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In both cases the crank must be compatible with '8 speeds'. True, but there's a larger range of what's "compatible" on the crankset than there is with a cassette. For an 8-speed bike, a 7-speed or a 9-speed crankset would probably work just fine. There's even a small chance a 10-speed or even an 11-speed crankset could work well enough, although I'd suspect those would be very prone to the chain dropping either inside the small ring when shifting to an easier gear or outside the large ring when shifting to a harder gear. The problem is you won't know until you put it on the bike...
– Andrew Henle
Commented Sep 15, 2020 at 15:11
(cont) So purchasing something that might not work is usually a bad idea unless you can't get something better, or you're willing to take the chance.
– Andrew Henle
Commented Sep 15, 2020 at 15:13
@AndrewHenle a 9 speed crank would be fine but 10 or more would definitely have issues. Given that cranks get more expensive as the number of speeds go up there is zero point spending more money on something that will not perform as well.
– Argenti Apparatus
Commented Sep 15, 2020 at 15:15

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