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How speed specific are chainsets?>
Generally not very. You should be able to run most on any combination. 8-11 should all be mix and match.
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Could I just change shifters/cassette/derraileurs and leave the chainset as is?
Yes: chains only got narrower internally once, when nine speed was introduced (from 3/32" to 11/128"), so a ten speed chain (which you'll need for the cassette) will work fine with nine speed rings.
fredtc
hugo7
Scilly.Suffolk
@Brookly_Bay
Er, potentially stupid question.
How speed specific are chainsets?
Specific example - partner's bike is currently 9 speed. Considering adding the nice new Tiagra 10 speed kit. Could I just change shifters/cassette/derraileurs and leave the chainset as is?
Or are the chainrings thinner to account for the thinner chain?