Talk to me about stiffening up a flexy steerer tube

Discuss light weight issues concerning road bikes & parts.
winky
Posts: 84
Joined: Sun Feb 10, 2013 5:11 pm

by winky

No way is the steerer tube flexing. Fork blades maybe. Not steerer tube.

Privateer
Posts: 383
Joined: Thu Feb 03, 2011 2:28 pm

by Privateer

Steerers can be flexy. I had a light carbon steerer on my Lefty that flexed so much that it felt like the headset was constantly loose. I switched it for a different one (also carbon) and the problem was immediately resolved.

User avatar
dwaharvey
Posts: 493
Joined: Thu Oct 26, 2006 8:54 pm
Location: USA

by dwaharvey

@Privateer: out of curiousity, what carbon steerer did you find flexy and what did you replace it with (and find stiffer)?

FastforaSlowGuy
Posts: 85
Joined: Fri Dec 30, 2011 10:02 pm

by FastforaSlowGuy

The fork is stock on my Museeuw MC-2 (http://en.museeuw.com/bikes/race/mc-2). I'm not saying the "test" I did was scientific in any way. I can't imagine what kind of situation I would find myself in where the front wheel is trapped in place and I needed to twist the bars. I've also noticed bar movement when I get out of the saddle on the trainer, so something is flexing. The fork legs may be the more likely culprit. In any event, I can only report that when I perform the same "tests" on my MC-2 and my Team Carbon, there is less movement with the latter.
__________
Seven 622 SLX
Colnago C50 Extreme Power
Zanconato CX

User avatar
dwaharvey
Posts: 493
Joined: Thu Oct 26, 2006 8:54 pm
Location: USA

by dwaharvey

Given that the diameter of the legs is much larger than the steerer, I don't see why some people think it must be the fork legs. I once swapped a cheap Trek carbon fork with an alloy steerer for a Look full carbon fork and there was a massive difference in stiffness that I think was definitely attributable to the steerer tube change. Not that this helps you do anything about it of course, other than removing spacers and /or changing the fork.

kulivontot
Posts: 1170
Joined: Sun May 16, 2010 7:28 pm

by kulivontot

Whether its the fork blades or the steerer, what does it matter? The fork itself is still flexy. It could be the headtube too, but the bottom line is that the frame or fork has to be swapped.

winky
Posts: 84
Joined: Sun Feb 10, 2013 5:11 pm

by winky

Seriously. I thought I was talking to a bunch of weight weenies. Nope, I must've missed the renaming of this website to stiff weenies.

eric
Posts: 2196
Joined: Tue Nov 11, 2003 9:47 pm
Location: Santa Cruz, California, USA
Contact:

by eric

In the Olde Days race mechanics would drive a broomstick down the steerer tubes of bikes to be ridden in Paris-Roubaix to reduce steerer breakage.

You could expoxy an appropriate sized carbon or aluminium tube in there, as was suggested above.

FastforaSlowGuy
Posts: 85
Joined: Fri Dec 30, 2011 10:02 pm

by FastforaSlowGuy

All interesting ideas, but none seem (a) worthwhile or (b) appropriately WW. I think I'll live with it and take this as a license to ditch my bulky compression plug in favor of something lightweight.
__________
Seven 622 SLX
Colnago C50 Extreme Power
Zanconato CX

Privateer
Posts: 383
Joined: Thu Feb 03, 2011 2:28 pm

by Privateer

dwaharvey wrote:@Privateer: out of curiousity, what carbon steerer did you find flexy and what did you replace it with (and find stiffer)?


It was a Hellore. I replaced it with a Black Cat Bone.

Post Reply
  • Similar Topics
    Replies
    Views
    Last post