The Thermo SP is the most durable headset Race Face makes. Top race uses a combination of 7075-T6 aluminum and thermoplastic. The aluminum seats on the inner bearing race to give smooth, accurate performance. The lightweight, low friction outer thermoplastic ring has full 360 degree contact with the o-ring on the outer race, creating a seal and effectively protecting the top bearing from any contaminants such as mud, water, dust, and grime. 7075-T6 aluminum cups are forged and machined, and are guaranteed for life. Upper radial double sealed cartridge bearing with stainless steel balls spins smooth and friction free. Corrosion proof angular contact cartridge bearing with stainless steel balls is designed to withstand heavy loads. The inner bearing race is angled to mate with the fork race, allowing for full float if the head tube has not been reamed or faced. Like the top bearing, the lower bearing uses custom double seals and waterproof grease to ensure its longevity. High pressure low friction lip seal (not shown in picture) acts as a barrier, keeping contaminants such as mud, water, dust, and grime away from the lower cup and bearing assembly. Its low friction properties allow the lower bearing to spin smoothly without any drag. Nickel-plated alloy steel crown race is durable and lightweight.

Race Face Thermo SP Key features
Cool Features...

Thermo Headset Cap
7075 aluminium cups
Upper radial double sealed bearings
Corrosion proof angular contact bearings
High pressure low friction lip seal
Nickel plated lower race