Upgrades stock belt drive to chain driveRetains stock cush drive isolatorHeat-treated and coated for added durabilityCustom steel rear sprocket, includes 25-tooth front sprocketSprocket ratios comparable to stock gearingHigh-quality O-ring chain recommendedReplacement rear sprockets sold separately, 54-tooth part 1210-2493, 51-tooth part 1210-2494Made in the USARequires 130-link 530 chain (sold separately)