Speedthane, is manufactured from the Automotive Industry’s finest Micro-Cellular Polyurethane material (MCU), and consistently outperforms any other spring rubber currently available.

Speedthane has a Progressive spring rate.   This property is unique to MCU. Upon entry, the MCU will not give the driver the ‘bump’ associated with conventional spring rubbers.

Speedthane is available in 3 densities or spring rates, so no more half or third rubbers required.   This feature reduces spring sag and spring fatigue.

Speedthane maintains its rate under the most severe applications.   Tested at 180 F Speedthane retains 95% of its original spring rate, comparable rubber products retain less than 80% of their original spring rate. This makes Speedthane more consistent on long runs and hot track conditions.