The Real Speed 1/8 Track Chainring set provides unmatched performance for the budget minded track rider. The TRK-1 offers super stiff T6 heat-treated 6061-aluminum arms, a CNC machined T6 7075 chain ring, and an external bearing bottom bracket. This combination translates to one incredible power-transferring crank set. BCD: 144 1/8" Track Chainring
