AMuzi wrote:

Overall width. 4/5 speed systems used very
wide chain as you may recall. To get 8, 9,
10, 11 sprockets inside the 130mm road format
(originally seven speeds) the sprockets are
closer and so the chain is smaller.

So could one have like a 3 sprocket casette
with old chainring quality and then use a fat
chain to not have to replace anything save for
perhaps the chain, but even that much
less often?

Or does moving the chain wear down even
wide sprockets?

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