It wouldn’t need to be both carbon, but the way the crank arms attach needs to be the same, obviously. And with MTB’s the cranks are often a different length than road/gravel bikes - stock mtbs usually have 175mm, and stock road 172.5mm.
It wouldn’t need to be both carbon, but the way the crank arms attach needs to be the same, obviously. And with MTB’s the cranks are often a different length than road/gravel bikes - stock mtbs usually have 175mm, and stock road 172.5mm.