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4

Firstly it's generally a good idea to change chains at around 0.75% wear. This means a cassette will last for several chains, since there is little wear on cassette , chainrings and jockey wheels when the chain is new/not stretched. However 7400km is not bad. You don't indicate the state of your other components but normally if a chain goes beyond 1% wear it ...


4

A Shimano 10-speed MTB cassette is a 10-speed Shimano MTB cassette. There is no functional difference. The differences will be only in the weight or the durability (the rate of wear) due to different materials. And some possibly very minor differences in the construction like whether the sprockets are rivetted together or not. Mostly irrelevant to most users....


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