what jockey wheels with what derailleur?

[Titiritero]

I've searched the forum with no success, apologies if the answer is already hidden somewhere. As the title says, I am looking for jockey wheels. As part of the bounty when picking up a bike a few weeks ago, the guy took the chance to empty his cellar and gave me a box full of spare parts (the proverbial "parts bin" but in cardboard format). It had at least 2 XT derailleurs (M730), a DX, and a couple modern Deore. The XT are both missing the jockey wheels and the bolts, and the DX could do with new ones.

But I'm lost with the options. Are the ones sold as "for 6-7-8 speed" the correct ones? Or it does not matter? I've noticed some have 10 teeth, other 11, is this important? Any recommendation regarding the bolts for those wheels?

Thanks for the help!

 

[ishaw]

I think you'll want 10t jockeys for the older mechs. 11t for newer (8, 9 and 10sp iirc).

I've got some new Shimano 10t jockeys doing nothing at the moment.