EPI Secondary Driven Clutch Spring - Black KSS3 Lets you fine-tune shift rate, side load pressure and full shift out poundage Designed using the highest quality materials All EPI springs are manufactured using a 5% tolerance- the lowest in the industry ISO 9001-2000 certified 2 1/2in. Load: 52.16 kg/115lbs. - 1 1/4in. Load: 99.79 kg/220lbs.