Slow downshifts?

[ishaw]

Things were working fine prior to a change in wheels and cassette. Cassette was an 11sp xt, but new wheels run an XD driver so it's now sorting an xo 11sp XD cassette.

Chain was new a few rides before the wheel and cassette swap ( had issues with the freehub and wheels were odd anyway, hence the swap to some race face aeffect I bought off here).

It works fine on the upshift to larger cogs but is slow to drop a cog.

I must admit I didn't check the tooth count on the new cassette, old was 48t to 11.

Could it simply be down to chain tension due to smaller cog count (which I haven't confirmed yet, but suspect there's a few teeth less). It's possible the cables have for stiff as the bikes been ridden in the wet, but as it was fine before the swap, I'm not convinced that's it.

 

[klunkrider]

Cables and b tension would first ports of call.

If the new cassette is smaller then the mech might be sitting too far away so babbling b tension screw out may help.

 

[elite504]

^^
Occasionally the inner strands start pulling through the ferrule on the gear outer, and dragging on the inner wire. Pop the cable out of the stops and take a look. Only real solution is replacement, but if you're desperate and have outers long enough, you could trim half an inch from each end, and cable it back up again.

 

[pictonroad]

Is it a SRAM mech? They're brilliant but incredibly fussy about set up. It's not like the 'do it by eye' shimano kit, you need to follow the (always excellent) on line guide and get all the measurements spot on.

 

[ishaw]

It's an xt rear mech and shifter which were shifting fine before the wheel and cassette swap, nothing else has been touched.

I'll check the b limit screw but things looked ok to me.

I may as well swap the cables, I was going to do that anyway as a full tear down was on the cards, just wanted to sort the wheel out for the half term, hadn't expected to need to do anything else.

 

[Tootyred]

One click looser on the cable tensioner ...... will let it drop faster. Just to point out the obvious, prior to a total rebuild! I

 

[ishaw]

Rest assured I've done that, it's still dropping slowly even after a few turns on the adjuster, which then if course messes with the upshift.

 

[Tootyred]

I did have that on derailleur where the spring was a bit stretched..but on kit that new, it doesn't sound that likely. It just wasn't pulling itself back down hard enough.