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Thuekr-
Most MTB's has 73mm shell width
Rly? None of the ones I've ever owned has had anything but 68mm.
@se1derful The real reason is that a relatively large chainring (39T min.) combined with a narrow (42.7mm) chainline will probably hit the chainstay even if your MTB frame has the required 68mm BB shell.
gbj_tester
On that link do you know why they say it can't be used on MTBs?