New cassette & chain rattling in middle gears?

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nmfeb70

Senior Member
Location
Tonypandy, Wales
Hi All, I've just replaced a worn cassette & chain (see previous post) but the bike still makes a noise in the middle gears. The new cassette is a fixed unit (apart from the two smallest sprockets), so there should be no unevenness between the middle sprockets. I've lubricated the new chain & cleaned the rear derailleur, so I'm thinking it's either a case of adjusting the B Screw on the rear mech, or the front chain wheel - which I haven't replaced in over 2000 miles - is worn? Any suggestions? Many Thanks.
 
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