I recently replaced my rear derailleur as the barrel adjuster on my old one had stripped and was stopping me from being able to index my gears properly. Unfortunately, I seem to be getting a weird rattling noise when I'm in my three largest sprockets since I fitted the new one. It's shifting fine and I don't think it's an indexing problem as the noise doesn't seem to be coming from the chain rubbing on the sprockets.
I set it up using the Park Tool book as my guide so I've done my H and L limit screws and adjusted the B screw so the derailleur should be sitting in the correct position.
Anyone got any ideas of what to try next? It's a SRAM Force mech, if that helps. Thanks
It is according to Park Tools. The mech is sitting 6mm below the biggest sprocket. TBH this is the first time I've fitted a rear mech that's needed any adjustment so it may well be wrong!
Top three are one unit. The lock nut is tightened to torque but there does seem to be a little play in the cassette. I do have another rear wheel with a different cassette on it so I might try it with that one and see what happens.
I'll try that later, if the problem still happens with a different cassette. I do have a Powerlink on the chain to remove it but this is my last Powerlink (except my emergency one) so I'll leave that as a last resort.
About 3 years old. Think it's probably done about 3000 miles. Can't find my chain checker (think we may have lent it to someone) so can't check the wear on it.
I'm unsure of the age of the cassette, I got it free when I bought some second hand wheels from someone from this forum.
In reply to climbingpixie:
worn jockey wheels should be obvious by comparing with new ones, so prob not that.
is your new RD same model as the one you replaced?
a pic might be helpful (largest sprocket-side on)
