I have a 2010 PX with Edge/Enve fork and TRP EuroX carbon brakes. I have a terrible shimmy/shudder from the fork on hard braking. My shop has tightened the headset, front hub, toed-in, toed-out, filed down pads with no success. Any ideas? Different/better brakes?
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This topic has been covered in great detail by Lennard Zinn over at Velonews.com, so I won't get into why it happens, but you can eliminate the chatter by going to a fork crown mounted hanger like this one available from TRP.
http://www.trpbrakes.com/category.php?productid=1096&catid=188
Shortening that distance from the brake housing stop to the cable yoke will eliminate the problem. Only issue is if your fork is pre-drilled for a hanger.
Posted 1 year ago # -
cincytri,
Yes, you are getting the chatter due to the fact that the fork flexes first under braking, then pulls on the brake cable and produces even more pull on the pads. This is compounded by running low tire pressures, which adds to the amount of grip the front tire is getting on the ground. De-tuning the front brake is a good starting point....pad toe, clean rim surface and gentle hand pressure will help but not eliminate the issue.In the Zinn article one solution is going to a mini-V brake model of brake that will eliminate the hanger under the stem. Another way to go is to replace the fork with a stouter one, or one that has a crown mounted brake stop. Both of these are features on the new Moots CX fork. We are due to have them on the site within a couple of weeks and be able to offer them for sale.
I have run a traditional canti for my 20 years of racing and riding Cyclocross bike and really don't encounter chatter that much. When my pads are new there is some, or if I've gotten glue on the braking surface.... but once then "run in" it goes away. I prefer the wide canti for its simplicity, mud clearance and well, I'm just old school. I'm of the thought that brakes on a cross bike are for scrubbing speed, not skidding. We don't get a ton of mud in Colorado, but when we do it's the clay type and I like the clearance the wide canti offers.
Let us know how it goes.
Thanks,
Jon@Moots
Posted 1 year ago # -
cincytri
MemberWell, that new cross fork would fit the bill perfectly. I'd like to use cantis and there is just nothing out there in terms of Moots-worthy cross forks with the crown mounted hanger. I'm in for one when they are available. How much and can you put me at the top of the waiting list? Is this the same fork that comes with the PX RSL? I'll be putting my deposit on that frameset in April...
Posted 1 year ago # -
davehybb
MemberHi,
Here is another option. I have a carbon cable hanger which Focus were supplying on all their top end Crossers.
I was having the same problems and despite several bike shops trying to solve the problem, it was reduced but never eliminated.
It was so bad i was considering selling the bike. Many crossers have said it is a common problem and difficult to eliminate.Since this hanger has been fitted, plus the remarks above about setup (toe in, slightly higher straddle etc) i have absolutely no problems with judder at all, and the modulation is great. There is enough power to easily raise the back end and it comes oh so smooth.
The only people i know do them are Focus bikes so maybe you could try the importer? Our importer was very helpful (I am in the UK).
It was a guy at Speedgoat cycles who put me onto the idea and have never looked back.Not sure how to post pictures so i have sent a picture to Jon at Moots maybe you could put it up Jon?
Dave.
Posted 1 year ago #
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