Parts & Accessories › LIGHTWEIGHT CLUTCH S-D Image 1 of 1 LIGHTWEIGHT CLUTCH S-D $348.95 Sold Out One pound lighter than the TSS-98Optimized rib design improves cooling with less wind dragTwin Traxâ„¢ helix requires only 4 fastenersTwin enclosed rollersImproved length to diameter ratio on bushingsSmooth up-shift and back-shiftTunable with helix angles and springsIncreases efficiency Sold Out Added! One pound lighter than the TSS-98Optimized rib design improves cooling with less wind dragTwin Traxâ„¢ helix requires only 4 fastenersTwin enclosed rollersImproved length to diameter ratio on bushingsSmooth up-shift and back-shiftTunable with helix angles and springsIncreases efficiency