Retrobike Forum Index

It is currently Tue Sep 29, 2020 4:04 pm

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 10 posts ] 
Author Message
 Post subject: Cutting a carbon steerer
PostPosted: Thu Jul 16, 2020 12:23 am 
Gold Trader
Gold Trader
User avatar

Joined: Fri Jan 23, 2009 2:30 pm
Posts: 16703
Location: Surrey
I need to trim a new rockshox carbon steerer. Its a new old stock sid works cup, so I don't want to make a mess of it, nor do I want to cut it too short if I decide to move it on to another frame in future.

What's the best way to cut it?

How much extra would you leave on it, just in case?

I don't mind running spacers above the stem as long as it doesn't look too fugly.


Top
 Profile  
 
PostPosted: Thu Jul 16, 2020 9:55 am 
Retro Guru
User avatar

Joined: Thu Jun 23, 2011 11:25 pm
Posts: 2659
Location: It's not easy being a dolphin.
I've used a hacksaw with a deliberately blunt blade to cut carbon steerers without issue.


Top
 Profile  
 
 Post subject: Re:
PostPosted: Thu Jul 16, 2020 10:21 am 
Retro Guru
User avatar

Joined: Tue Nov 04, 2008 12:00 pm
Posts: 905
Location: YORKSHIRE!!
ive used the park carbon saw blade to great success.. (on handlebars)

plenty of water on the area whilst cutting to contain the dust.. a dust mask.. and something underneath that can be chucked straight in the bin to catch the dust.. (carbon dust is evil stuff!) nice long gentle strokes.. it cuts much easier than metal..

i turn the bars and cut all the way round now.. if you go straight through.. you can be left with a really uneven cut at the end where the tube essentially just breaks and falls off.. that being said.. its really easy to file it straight afterwards.. but remember to contain the dust somehow!

the spacers above the stem thing is just to ensure the stem is 100% in contact with the steerer to help spread the load.. cut it just right and you could get away with just a 1/2mm spacer above the stem if your topcap allows it..


Top
 Profile  
 
 Post subject: Re:
PostPosted: Thu Jul 16, 2020 1:00 pm 
Gold Trader
Gold Trader
User avatar

Joined: Fri Jan 23, 2009 2:30 pm
Posts: 16703
Location: Surrey
Thanks so far. About the steerer length, as mentioned I want yo leave enough to allow flexibility if I want to move to other frames with different head tube lengths. How to determine this is my challenge. Leaving extra with spacers above the steerer, how much is too much/aesthetically ugly?


Top
 Profile  
 
 Post subject: Re: Re:
PostPosted: Thu Jul 16, 2020 8:06 pm 
Retro Guru
User avatar

Joined: Thu Jun 23, 2011 11:25 pm
Posts: 2659
Location: It's not easy being a dolphin.
ishaw wrote:
Thanks so far. About the steerer length, as mentioned I want yo leave enough to allow flexibility if I want to move to other frames with different head tube lengths. How to determine this is my challenge. Leaving extra with spacers above the steerer, how much is too much/aesthetically ugly?


...it's everyone's challenge. :wink:

I would say one 5mm spacer above the stem is acceptable, anything more, it's ugly.

You can play around with stems that have a high stack height vs. a low stack height too so you don't cut the steerer
too short. Kore and early Easton for example have a high stack height.


Top
 Profile  
 
 Post subject: Re:
PostPosted: Fri Jul 17, 2020 1:05 am 
Gold Trader
Gold Trader
User avatar

Joined: Fri Jan 23, 2009 2:30 pm
Posts: 16703
Location: Surrey
stem will be a Thompson for current build. Future, no idea.


Top
 Profile  
 
 Post subject: Re:
PostPosted: Fri Jul 17, 2020 9:22 pm 
Devout Dirtbag

Joined: Wed Feb 05, 2020 3:04 pm
Posts: 106
https://m.youtube.com/watch?v=EWzN6GZeEzs

Proper technique.


Top
 Profile  
 
PostPosted: Mon Aug 03, 2020 3:31 pm 
retrobike rider
retrobike rider
User avatar

Joined: Tue Jan 29, 2008 11:04 pm
Posts: 2562
Location: A wretched hive of scum and villainy...
On carbon, I alwasy use a tungsten carbide grit hacksaw blade, light abrasive 200 grit paper to get rid of any snaggy bits (technical term :-)), and then seal the cut end with clear varnish to prevent water ingress into the open fibre ends.

All the best,


Last edited by danson67 on Thu Aug 20, 2020 9:07 am, edited 1 time in total.

Top
 Profile  
 
 Post subject: Re:
PostPosted: Thu Aug 20, 2020 8:23 am 
Retro Guru

Joined: Mon Mar 28, 2016 11:02 pm
Posts: 273
Location: Edinburgh, Scotland
As above, but I also tape up the steerer where I cut just in case the carbon weave tries to unravel. Then once it's done remove the tape bandage and admire the smooth clean cut.


Top
 Profile  
 
 Post subject: Re:
PostPosted: Fri Aug 21, 2020 6:47 pm 
Retro Guru

Joined: Sun Apr 25, 2010 10:07 pm
Posts: 2328
Put some tape over the cut and use a fine tooth junior hacksaw.One thing to keep in mind is carbon fibre dust is lethal so wear a dust mask and disposable gloves and try to cut over a bin so none of the stuff remains on the floor.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 10 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: ovlov440 and 19 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group