Ok this might not be possible but does anyone know whether its possible to face the mounting surfaces of the rotor mount points on a hub? I have a slight 'wobble' in my rear rotor that causes an annoying amount of drag. I have tried three different rotors all straight and new and it was no better, i have aligned and realigned my calipers without effect, its always the same point on the rotor that rubs. I have created spacers that reduce the effect but don't eliminate it and are only a temporary solution. Can this be sorted?
There's no workshop tool for it, even aligning it on a lathe could be tricky.
Why not send the hub back.
A quick skim on a lathe would sort it. tricky to find a lathe that would take a built up wheel tho but possible
what spacers are you using???
http://www.chainreactioncycles.com/Models.aspx?ModelID=356
0.25mm shims would surely be thin enough that you could sort any tolerance out.
but it sounds like your hub is not right
piece of cake to get a hub centred in a lathe, a wheel though - bit more specialist!
Hmm, Im trying to think of some kind of improvised cutting tool you could use to skim the mounting face with the wheel spinning on an upside down bike whilst you mate spins the pedels. 😆
Cleaver use of a dremel and a few clamps to the chainstay may just do the trick. Top bodging. 😀
You do seem to be assuming that new rotors will be straight- more often than not I've found them to need a little fettling, after all they usually come with very little packaging so even if they leave the factory perfect, there's a good chance they take a knock before they arrive...
Same prob here on old secondjand wheel. Used those shims you use on is mounting brskes till it was ok. Took bit fiddling but got there in end.
I'd be 1. Looking for my adjustable spanner then 2. Getting on with life.
People seem more and more to be treating bikes as NASA level precision instruments.
As Al said.
Are they avid rotors? I have had issues with umpteen avid rotors from crc they tweak as soon as you tighten them up. get some nice superstar ones..
If i was going to do it i would mount the wheel on my big milling machine and interpolate round the bolt mount face. It would take an age to setup properly. Have you tried clocking up the face to see what the runout is?
also, are you sure your wheel bearings are ok?
Wheel bearings are fine, spins endlessly with no brake. i've checked the rotors on another hub and they were straight. Those shims look like my best option, I have been using home made ones made out of PTFE sheet but those hope ones look great.
just because it spins well doesnt mean there isnt play, which would make the disk rub. Have you checked for play? rock the wheel holding it top and bottom.
another check is to mark the disk (and by implication mark the hub) where you think the high spots are with an eyeliner or chinagraph pencil. Change discs see if it happens in the same place..
I would be looking at the bearings too - are they in right? Tight/secure enough?