KW 60110129 High Performance Racing Spring 15-240Description KW 60110129 High Performance Racing Spring 15 240 KW high performance racing springs are produced from specially alloyed and tempered spring steel. The increased endurance of the material allows for new spring constructions with a reduced wire diameter. These springs are up to 30% more efficient than conventional racing springs. At the same construction length, this results in more spring travel, higher block load, and less weight. Up to