TRP-33 Disc Brake Rotor - 140mm 6-Bolt 1.8mm Silver/BlackTRP 33 Disc Brake Rotor 140mm 6 Bolt 1. 8mm Silver Black. The TRP 33 2 piece slotted 6 bolt disc rotor offers high heat dissipation and tolerance due to the aluminum center as well as excellent stiffness to provide confidence in your braking. 1. 8mm standard thickness Six recessed slots create channels to allow water mud and other debris trapped between the pad and rotor to escape during braking Lightweight 2 pc design with stainless steel rotor and