Can anyone advise what type of replacement jockey wheel I need for a 10 speed Red rear mech (it's got 11 teeth)? Bonus points if it's a link to a cheap (ish) one!
Thanks
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Location: Oregon Rainforest
you need to match the width (thickness), bearing type, side shape, and then the tooth count.
there's more to it than just tooth count.
the side shapes are usually different between upper and lower rollers... bottom rollers are usually concave, curved sides... upper rollers are usually convex/angular.
and being SRAM anything means they may be proprietary.
this is particularly true with the top end groups.
I know there are SRAM RED owners out there happily running with cheaper jockey wheels, so it must be possible. Unfortunately, SRAM doesn't make it easy to figure out the options.
I would ask SRAM if 10sp Force or Rival jockey wheels will work. If they say you can't because the dimensions are wrong, I would sell the SRAM groupset and fit Shimano instead.
There's a reason I run Shimano on everything.
Location: Parañaque, Philippines
the important part to figure out is the diameter of the dust cap of your current jockey wheel and the number of teeth, if this matches there should be no problem with using after market stuff but generally, manufacturers and companies tend to write down which drivetrain their product is compatible with. Goodluck!