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edscoble-
I'll break them, or I should use them?
@JWestland yeah, I wouldn't be super worried about them. I used 8sp Chorus cranks on my fixed for ages, mashing a huge gear. It's more the ISIS BB is an unknown quantity. But I've already installed the the square on my girlfriend's bike now so I guess we'll see!
TvH
I have the option of ISIS or square taper for some cranks. I weigh ~90kg. Will I kill the ISIS bearings or the SqT crank interface?