Spitfire - Formula Four Lock-ins 99a Skate Wheels
Spitfire Formula Four Lockins 99a Skateboard Wheels are the newest wheel from Spitfire. These asymmetrically shaped wheels give you more control at speed, so you can lock in your 5-0 grind around the whole bowl! Tested by Spitfire Team riders, Formula Four Performance Urethane lasted longer, withstood more abuse and performed superior to all other wheels.
Wheel Size - 53mm, 55mm, 57mm
Wheel Shape / Profile: Lock Ins - Looking for the best of both worlds, then the newer shaped Lock Ins are for you. It’s an asymmetrical shape, meaning it has a different shape on each side. A flatter side for locking into edges and a chamfered side that won’t catch when sliding so you can lock in your 5-0 grind around the whole bowl!
Urethane - Formula Four 99A: Spitfire released their new Formula Four wheels a few years ago now. The latest formula was designed for higher abrasion resistance. This means it is a little harder to flat spot. Formula Four 99A wheels are generally decorated with a blue themed graphic. Unless of course it is one of the signature wheels. The signature wheels feature artwork custom designed for each rider. 99A is considered a softer wheel in the modern skateboarding scene. They are still very hard. The 99A formula will provide a little more grip on super smooth surfaces and is a little more forgiving to ride on rougher surfaces..