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Ships within 48 hours · Estimated delivery Jul 29 - Aug 3
Battery lid bolts (2 pcs)
the tire may arrive slightly deformed
Direct Tuttio Fitment — Designed specifically for Tuttio
Stainless Steel clamp
RR 250 2T Race 2025-Current
Heavy Hitter Zero XB 420 Primary Chain Drive Conversion Kit 73 Supplies Battery lid bolts (2 pcs)The Heavy Hitter Zero XB 420 Primary Chain Drive Conversion Kit is a complete drivetrain conversion built to replace the stock belt drive on the Zero XB. Designed for riders running upgraded motors or controllers who need a drivetrain that can handle serious torque without adding unnecessary weight or rolling resistance. The lightest primary chain kit on the market with the least rotating mass and resistance of any 420 kit available. Fitment: Zero XB