Technical & Reference Section > Tech and Restoration

12 tooth cassette driver help...

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bof:
what chain have you got and what cassette is it you are using, is the chain too long or too short or does it physically not fit onto the sprocket.
there are 2 sizes of chain available 1/8th normal bmx pitch and there is the less commom in the bmx world but some people use them and most MTB and geared bikes use 3/32th pitch

oberonspacefruit:
it doent fit on the sprocket.

not width wise, it fits for 2 or 3 teeth, but then starts to misfit, and it gets progressively worse.

harris:
i havent tried it on a larger sprocket yet mate.

SaMAlex:

--- Quote from: bof on April 28, 2007, 07:37 PM ---what chain have you got and what cassette is it you are using, is the chain too long or too short or does it physically not fit onto the sprocket.
there are 2 sizes of chain available 1/8th normal bmx pitch and there is the less commom in the bmx world but some people use them and most MTB and geared bikes use 3/32th pitch

--- End quote ---

I thought that 1/8th and 3/32nds was the width and not the pitch. A chainring and sprocket that are for 3/32 will take a 1/8 but it will be a little sloppy side to side. (eg, I think flight rings and shimano freewheels take both chain sizes).

The half link thing is just to do with getting the rear wheel in the right place, esp important as many NS dropouts have very little slot length. The style of a chain with all half links is just that, style, and it also means you can get the wheel placement spot on without having to get an extra half link like you would if you ran a normal chain. Having said that, some of the half link chains do cope with the tight curve of a small sprocket better than some normal style chains.

It sounds like your chain just dont wanna cope with the tight radius so you need to get a more suted one. Doesnt have to be a half link style, but just one designed for small sprockets.

oberonspacefruit:
such as?


will the khe collapse be suitable?


its not my bike, its my sons, and weve just driven 50 miles there, and 50 miles back to get new cranks/chainwheel/driver and having spent 170 quid of his hard earned pocket money, you can imagine how gutted he is...

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