U
UB Machine [UBM]
http://www.ubmachine.com
Chassis components
Ultra Cool Brake Fans [UCB]
http://ultracoolbrakefans.com/main/
Hub mounted brake fans
Ultra-Lite Brakes [RDB]
https://ulbrakes.com/
Titanium and coated racing brakes and rotors
Ultra-Shield Race Products [ULT]
http://www.ultrashieldrace.com
Tear-offs and helmet accessories
UMI Performance [UMI]
http://www.umiperformance.com/
Suspension components and sway bars
Unisteer Performance Products [UNI]
http://www.unisteer.com/
Ring and pinions and steering components
US Gear [USG]
http://www.usgear.com/
Performance racing and street ring and pinion gear sets