Formula Four 99 Duro Classics Skate Wheels - 51MM

The Spitfire Formula Four 99D 51mm wheels are high-performance skateboard wheels known for a balanced 99a hardness that provides a smooth slide with controllable grip.

Size: 51mm diameter, making them a smaller, lighter choice favored for quick flip tricks and technical street or park skating.

Durometer: 99D (99a hardness), offering slightly more give and grip on slick surfaces than harder 101a wheels while still sliding smoothly.

Urethane: Built with anti-abrasion Spitfire Formula Four compound that resists flat spots.