too short, get back and arm pain, but would never admit it to my mates. Bike and I look bloody good which is more important

@TundralTV 3 жыл бұрын

So low that you can't remedy it even with a stem. Or is a positive angle stem also not good looking enough?

@freeagent8225 3 жыл бұрын

@@TundralTV My comment is purely silliness, highlighting how important looking like a ' pro ' is to some.

@TundralTV 3 жыл бұрын

@@freeagent8225 I thought it's bit a mix of reality and sarcasm!

@BadmanDNB 3 жыл бұрын

Hahaha

@eamobyrne1 Жыл бұрын

Lol. So true

@dominiquemarantelli53 7 жыл бұрын

another tip: add a thin layer of superglue on the top of the steeringtube after you cut it. it will prevent any possible delaminating of the carbon shaft.

@qwertyazerty2137 6 жыл бұрын

Hey gcn, I just found out that this 'special' blade for carbon is actually an ordinary blade for cutting ceramic materials. Both are made of wolfram steel and the cutting edge is layered with diamond particles. So if it says it's for carbon specifically, you just pay evem 5x more just for the name.

@Metuchen 7 жыл бұрын

for cutting alloy steerer tubes, a tubing cutter works superbly... it makes a clean, square cut every time without needing to clamp it down or anything like that. Tubing cutters can be found in the plumbing section of any home improvement store

@jas2819 Жыл бұрын

....or a suitably sized Jubilee clip as a cutting guide. 🤗🤗

@stepanbmw Жыл бұрын

Man, thanks for the idea. Appreciate it

@iamspecialised 7 жыл бұрын

Thank you so much for talking about the star nut. Dan didn't mention it in the last video GCN did on cutting a steerer tube.

@silaseul3186 7 жыл бұрын

you should have mentioned that you are not allowed to put any pressure on the saw, especially when working with carbon forks, as it might result in a carbon string ripping out, which will render your fork useless

@deusexaethera 5 жыл бұрын

The likelihood of this happening is nearly zero. If carbon threads actually come loose from the binding resin while you're cutting, then there is something very wrong with the manufacture of your fork stem, and you should throw it away before it fails in the middle of a ride.

@TheoreticalCyclist 7 жыл бұрын

I use simple pipe cutter to do this with my alu tubes.

@fastk9dad 7 жыл бұрын

Instead of the special tool to hammer down the star nut, you can also use a socket that is the same size as the inner diameter of the steerer tube. Much better "bodge" than hammering the bolt.

@littlewhitestormy 7 жыл бұрын

but don't ever file downward on a carbon steerer like that, as the individual carbon threads can be pulled down and unbraid. only go upwards.

@deusexaethera 5 жыл бұрын

Hypothetically yes, but the likelihood of that actually happening is nearly zero. If the carbon fibers are so loosely-bound in the resin that they can pull loose so easily, there is something very wrong with the manufacture of your fork, and you should throw it away before it fails in the middle of a ride.

@ChristopherDowning 4 жыл бұрын

Don't drag the file down like that...you can cause the problem you are trying to fix....just run the file upwards only. AND who put that hacksaw blade in the wrong way round. This is what happens when you get presenters to do engineering jobs....its like Blue Peter on a bad day!!!

@pondskater8178 4 ай бұрын

@@ChristopherDowningglad you mentioned it!

@deusexaethera 5 жыл бұрын

Instead of using a file to finish the edge, use a sanding sponge. Press the end of the steertube into the surface of the sanding sponge, and twist. It will perfectly clean the cut edge with no fuss.

@kidsafe 9 ай бұрын

He took so much material off that he created a chamfered edge... Crazy. For anyone watching this, you just want to sand off any little burrs and leave the edges intact.

@ericrobert5296 7 ай бұрын

The chamfered edge is beautiful though.

@wilianamaral 7 жыл бұрын

+GlobalCyclingNetwork the "thing" on the blade used for cutting carbon is called tungsten carbide. There are more expensive options coated with diamond carbide as well.

@mrbluejohn9 7 жыл бұрын

Just putting it out there that with aluminum steerer tubes, theres a metal tube cutter that are available in local homedepot or tool shops, that does the job perfectly fine without needing a saw... I've done it with the tool and it does a fine job!

@Kevro3108 Жыл бұрын

I can't find any reference to this in the comments, although it may be there. Adding 2mm to the cut line is ok as long as the top cap has enough space. The compression sleeve can easily be 2mm resulting in 4mm of 'protrusion'. That only gives you 1mm of space with a 5mm spacer. I have usually therefore cut at the original cut line when cutting carbon steerer tubes. That gives you the 3mm you need.

@joystation1 7 жыл бұрын

If you've got one, secure a jubilee clip on the fork steerer tube just below your cut line, if you've got two jubilee clips put one either side of the cut line, you could even use a couple of zip ties above and below the cut line if you cut carefully.

@jeffa.7298 5 жыл бұрын

I just used me teeth, didn't even get off the bike.

@xmb9972 3 жыл бұрын

Just make sure you do it with old teeth (preferrably english teeth) because you cant damage the enamel finish any worse than it already is.

@jakbain1337 7 жыл бұрын

If you have a compression sleeve at 4:05 due to how it expands and with there being a rather large support at either end, you are probably going to strip your threads in a head stem before crushing a steerer tube. Even if you go for the flush look.

@sardendibs 3 жыл бұрын

A couple of tips after just doing this on a carbon tube: 1. No need for a guide. I used two stainless steel hose clamps - one on each side of where I wanted to cut, about a mm apart, tightened around the steerer tube. 2. Removing and reinstalling the fork on a bike with internal cable routing and hydraulic disc brakes would take forever and involve bleeding the brakes. No need. You can cut the steerer tube "in situ". Just lay the bike down on its side. 3. I didn't like the thought of using a file on the cut tube. Used some P40 sandpaper instead. Worked well. 4. Tube cut with a 32TPI blade. Worked well. Clean cut with no fraying. No need for a carbon blade.

@DeepakKumar-lv4te 3 жыл бұрын

a short tungsten carbide "blade" or "rod" is less than £2 at toolstation. Used for ceramics/tiles etc.

@tobortine 7 жыл бұрын

I thought a star fangled nut was an overly patriotic American ?

@stevo22222 7 жыл бұрын

tobortine wheeeeyyyyyyyyy!

@derbersdiscoveries5938 6 жыл бұрын

Im American and that's funny 🤗 loosen up

@kris.monroe 4 жыл бұрын

Ha! That's pretty funny. XD

@icejunki 4 жыл бұрын

Not bad, not bad at all. Haha.

@BlueSteel101 7 жыл бұрын

The blade you need is a tungsten carbide blade, the same type used for cutting tiles.

@ryant75 2 жыл бұрын

I've cut many of my carbon steerer tubes with jus a dirty hacksaw blade and then sand down the inside and outside edges. Never had an issue. Definitely measure multiple times before cutting 🤪 and don't forget to service the headset bearings during the process

@mediumrick7667 7 жыл бұрын

Please do a video on the steer tube stretcher.

@wibblemania 7 жыл бұрын

Rather than spend the money on a guide, I just tape two spacers either side of the cutting line and that gives you a perfectly straight guide to cut against.

@deusexaethera 5 жыл бұрын

Good idea.

@angelaguilar1549 4 жыл бұрын

wibblemania FACTS

@icejunki 4 жыл бұрын

Thank you

@brianwoods551 7 жыл бұрын

@gcn carbide grit tile saw blade 😀

@conorgilligan2056 7 жыл бұрын

Pro tip: Carbon specific saw blades are quite expensive. You can buy a tile cutting blade for less than half the cost which is essentially the same thing as a carbon blade.

@Methodical2 5 жыл бұрын

Parks Tools carbide blade is only $8.

@MrGarnet108 2 жыл бұрын

So clear instructions, thanks.

@the23rdshadowdragon 7 жыл бұрын

I am a schoolboy racer, I have been lowering my stem every month or so until I have slammed it. I have one spacer to go. The. I have the decision, to cut my steer tube. Which, whilst I'm still growing (hopefully) I am not sure if this is a good idea or not? Any ideas, GCN or experienced riders welcome. 😃 Thanks in advanced

@someguy9520 6 жыл бұрын

Or you could use ur stem and imply put a thin spacer above it. Spacers are cheap, even if they get scratched just flip the scratched side down and you can still use it

@literoadie3502 7 жыл бұрын

Search for Raoul Luescher and his channel ''Luescher Teknik'' if you wanna learn about carbon.

@cup_and_cone 7 жыл бұрын

If you don't want to mess with a starfangled nut, you can still use a compression plug in aluminum steerers.

@werdsmyth 7 жыл бұрын

Ah...literally just asked that question. Should have scrolled down! Thanks.

@drsus0 2 жыл бұрын

Si might be the only dude that can get away with that much vocal fry

@Prestonelmer 2 жыл бұрын

I used my index finger as a saw guide. Worked well.

@drillodarryl 7 жыл бұрын

Haven't had much practice with a file have you, Simon?

@MrKevin8432 7 жыл бұрын

I love these workshop-videos!! Keep it up! :-)

@andrewferguson640 7 жыл бұрын

I used a pipe cutter. Job done in just a few turns.

@werdsmyth 7 жыл бұрын

Question: Could you/should you use a compression sleeve instead of a star nut in an alloy steerer? I feel like the added grip afforded by a compression sleeve would be a bonus, regardless of the material used in the steerer.

@gcn 7 жыл бұрын

yep, we've done it before and it works.

@kris.monroe 4 жыл бұрын

I am just finishing a fun bike build and totally forgot the star-fangled not! (felt like a dingus).. Great video!

@jboogy2920 2 жыл бұрын

I wish there videos showing the conversion from a short threaded tube with quill stem to a new longer fork which shows the details as far as wedges, nuts, spacers. Etc.

@sergarlantyrell7847 7 жыл бұрын

"You should also wear a mask" then proceeds to not wear a mask. Set a good example Simon!

@SiRushBass 5 жыл бұрын

tbf you couldn't actually see his face during the cutting

@graphics_dev5918 4 жыл бұрын

@@SiRushBass Not for long, but you definitely could: kzfaq.info/get/bejne/o7tdfJCCyZzMc6s.html

@icejunki 4 жыл бұрын

@@SiRushBass ............"to be fair" -Letterkenny

@Alan-75 4 жыл бұрын

A mask! Why not use rubber gloves, goggles, pads and boiler suit too, just to be a full on pansy.. You might get something in your eye, knock some body part against something hard or get dirt/oil on your clothes.

@sergarlantyrell7847 4 жыл бұрын

@@Alan-75 omg, you're so right... Respirators ARE just for pansies! I bet you're so tough you don't even wear one when dealing with loose asbestos.

@icejunki 4 жыл бұрын

I have always said, "No one likes an unsightly protrusion", it's reassuring to hear you agree.

@gcn 4 жыл бұрын

Unsightly protrusions are not very aesthetic

@icejunki 4 жыл бұрын

@@gcn love you guys, such a great channel. Makes being an avid cyclist just some much more enjoyable. Cheers.

@palmer3977 7 жыл бұрын

I remember the good old days when you could adjust the handlebars & stem up & down as many times as you wanted just by using a Alan key.

@Melino9999 7 жыл бұрын

palmer3977 still possible duh

@turbojigger 3 жыл бұрын

I just tape old spacer as my cutting line guide. 20mm will be straight enough. Too thin will wiggle around

@SkeetSystem 7 жыл бұрын

Third time he says "now there is a risk" I said fuck it, I'm definitely taking it to a shop

@mihpop9733 7 жыл бұрын

If you don't trust yourself, or you don't have the skills take it to someone who does, even as an engineer i sometimes o that.

@SinnerSince1962 4 жыл бұрын

I can't even imagine trying to ride at that seat/bar angle. Crazy....

@johnbailey2266 7 жыл бұрын

Star FANGLED nut? I believe that's star-flanged, a nut with a star-shaped FLANGE:^)

@robwilson5947 7 жыл бұрын

I have just cut my unsightly protrusion off!

@molliekintyre5468 6 жыл бұрын

This is why I have never seen the attraction of the Ahead stem system. A quil stem is so simple to adjust to any height required, and can be done at the roadside if necessary - even a girlie-girl like me can do it! There is no cutting in a workshop, no need for special no-good-for-anything-else tools, no toxic dust and no bother. And a quil stem is neater and more elegant. Will someone please tell me if I am wrong...

@DeepakKumar-lv4te 3 жыл бұрын

annoyingly had to replace my road bike fork so moved to a threadless carbon one from a threaded steel one. The big issue I have is the dumb ugly ass stem, unlike my wonderfully elegant & slender alloy quill stem. And I just know with threadless I'm always going to be wondering if I've got the headset bearings pre-tensioned properly - and if they're not then it'll cut rings into the carbon steerer which then has to be thrown away! Now I have to strip off my handlebars of all its furniture just to get them out of the quill stem too. It's gonna be a shock for those bits since they've spent their entire life there! I also had to source a 1" threadless headset for the conversion from threaded, which was not easy. Fortunately I found a Tange nice and cheap at Condor Cycles but it wasn't easy since no one touches 1" anymore. Does this make me a girlie-boy ??

@Eicles 7 жыл бұрын

That's a Tungsten Carbide grit hacksaw blade in case you wanted to know Si :-)

@cyclejockey4397 7 жыл бұрын

Thanks for the tips guys !

@reu13 7 жыл бұрын

I've Never cut carbon fiber on a bike, but I have for model aircraft. When ever I do though, I rub a thin layer of carbon fiber epoxy resin, or Cyanoacrylate to help protect the cut or filed areas. Sounds like it would make since to do that here too. Any thoughts?

@MarshWaha 5 жыл бұрын

Hi Reuben! Not to be the Grammer police here or anything but your last sentence " Sounds like it would make since to do that here too." I think what you meant was sense not since. Just want to point that out.

@deusexaethera 5 жыл бұрын

Yes, it makes sense to seal the cut edge with CA glue -- not to prevent fraying (the binding resin can do that on its own), but to prevent water from soaking in and potentially de-laminating the carbon fibers over the years and decades to come.

@deusexaethera 5 жыл бұрын

@@MarshWaha: *GRAMMAR* police, not grammer police.

@MarshWaha 5 жыл бұрын

Shawn Elliott 🤣🤣🤣

@julianlim8692 2 жыл бұрын

Yup it works

@DonToye 4 жыл бұрын

Instead of using an old stem as a guide use a simple hose clamp. Much easier to get a hold of if one doesn't have a stem lying around.

@lukasgeukens4822 7 жыл бұрын

Note, when you file you should only file in the direction away from the tube so you don't start demamination...

@Julien423 10 ай бұрын

Very instructive. Thx!

@barefeg 7 жыл бұрын

if the expander is correctly installed there shouldn't be a problem with putting the cap flush on the stem.

@guntherschultz912 4 жыл бұрын

I will only substruct 3mm even with that protruding expander?

@TGRacing 7 жыл бұрын

Use the whole saw blade Si!

@zorro48705 5 жыл бұрын

Cristal clear as an unmuddy lake.

@janplexy 3 жыл бұрын

I wouldn't recommend filing the carbon steerer tube with the back-forward motion.

@woozertoo 7 жыл бұрын

7:15--DJ Si putting down some old-Skool vinyl scratching.

@jeffsewell7046 7 жыл бұрын

#torqueback. You should team up with the slow mo guys to do tech videos. Slow mo if a derailleur working would be cool. You could show difference between good shifting techniques versus shifting under load.

@1afterthep 2 ай бұрын

my bike as three 1cm spacers and I want to remove two of them, so I cut 2cm off, no need for those extra 3mm, right?

@allesrelativ 4 жыл бұрын

The saw guide should be sg-8, thats the right one for carbon saw blades. The sg-6 is for aluminium/smaller blades.

@WillEyedOney 7 жыл бұрын

Does the hacksaw blade have to be in backwards or will it work the correct way round too? :)

@twatts4436 7 жыл бұрын

WillEyedOney what do you mean by barcwards? the 'back' of the triangle will be towards you.

@WillEyedOney 7 жыл бұрын

The teeth were facing backwards, the arrow was pointing towards the handle.

@twatts4436 7 жыл бұрын

WillEyedOney sorry, didn't spot the arrow. It will cut if in the wrong way, but not as well. Pulling pulls the blade down towards you and into the material, pushing takes more effort to do the same thing (and is less controlled). so the teeth should always be at the back.

@literoadie3502 7 жыл бұрын

NO! Hacksaws are meant to cut on the PUSH (most saws for that matter) but some people like to flip the blade for personal preference. Literally 99% of the time the hacksaw blade will be set for cutting on the push, i.e. the vertical side of the triangle (the tooth face) facing AWAY from you.

@colnagoc50HP 7 жыл бұрын

Doesn't matter with a carbide grit saw blade like Simon used to make the cut.

@pawekwas8815 Жыл бұрын

Torque of expander insert?

@jasonmrenfro 7 жыл бұрын

isn't this kind of a rerun? I swear I've already seen them do this.

@snerual2010 7 жыл бұрын

this one is more well informed though.

@everlysuniquetimbersawshop 7 жыл бұрын

Unsightly protrusion....I got the joke. Haha - Si's mini pump.

@JustADudeWithAnUnnecessaryName 7 жыл бұрын

Instructions not clear enough. Accidentally dropped my car up stairs.

@AutodromoF1 7 жыл бұрын

When filling carbon fiber I think you file in the same direction as the strands, not against them.

@alic4788 7 жыл бұрын

Please please align the FSA branding on the headset. Either in line or square to the stem, just not skew whiff how you've left it now. ta.

@deusexaethera 5 жыл бұрын

Yeah, that's definitely the important part. _[rolls eyes]_

@pauls5745 3 жыл бұрын

my roadbike has a threaded steerer, I know it's an ancient frame but I'd like to cut my threaded steerer down from some similar but equally antique forks

@AlpinestarsR6 7 жыл бұрын

Get that bike reviewed asap! I assume its your new steed?

@mylescockburn7464 7 жыл бұрын

I adjust my stem by undoing the allen bolt at the top, moving it up or down, and tightening the allen bolt. Quill stems rock. What is this "carbon" that you speak of? Sounds crude and ungainly.... (but I do agree that no one wants to see an unsightly protrusion...like Dan).

@PJCC_BAISH Жыл бұрын

I thought poeple in this channel know alot better than any other else on cutting an aluminum tube.. I just laughed hard at him cutting it with a hacksaw... This explains about none of them had thought of an aluminum pipe cutter which cuts an aluminum tube evenly and precisely without worrying that you might cut them unparalleled. 😂

@randellgribben9772 Жыл бұрын

wrap the post in tape.. for a cleaner cut

@thanhnguyen4908 5 жыл бұрын

thanks

@VaqueroVegano 5 жыл бұрын

What if the road bike steerer tube is made out of steel can I still chop it off🔥

@alfmoore7606 7 жыл бұрын

That's nice

@underzepump2905 7 жыл бұрын

"Use an old stem..." *pulls out $200 carbon stem*

@johnobrien5464 7 жыл бұрын

If you are cutting carbon then you definitely want to be wearing a mask and probably set up a vacuum cleaner up to suck away the dust as you cut. You do not want that going into your lungs

@frederikroark 6 жыл бұрын

That vacuum might actually disperse the dust into the air even more, though. Probably better to just hold your breath when in the vicinity and open the windows...

@deusexaethera 5 жыл бұрын

The risk to someone who isn't working with the stuff on a daily basis is essentially zero. First of all, the carbon fiber is bound in resin, and the resin continues to coat the microscopic carbon shards released while you're cutting, so it's essentially no different from any other kind of dust. Second, mesothelioma requires daily exposure to friable fibers for years and years. Third, you live in Europe, right? That means you're breathing carbon dust from diesel cars every time you step outside, and you haven't died yet.

@leroy_who 2 жыл бұрын

Just wet it whilst cutting. No dust. Done.

@guigamoretto Жыл бұрын

This bike was really easy to assemble kzfaq.infoUgkxMesz3KOGEmwmvyKQfLfrRSUXLFzfVHZA and required very few adjustments out of the box. The wheels did not require any truing/adjustments. The frame had some small scratches, but nothing major.I did replace the seat though - the seat it came with was very uncomfortable. The tires need to be re-inflated every 4-5 days, but this appears to be quite common for the narrow 700x25 tires.Overall, in my opinion, this bike looks and rides like a much more expensive bike.

@SLJeans 7 жыл бұрын

Why not use a pipe cutter? I’ve used one on all my bikes since i was a kid using my dad’s tools. Depending on the material being cut, it’s faster and cleaner than using a hacksaw

@gcn 7 жыл бұрын

agree, on steel/alloy steerers they are fantastic.

@jesuisFORTIO 7 жыл бұрын

Never cut mines, makes selling the bike much easyer, and i always have to sell old bikes if want another one :c

@hernendezsanchez7646 4 жыл бұрын

Not setting your bike up to suit you is like not having sex with your significant other to keep them in good nick for the next bloke 😅

@charlesmansplaining 7 жыл бұрын

Compression plugs in a carbon steer tube must be aligned directly under the location where the stem will be clamped so that when the stem is torqued down there is that added support and you won't crack the carbon steer tube. The plug serves a dual purpose and is not just used to preload the stack.

@TimothyFish 7 жыл бұрын

Why a hacksaw instead of a pipe cutter?

@Bublephart 7 жыл бұрын

Timothy Fish I'm late to the party but... a pipe cutter has the potential to compress the tube, deforming the cut.

@chrisblanchard4938 5 жыл бұрын

Is the added space on top necessary with an aluminum steer tube as well or just a carbon steer tube?

@thanhnguyen4908 5 жыл бұрын

hi i have 2 pinarrelo F10 and my size about 5'6.5 tall.how i can measuring my arms and my back so i can know for sure closed headset length so i can cut it to make it's close fit what ever i can.......can u help me thanks??

@colbyperry3325 7 жыл бұрын

Oh say does that star fangled

@guntherschultz912 5 жыл бұрын

Is it normal for a carbon fork steerer to chafe when installing a stem?

@bikeanddogtripsvirtualcycling 7 жыл бұрын

I will be ordering the parts for my new bike soon. I have decided on the scott addict frameset, Enve 4.5 ses wheels with chris king hubs and red bar tape. i was hoping to get your opinion on groupset though, si. I like the look of the Rotor Uno hydraulic system but dont know whether i should just play safe and go for Di2. i know you did a couple of reviews a few months ago on the rotor uno, si, and wonder if they are as great as you made them seem. cheers.

@infidelgastro 7 жыл бұрын

You're not putting an 'edge' on the steerer tube with a file after cutting it Si, you're putting either a chamfer or a bevel on it.

@Flinches 7 жыл бұрын

What would the difference between a race bike that isn't slammed and an endurance bike that is be? How similar would a slammed endurance bike be to a race bike?

@jonathanzappala 7 жыл бұрын

+Calum Neill it depends on the size of course for comparison, giant for example has the same top tube sizes across TCR and Defy, but propel is slightly bigger. A full rise TCR (race) will overlap with a slammed Defy (endurance) in the same size. The TCR will still have a longer reach if you keep the same stem. You could never get the max height on a TCR that you could on a defy, but with +17 deg stem you can get a lot of height if you want, same with a -17 on a slammed defy you can get way low. You can also get a smaller size frame for endurance and a longer stem and achieve the same position as a race bike.