x X X X X 1017 AUDIO / VIDEO / NAVIGATION EXHAUST BODY / FRAME GRAPHICS / SEATS OFFROAD LUGGAGE SNOW BIKE SECURITY HANDLEBARS / CONTROLS LEVERS CABLES FOOTPEGS / FOOT CONTROLS INTAKE / FUEL SYSTEMS AIR FILTERS OIL FILTERS LIGHTING / GAUGES BATTERIES / CHARGERS ELECTRICAL SPARK PLUGS ENGINE PISTONS CLUTCH / DRIVE SUSPENSION / BEARINGS CHAIN SPROCKETS BRAKES PIT BIKE CHINESE VEHICLE PARTS INDEX STEEL, ALUMINUM & HYBRID SPROCKETS FRONT SPROCKETS • Precision-engineered with top-quality SCM-435 steel • Optimized tooth profile for consistent reliable performance • Carburized teeth to improve durability and reduce chain drag • Mud grooves to prevent dirt buildup and prolong chain life REAR STEEL SPROCKETS • Exceptionally durable anti-corrosion zinc finish to increase longevity • Ideal for rugged off-road terrain and extreme riding conditions • Consistent performance and extended lifespan REAR ALUMINUM SPROCKETS • Constructed with Strong, lightweight 7075-T6 aluminum • Ideal for riders seeking a lightweight yet durable sprocket • Offers reduced rotational mass for improved acceleration • Black anodized finish HYBRID REAR SPROCKETS • Aluminum center and steel outer ring ensures your sprocket looks as good as it performs • Perfect for riders seeking a balance of reduced weight, performance and longevity • Aluminum center for reduced rotational mass and better acceleration • Zinc-plated stainless steel outer ring for enhanced wear resistance • Provides rugged durability that stands up to the toughest rides Application Years Front Steel Sprocket Sizes Stocked Rear Steel Sizes Stocked Rear Aluminum Sizes Stocked Rear Hybrid Sizes Stocked BETA 125RR 2T `19-24 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 200RR 2T/Racing `19-24 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 250RR 2T/Racing `13-24 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 300RR 2T `13-24 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 300RX 2T `21-24 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 300 Xtrainer `15-24 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 350RR 4T/Racing `13-24 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 350RR-S 4T `17-24 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 390RR 4T/Racing `15-24 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 390RR-S 4T `17-24 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 400RR 4T `12-14 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 400RS 4T `14 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 430RR 4T/Racing `15-24 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 430RR-S 4T `17-24 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 430RS 4T `15-16 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 450RR 4T `13-14 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 480RR 4T/Racing `18-24 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 498RR 4T `13-14 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 500RR-S 4T `17-24 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 500RS 4T `15-16 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 520RS 4T `14 257-1901__ 12-14 258-8000__ 48-50 259-8000__ 48-51 GAS-GAS MC50 `21-24 257-1899__ 10,11 258-0452__ 40 MC65 `21-24 257-1900__ 14 257-0004__ 48 258-0004__ 47-50 MC85/Big Wheel `21-24 257-1905__ 13,14 257-0898__ 46,49 258-0898__ 46-51 MC125 `21-24 257-1901__ 12-14 257-0990__ 45,48-52 258-0990__ 48-52 259-0990__ 45,48-52 EC250 `21-24 257-1901__ 12-14 257-0990__ 45,48-52 258-0990__ 48-52 259-0990__ 45,48-52 EC250F `13-15 257-1590__ 12-14 EX250F `21-24 257-1901__ 12-14 257-0990__ 45,48-52 258-0990__ 48-52 259-0990__ 45,48-52 MC250F `21-24 257-1901__ 12-14 257-0990__ 45,48-52 258-0990__ 48-52 259-0990__ 45,48-52 EC300 `21-24 257-1901__ 12-14 257-0990__ 45,48-52 258-0990__ 48-52 259-0990__ 45,48-52 EC300F `13-15 257-1590__ 12-14 EX300 `21-24 257-1901__ 12-14 257-0990__ 45,48-52 258-0990__ 48-52 259-0990__ 45,48-52 EX350F `21-24 257-1901__ 12-14 257-0990__ 45,48-52 258-0990__ 48-52 259-0990__ 45,48-52 EC450F `13-15 257-0565__ 12-15 EX450F `21-24 257-1901__ 12-14 257-0990__ 45,48-52 258-0990__ 48-52 259-0990__ 45,48-52 MC450F `21-24 257-1901__ 12-14 257-0990__ 45,48-52 258-0990__ 48-52 259-0990__ 45,48-52 SPROCKETS
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