I'm fixing up a friend's bike and the teeth on the jockey wheels on the Deore mech are worn out. I have a pair of good condition Shimano jockey wheels that are the same radius but about 2mm wider at the centre, plus I have fixing bolts that are long enough to hold them securely.
Will it be OK to swap them? I know that I will have to adjust the movement on the mech. It's an 8 speed cassette.
Are you sure that your replacement Jockey pulley isn't really a tension pulley? The Shimano Jockey pulleys are marked "Centron" or something and are deliberately narrower to be able to "float" to allow for indexing. If you install the non floating type of Jockey pulley, you may have misalignment, with indexing shift levers, with some of the cogs. The jockey pulley's hub is usually the same width as a non floating type of pulley.
Last edited by elcraft; 07-19-14 at 06:41 AM.
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additional to this is that the different gear counts (5,6,7,8,9,10,11) use different width pulleys. While there is some possible interchangeability getting the right pulleys is a best practice. Andy.