Spitfire Formula Four Lock-Ins 99A Size:55mm Bearing Seat:

Bearing Seat:

best for racers who use precision trucks and properly tighten their axle nuts

and you will roll much smoother and faster on rough streets and sidewalks…even in places you used to have to walk your board

V5 Sidecut

Spitfire Formula Four Lock-Ins 99A Size:55mm Bearing Seat:Lock In Shape Asymmetrical shape that helps you stay locked in on grinds High Rebound Compound Formula Four Urethane Formula Four urethane is unlike any other. Both in the streets and under high speed stress tests in Spitfire's lab, Formula Four wheels retained more material, coned less and kept their original shapes and sizes longer than any other wheel.