Bikeman Secondary Helix Pro RSKU: 20 PRO Optimize ACCELERATION AND QUICKER BACKSHIFTING WITH OUR PERFORMANCE HELIX High Elevation Helix sku: 20 PRO 3 Good for dune riding over 5000' and high tire applications Stage 2 Stage 3 Helix sku: 20 pro 4 This helix optimizes power delivery for stock to 70 crank HP gains (Our Stage 2 & 3 kits) CB 1 15 25
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