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Old 04-08-13, 05:43 PM   #1
Ttime
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Fork Rubbing bottom of Headtube

Hi,

I was replacing a tapered fork on a Trek madone 5.2 from 2012 and ran into some issues. The fork I am replacing it with is a Columbus Grammy (also tapered, similar rake).

Anyways, the issue is that there doesn't seem to be enough clearance between the fork and headtube to allow proper preloading. So when I go to adjust my headset, the fork starts rubbing on the lip around the headtube before the play is gone in the headset.

So I guess my question (maybe I should have asked this before getting a new fork) is if not all tapered forks are compatible? Is there a spacer I can use on my lower race to create more stack so that the rubbing is gone? Would a different headset solve it? The headset thats on it was the one it came stock with which is some kind of FSA.


Thanks
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Old 04-08-13, 05:55 PM   #2
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Was there a "crown race" on the old fork that you neglected to transfer?
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Old 04-08-13, 06:16 PM   #3
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No there was no crown race on the previous fork. If I put a 1.5" crown on the new fork, would this fix the issue and create enough space to tighten down the headset?
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Old 04-08-13, 07:47 PM   #4
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Originally Posted by Ttime View Post
No there was no crown race on the previous fork. If I put a 1.5" crown on the new fork, would this fix the issue and create enough space to tighten down the headset?
Perhaps the old fork had a built up seat at the steerer base to act as a "crown race" (I put crown race in quotes because cartridge bearing headsets only have a support plate, not a real race.) and the new one doesn't so you need to install whatever came with the headset.
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Old 04-08-13, 07:54 PM   #5
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most carbon forks i have used are designed to carry a crown race. a misnomer really in that the ball bearings don't touch it directly, but it does create a little extra space between the bottom cartridge bearing and the fork proper.

and IME, forks don't come new with a crown race. it's usually part of the headset.

my latest build; a raw frame w/out headset or fork made it necessary to buy a used carbon fork. it had a crown race on it that was very difficult to see. the new headset came with a race too. the crown race that came with the used fork didn't work with the new headset, so i removed it and installed the crown race that came with the new headset. there are many opportunities to make an error here.

Last edited by hueyhoolihan; 04-08-13 at 07:58 PM.
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Old 04-08-13, 08:02 PM   #6
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. the crown race that came with the used fork didn't work with the new headset, so i removed it and installed the crown race that came with the new headset. there are many opportunities to make an error here.
+1 Crown races or base plates are almost always specific to the particular make and model of headset and always come with them.
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Old 04-09-13, 12:28 PM   #7
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If everything is in order but the frame and fork still don't want to play, the solution would probably be to face the bottom the head tube a tad.
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