Join Date: Aug 2005
Location: Hudson Valley, NY
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Originally Posted by joejack951
If it fits and spins smoothly, it'll work fine. I forget Shimano's marketing fluff for why they added teeth to the pulleys on some deraillers but I doubt it makes any real difference.
+1 As long as it spins freely and doesn't cause the chain to rub on the derailleur cage you should be OK. (It will reduce your derailleur's capacity a little.) I'm perplexed, though, as to why the Shimano replacement pulley doesn't fit. Unless I'm mistaken, Shimano has manufactured Acera derailleurs in both 7-speed and 8-speed. I'm not sure what the difference is, but it's possible, I suppose, that they have different width cages and pulleys. Jenson lists pulleys for both, so you might contact them and see if they can clear things up for you.
Edit: IIRC, the pulleys on the Acera are different sizes. The guide pulley is 13t and the tension pulley is 15t. Is it possible that they've gotten mixed up somehow?
Last edited by strock; 08-20-11 at 07:21 PM.