This is a 2013 Trek Superfly AL and has served me well for a long time, haha. The rub has knowingly been ignored now for over a year, I really do not know when it started. Has it been rubbing ever since I installed this Trail 245 Torch 32h Wheelset or has something worn out?
There is no more adjustment at the caliper to Shimano SH-MA-R180P/S adapter connection. I was thinking of just doing some grinding on the adapter but am thinking maybe it's a bent rear triangle? Or something missing or needing adjustment at the connection point of the triangle at the back there near the axle. Maybe some washer or something? The rotor is true so its not that.
Any ideas?
by lordmaxiam
10 Comments
The caliper looks bent
If caliper is true, try the setting method, when you lose all caliper mounting bolts, spin up the tire and rapidly press the brakes. Don’t release the brake lever till you tight up all the mounting bolts.
I use this method every time I remove/work on brakes and it sets is correct every time.
From the photos I really can’t see anything necessarily wrong to cause that.
I’m curious though, what happens when you loosen the rear azle?
Readjust the Pad Adjustment screw. This will re-enter the brake pads.
You could get the IS mount on the frame faced, and take off a little material there. Probably a bike shop job as the tools are/were pricy.
Should also sort any alignment issues with the calliper, as long as the mount is straight
Since this issue has developed after you installed the new wheelset, I suspect the new rear hub is a bit wider or off center than the previous one. I’ve seen this rotor misalignment between wheelsets before, but I was lucky enough to just needing to realign my caliper slightly, which was possible in my case.
See if a different, 1-piece rotor will fix the rubbing, or start grinding something that will provide more clearance.
My guess would be something is bent or worn out or wrong spacers for the hub.
I am assuming the rotor is pretty true?
Are the ADP bearings still good? I had a 2017 Trek fuel that I had ADP bearings wear out that caused some goofy issues but not this. Do you still have the old rear wheel to compare?
You need a washer in between the rotor and the frame on the axel.
Check that both pistons are moving. Sometimes you’ll get a sticky piston and one side tends to push out more. I’ve had this happen and cause the caliper to rub before.
There’s videos on YouTube on how to clean the pistons. It’s pretty straightforward.
Clean the piston surfaces with rubbing alcohol and push them back in after.
Same thing happened to me last week.