For 25 years, Main Drive freewheels have been the go-to for reliability. Perfect for BMX, fixie, and single speed bikes, they're equipped with 2 pawls engaging every 18°. Compatible with 1.375"-24tpi threads (16T+ freewheels), they accept 1/2" x 1/8" pitch sprockets and 1/8" wide, single speed chains. Removal is a breeze with 4-notch compatibility and the chrome plating ensures lasting durability.