03-12-11, 11:30 AM
I've never subscribed to this idea that chain and sprockets "wear into each other"... at least, not in any useful way. The front sprocket in particular (which, as Dekker points out, suffers three times the workload of the rear) is going to reduce in tooth spacing while the chain will gradually suit a larger one. I can't see how changing sprockets part way through the life of a chain can harm it... and the OP's experience would seem to back that up.
Admittedly, without a scientific comparison that keeps an identical lubrication regime and riding style it can't be regarded as proof, but it's hard to argue that changing sprockets is detrimental to the life of a chain when 40,000 miles is what he normally achieves.
Fazer6868, have you tried measuring the chain wear directly (i.e. a 20 link length)? Are there links that have seized to each other? Unless the seals have failed or you got the side plates of the joining link badly spaced when you installed the chain it's likely that alloy rear sprocket is the cause of your problem and I'd try your regular sprocket change a bit earlier than usual.
Admittedly, without a scientific comparison that keeps an identical lubrication regime and riding style it can't be regarded as proof, but it's hard to argue that changing sprockets is detrimental to the life of a chain when 40,000 miles is what he normally achieves.
Fazer6868, have you tried measuring the chain wear directly (i.e. a 20 link length)? Are there links that have seized to each other? Unless the seals have failed or you got the side plates of the joining link badly spaced when you installed the chain it's likely that alloy rear sprocket is the cause of your problem and I'd try your regular sprocket change a bit earlier than usual.