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Continue to ChatDriven Gear - Double Gear, 44T/31T, ATV, Hisun, 500-700cc - 20A7750 - PBC1721F1 - https://www.giobikes.biz/express-parts-catalog/engines-parts-upgrades/driven-gear-double-gear-44t-31t-atv-hisun-500-700cc-20a7750-pbc1721f1