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markymarkw1

New Member
Hello, lm in need of some help regarding a change of chain cassette and wheels. I have a Boardman with 105 10 speed 25-12 with a kmc chain.
Decided to change the chain and cassette for another kmc chain and 105 10 speed 25-11. Also got some new aksium wheels. The wheels come with a spacer for 10 speed that goes on before the cassette, but my old aksium didn't have this. The new cassette also has one that goes behind, the same as the old cassette. I put all the new stuff on but the chain doesn't sit correct on the smallest sprocket and slips. I've adjusted the derailleur but it's still doing it. I tried taking off the spacer that came with the cassette but it's still going it. Could it be chain link number? I counted the same amount out before splitting it (105 links)... But as I have a smaller last sprocket on the new cassette, does that mean chain has to be less links?... Anyone have any ideas??? Thanks in advance
 

Ajax Bay

Guru
Location
East Devon
A chain the same length will be fine (ie because you've gone from 12t to 11t). [Edit: you'll soon hear if you go small to small and the cage won't wrap it all.] The number of links is not the source of your problem. Unscrew the limit screws and redo the indexing from scratch (Youtube is your guide). The dishing on the new wheel may be just slightly different and therefore the vertical plane (with the inside of the right dropout as the reference) of the smallest sprocket maybe different too.
 
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Rohloff_Brompton_Rider

Formerly just_fixed
The wheel dishing and spacers make no difference at all. The problem would still occur if it had no spokes or rim and the chain line on derailleur geared bikes is generally not too important.

Sounds like you need to check; the hanger alignment just in case you've knocked it, the B screw is allowing enough chain wrap, that the chain is actually narrow enough too sit between the last two sprockets, that there wasn't supposed to be a shim between the last two sprockets (so by default the gap is too narrow for the chain to sit properly).

The symptoms could also be caused by knackered free hub bearings but there's usually other symptoms as well and your wheels are new.
 

boydj

Legendary Member
Location
Paisley
The new wheel will support 11-speed, so it is likely that some small adjustment may be needed to the limit screws as the cassette with spacers may not be sitting in exactly the same place as the old wheel/cassette combo. If that does not work, then it's time to look for more serious problems.
 
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