New cassette & chain rattling in middle gears?

[faster]

The OP would need a spacer if this 9sp cassette was being fitted onto an 11sp freehub (it isn't).

How can you tell? Maybe the OP has mentioned it somewhere? Skimmed through, but couldn't spot it.

 

[ColinJ]

The OP would need a spacer if this 9sp cassette was being fitted onto an 11sp freehub (it isn't).

And it is a mountain bike freehub anyway...

IIRC, 11sp road freehubs are 1.8mm longer than 9sp road freehubs, which is why the spacer would be needed if using a 9sp cassette on an 11sp freehub.

I think that mountain bike freehubs are all the shorter size so spacers are not needed. This is possible because 11+sp mountain bike cassettes are offset inwards to fit in the same space as 10-sp.

 

[fossyant]

I was checking, it's been known to happen (missing spacers/MTB/ROAD hubs).

 

[cyberknight]

I have known a new chain to need indexing if the old chain was stretched enough , as mentioned above the chain shifting under load when riding can be slightly different to on the stand .

 

[I like Skol]

Is it threaded through the derailleur correctly? You wouldn't be the first person to go the wrong side of the little cage tab that lives almost hidden between the jockey wheels.

 

[ColinJ]

Is it threaded through the derailleur correctly? You wouldn't be the first person to go the wrong side of the little cage tab that lives almost hidden between the jockey wheels.

Pah, in many years working on my bikes I haven't done that once...!

 

[Deleted member 89023]

One other point, you've not forgotten the spacer, and the cassette is tight and not wobbling.

I've checked the cassette from all angles & everything is flush.

 

[Deleted member 89023]

Is it threaded through the derailleur correctly? You wouldn't be the first person to go the wrong side of the little cage tab that lives almost hidden between the jockey wheels.

I've made that mistake before & learned from it.

 

[Deleted member 89023]

One other point, you've not forgotten the spacer, and the cassette is tight and not wobbling.

Ok, so sprockets 1-7 are fixed together. Sprockets 8&9 have a thin protruding rim/lip which faces inwards and act as spacers. (as @ColinJ has mentioned). The problem sprockets - 4&5 - are fixed together.

 

[CXRAndy]

Replacing a cassette can easily alter the indexing. Same as taking a wheel off then back on. I had to index my mates bike after a puncture repair. Only needed a fraction of a mm to stop clicking

 

[I like Skol]

Replacing a cassette can easily alter the indexing. Same as taking a wheel off then back on. I had to index my mates bike after a puncture repair. Only needed a fraction of a mm to stop clicking

I'd have reseated the wheel personally...

 

[Deleted member 89023]

Update: The problem was the chainring. It soon started rattling and clicking in all gears on the large ring, yet stayed silent on the small ring which I rarely, if ever use.
Unfortunately the chainring on Deore/CUES are riveted rather than bolted on, so I had to buy a new crank but at least everything is now silent.
Excuse me for feeling a little sense of achievement, but thanks to this forum & a few YouTube videos I've now replaced the entire transmission system on my Trek MTB as well as saving myself a few quid. Happy cycling.