Bicycle Mechanics - rear wheel, chainstay seriously bumming me out
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07-27-02, 06:56 PM
If I don't cinch down the rear QR as tight as I can, the rear wheel will drift into the left chainstay before I can even clip in. I know I'm not suppose to be tightening the QR that much either, but if I do, it will behave itself. The wheel isn't terribly out of true, and I don't think anything's out of whack on the frame either. I can line up the wheel perfectly in between the stays, lock it down with the QR, but as soon as I go it drifts on me.
Additionally, now even when it doesn't contact the stay, I feel like the wheel is "dragging" itself on something: slowing itself down. I guess I feel like there's a little friction still, but not sure of the source.
Help me :(
Is the axel too long and sticking out beyond the drpout?Did you mess with the hub and maybe put the outer locknut on wrong? You are using a skewer that gets a good grip and not some POS. Could the skewer be at fault
07-27-02, 07:27 PM
road bike or mountain bike.. road bikes have two screws that you can use to adjust the "centerness" of the wheel. The axle may be shot though (thats just a guess)
07-27-02, 07:37 PM
Are the dropouts vertical or horizontal ?
07-27-02, 08:08 PM
road bike, horizontal dropouts, mavic wheelset, with mavic QR. I got this excerpt from a site:
"With horizontal dropouts, it is possible to mis-align the wheel in the frame if it is installed carelessly. The axle nuts or quick-release must be tightened quite securely, or the chain tension may pull the axle askew."
This is what's happening, I'm almost certain. It is possible then that I need to tighten the quick release very tightly? I remember reading somewhere that excessive tension could cause damage.
EDIT: when I secure the wheel, I can center it just right, but as soon as I get going, I believe the chain tension is causing the wheel to twist. The problem does go away when the QR is very tight - is this necessary?
07-27-02, 08:12 PM
like i said.. maybe the skewer or something on it is shot
07-27-02, 08:25 PM
Put the wheel in without a skewer and make sure the axle does not extend beyond the dropouts.
A QR skewer should be tight enough, but you dont need to force it. Have you used them before ? For my first QRs I got the bike shop to show me how much force is required.
You may have a skewer that is not getting a good enough grip.Mavic skewers work ok on my semiverticals,but have not tried them on horizontal.Rule of thumb is to use palm pressure and have the lever make a good impresion on the palm when closing.
07-28-02, 01:59 AM
Also, if the axle has done this a few times (sounds like it has), it's possible that it's worn a groove that helps it slip. My old Fuji had that unfortunate problem after I yanked the rear wheel forward on the drive side a few times, and I ended up having a framebuilder buddy stick some vertical dropouts on it. Some locknuts with fresh, sharp teeth and good skewers may be enough... good luck. :)
What you could try is some BMX chain tensioner's. They work great.
07-30-02, 12:29 AM
Check the alignment of your dropouts, theyr'e probably not parallel to each other. It does take some special tools.
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