Go Back  Bike Forums > Bike Forums > Cyclocross and Gravelbiking (Recreational)
Reload this Page >

Front Fork Judder/Chatter under braking - My Solution

Cyclocross and Gravelbiking (Recreational) This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like : "Unbound Gravel". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

Front Fork Judder/Chatter under braking - My Solution

Old 09-13-11, 09:13 PM
Senior Member
Thread Starter
canflyboy's Avatar
Join Date: Aug 2008
Posts: 204
Likes: 0
Liked 0 Times in 0 Posts
Front Fork Judder/Chatter under braking - My Solution

A started a thread a week ago mentioning my fork juddering under braking. Here's the story so far.

My cross build started with a Blus CXC frame with TRP cantilevers. Standard cable hangar from the top of the headset. First test ride, the front fork immediatly juddered. I set the brakes with about 1mm toe in. I changed the used pads for a new set and the juddering seemed to go away. Wrong! That only last for a very short time.

Upon further investigation, I noticed that there was play in my head set. This play was not coming from the inside diameter (ID) but from the bearing outside diameter (OD) and the bearing pocket in the headset. This is where the top and bottom bearings of the headset sit in the bike frame's head tube. Upon dis-assembly, I noticed both top and bottom bearing pockets had play. To fix this, I took a center punch and hammer and punched the aluminum inner diameter of the bearing pocket. I made punch marks all the way around the bearing pocket, about 3mm apart. These pock marks, when made with a center punch pushes metal "out" and makes the bearing pocket diameter slightly smaller. I then re-installed the upper and lower bearings with red loctite and re-assembled the fork.

The fork felt tighter on the stand already. My next move was too change my "toe in" to "toe out" on the canti's. I did a google search and responses were all over the map on whether to "toe in" or "toe out". Since I started with 1mm of "toe in", I decided to try "toe out".

Went for a ride and to my disappointment I still had judder. It was getting late, so I had to leave it for the night, but I was all prepared to go to mini v brakes of even a new fork.

Next day, for fun and as a last resort, I rest the brakes to about 2mm of "toe in". To my surprise - NO JUDDER. Not only that, the brakes work exceptionally well. I've tried everything to get them to judder and they're smooth as silk. Go figure.

"Toe in" BTW is with the front of the pads closest to the rim. "Toe Out", the rear of the pad is closest to the rim.

I think my original problem was a combination of loose bearing pockets compounded with not enought "toe in".

Looking forward to my first race.

canflyboy is offline  
Related Topics
Thread Starter
Last Post
Papa Tom
Bicycle Mechanics
09-19-18 02:28 PM
Bicycle Mechanics
09-19-16 09:21 PM
Bicycle Mechanics
04-12-13 05:53 PM
Classic & Vintage
08-28-12 08:57 AM
Bicycle Mechanics
05-26-10 10:18 AM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Your Privacy Choices -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.