As long as it doesn't bottom out in the 8mm bore, which it will in some forks, i.e. the centre bolt of a rear caliper will not go far enough through the 6mm bored section to provide proper thread engagement. Steel forks and hybrids with cabon blades bonded to metal crowns are generally OK, full carbon ones not so much.
As long as it doesn't bottom out in the 8mm bore, which it will in some forks, i.e. the centre bolt of a rear caliper will not go far enough through the 6mm bored section to provide proper thread engagement. Steel forks and hybrids with cabon blades bonded to metal crowns are generally OK, full carbon ones not so much.