What I heard is the biggest issue ties in with mentioned (perhaps inadvertently): carbon rims. Asking them to be the braking device (with associated heat-sink r

What I heard is the biggest issue ties in with mentioned (perhaps inadvertently): carbon rims. Asking them to be the braking device (with associated heat-sink requirements) can cause them to catastrophically delaminate. They can’t safely perform that double-duty like aluminium rims can. (Edit: clarity)