Join Date: May 2004
Location: Southern California
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I have the Hayes Nines and I had to shim my rear caliper to give me more room to center it on the rotor. I wish the oval mounting holes on the callipers were longer. I think what's causing this is a "stack up of tolerances" - too many interfaces in the system that need to add up to a certain dimension in order to maintain the proper ISO specified dimension.
What also helps is to use a credit card to help adjust the pads and caliper.
1. Essentially start new by removing the calipers, pads and pushing the pistons all the way in (see Hayes' caution and don't push on the posts that secure the pad's spring clips.)
2. Install pads, loosely attach the caliper, and secure wheel (there should be lots of clearance).
3. Place an old credit card or plastic hotel room key or a couple of business cards between the pads and rotor. Then squeeze the lever and tighten the caliper mounting bolts (this will help center the caliper). Squeeze the levers a few more times (holding the credit card spacer so they don't drop out) and this should adjust the pad distance. And you're done.
(You may have to experiment a little. For example, I find that I need to use the spacer on the inner pad, but not the outer).
As sheba said you need to adjust them a bit and find that sweet spot. Once done, the caliper/pad system will be matched to the bike/rotor.