The MotoSport.com Renthal Chain Sprocket Kit includes ONE Steel Countershaft (Front) Sprocket, ONE Aluminum Rear Sprocket, and your choice of ONE Premium 520 Drive Chain, each with the following features: Sprockets / Chainwheels Included: When looking to replace your sprockets, Renthal sprockets are an easy choice because of their strength and inexpensive price tag. Renthal Front Sprocket: Also known as "chainwheels", Renthal front sprockets are precision manufactured to withstand the rigors of Supercross, motocross, and enduro racing. Renthal Front Sprockets are made out of 655M13 nickel-chrome-molybdenum alloy steel. What does that mean to you? Ultimate strength and hardness. Self-cleaning mud grooves prevent the build-up of dirt. Precision machining to extremely tight tolerances ensures that Renthal front sprockets are always within spec. Renthal Rear Sprocket: Precision CNC manufactured to extremely high tolerances from a high strength, specially enhanced 7075 T6 aluminum alloy. Unequalled accuracy of fit, tooth profile and concentricity for longevity and maximum power transfer. Maximum reduction of unsprung revolving weight at the rear wheel, through a choice of materials and design insures maximum power transfer. Renthal rear chainwheels are 33% lighter than steel yet incredibly durable. Hard anodized finish. Your Choice of Drive Chain: D.I.D 520 Standard Chain - 120 Links: The D.I.D Standard Non-O-Ring Chain is designed for low horsepower, smaller displacement mopeds, scooters and vintage motorcycles. For machines originally equipped with non-O-ring chains. Solid rollers. Shot-peened parts. High cylindrical and roundness accuracy. Exacting tolerances provide low friction. Pre-stretched. Special alloy steel with extended riveted bushing "anti-kink" design. Highest quality non-O-ring chain in overall combined performance. Average tensile strength of 7,200 pounds. Wear life index: 100. Includes a clip-style master link. 120 links. Note: Non-sealed chains require more regular maintenance than sealed (O-ring, X-ring) versions and are mainly recommended for off-road use. D.I.D 520 NZ Heavy Duty Chain - 120 Links: Pinning your bike out of every turn might tear apart the stock chain, but D.I.D and their 520NZ chain will not let you, or your race for first, down. For machines originally equipped with non-O-ring chains. Solid rollers. Shot-peened parts. High cylindrical and roundness accuracy. Exacting tolerances provide low friction. DHA pin treatment - hard chromium-carbide layer formed on pin surface for exceptional strength and wear resistance. Pre-stretched. Special alloy steel with extended riveted bushing "anti-kink" design. Highest quality non-O-ring chain in overall combined performance. Up to 19% higher tensile strength; average tensile strength of 8,220 pounds. Wear life index: 410. Rated for up to a 250cc bike. Weight (per 100 links): 3.54 pounds. Includes a clip-style master link. 120 links. Note: Non-sealed chains require more regular maintenance than sealed (O-ring, X-ring) versions and are mainly recommended for off-road use. D.I.D 520 DZ2 Chain - 120 Links: The All New D.I.D 520DZ2 is the best value in a lightweight, high-performance chain designed for motocross racing. Great value in a lightweight chain. Designed for off-road riding and motocross. The DZ2 has twice the lifespan of the previous DZ. SDH pin treatment - hard chromium-carbide layer formed on pin surface for exceptional strength and wear resistance. Flexible inner soft core absorbs shock. For entry level motocross, trial riding at an affordable price. Average tensile strength of 7,870 pounds. Wear life index: 410. Rated for up to a 450cc motocross bike. Weight (per 100 links): 3.08 pounds. Includes a clip-style master link. Gold finish, 120 links. Notes: DZ and DZ2 Connecting Links are not interchangeable. Non-sealed chains require more regular maintenance than sealed (O-ring, X-ring) versions and are mainly recommended for off-road use. D.I.D 520 ERT2 Gold Chain - 120 Links: The D.I.D ERT2 chain is the most trusted chain in Supercross and motocross racing because of its reputation of meeting the high quality demands that are required when pushing the limits. It was designed with the intention of making a chain that is optimized for the purpose of racing. D.I.D beefed up the ERT2 chain by increasing the pin size by 3% to give the chain an average tensile strength of 8,100 pounds. Increasing the strength of the ERT2 chain did not come with a sacrifice of weight, in fact DID was able to shed 5% from the previous ERT chain. Exclusively designed for motorcycle racing. High-performance, lightweight and low friction chain. 3% bigger pin diameter and 5% lighter than former ERT. Provides the highest wear resistance, tensile strength and impact resistance. Average tensile strength of 8,100 pounds. Wear life index: 430. Rated for up to a 450cc motocross bike. Weight (per 100 links): 2.99 pounds. Includes a clip-style master link. 120 links. Notes: ERT and ERT2 Connecting Links are not interchangeable. Non-sealed chains require more regular maintenance than sealed (O-ring, X-ring) versions and are mainly recommended for off-road use. D.I.D 520 ATV X-Ring Chain - 100 or 110 Links: The D.I.D X-ring is superior to other types of O-ring designs; it has half the power loss and 1.5 to 2 times the wear resistance of a normal O-ring chain. D.I.Ds patented X-ring construction reduces friction by twisting between the side plates instead of being squashed. Normal O-rings and other makers modified O-rings have squashed points that increase friction. The twisting action of the X-ring disperses the pressure and minimizes power loss. The X-rings four contact points greatly increase its sealing performance. This keeps the dirt out and the lubrication in much better than any other O-ring. X-rings have the greatest wear resistance of any other type of O-ring or non-O-ring chain. Uses a special steel alloy designed specifically to provide the extra strength required for quad racing. Features the same low friction, long wearing X-ring technology as D.I.Ds VX, ZVM-X, ZLV, and ERV chains. The ATV X-ring chain is engineered to create additional pockets to lock in grease to prolong the life of the chain. Solid rollers. Shot-peened parts. High cylindrical and roundness accuracy. Exacting tolerances provide low friction. Pre-stretched. Extended riveted bushing "Anti-Kink" design. Average tensile strength of 7,600 pounds. Wear life index: 3250. Rated up to a maximum displacement of 750cc. Weight (per 100 links): 3.65 pounds. Includes a clip-style master link. 100 or 110 links. D.I.D 520 ERV3 X-Ring Chain - 120 Links: The D.I.D ERV3 X-ring chain is the ultimate high-performance, lightweight, low-friction race chain available and is used extensively by many off-road race teams. The ERV3 X-ring chain utilizes D.I.Ds patented X-ring technology which reduces friction by 50% over standard O-ring chains for minimized power loss. The pins on the ERV3 X-ring chain have been put through a patented heat-treatment process to produce a pin that is 1.5 times harder than conventional pins. The result is a chain that is significantly stronger and offers better wear resistance than many other chains on the market. D.I.D ERV3 X-ring chains feature a gold-plated finish that resists rust and adds a little style to your motorcycle or ATV. Exclusively designed for motorcycle racing. High performance, lightweight and low friction chain provides the winning edge in World Class competition. Features gold color plates. Average tensile strength of 8,650 pounds. Wear life index: 3100. For 250 - 750cc Rally, 750cc Superbike and 250 - 750cc Endurance applications. Weight (per 100 links): 3.30 pounds. Includes a rivet-style master link. 120 links. D.I.D 520 VX2 X-Ring Black Chain - 120 Links: D.I.Ds Pro-Street X-Ring VX Series Chains are high quality X-Ring chains with superior strength to withstand the horsepower of todays dual sports and trials bikes. The VX Series uses D.I.Ds patented low friction X-Ring for maximum performance. Greater rigidity (7% higher than previous VM chain) creates smother handling, reduced power loss and quicker response. Highest value in all D.I.D series. D.I.D X-Ring has half the friction and 50 - 100% longer wear life compared to typical O-ring chains. Superior longer life than previous VM series. Solid rollers. Shot-peened parts. Pre-stretched. Extended riveted bushing "Anti-Kink" design. Replaces the Professional O-ring V Series and the Premium X-ring VM series chains. Average tensile strength of 8,210 pounds. Wear life index: 3500. Ideal for bikes and ATVs up to 750cc. Weight (per 100 links): 3.35 pounds. Includes clip-style master link. 120 links. D.I.D 520 VX2 X-Ring Gold and Black Chain - 120 Links: Greater rigidity (7% higher than previous VM chain) creates smother handling, reduced power loss and quicker response. Highest value in all D.I.D series. D.I.D X-Ring has half the friction and 50 - 100% longer wear life compared to typical O-ring chains. Superior longer life than previous VM series. Solid rollers. Shot-peened parts. Pre-stretched. Extended riveted bushing "Anti-Kink" design. Replaces the Professional O-ring V Series and the Premium X-ring VM series chains. Average tensile strength of 8,210 pounds. Wear life index: 3500. Ideal for bikes and ATVs up to 750cc. Weight (per 100 links): 3.35 pounds. Includes clip-style master link. 120 links. Renthal 520 R1 Gold Race Chain - 120 Links: Renthals R1 Works Chain is a high-strength non O-ring chain with excellent impact load resistance designed specifically to withstand the stress found in off-road applications. This chain is the choice where a combination of high strength, light weight and maximum power transfer are important considerations. Shot-peened alloy steel side plates for high tensile strength and maximum impact load resistance. Chamfered inner links to reduce the chance of chain derailment. Extended bushings to reduce friction between outer and inner link plates, maximizing power output. Chromized bearing pins for excellent resistance to wear. Gold color side plates help prevent corrosion. Most perfectly matched chain for Renthal sprockets allowing maximum power at the rear wheel. This also extends the life of both the chain and sprockets. Average tensile strength of 7,644 pounds. Wear life index: 300. Maximum displacement (street / off-road): N/A / 500cc. Weight (per 100 links): 2.13 pounds. Each chain includes master link and a pair of latex gloves for mess free installation. 120 links. Note: Non-sealed chains require more regular maintenance than sealed (O-ring, X-ring) versions and are mainly recommended for off-road use. Renthal 520 R4 ATV Z-Ring Chain - 100 or 110 Links: Renthals R4 ATV Chain is a premium strength Z-ring chain with excellent impact load resistance, designed specifically to withstand the stress found in ATV applications. The R4 chain features a heavier duty construction process and materials than the standard Renthal R3-2 O-ring chain which increases its service life and tensile strength. The patented "spring effect" Z-rings guarantee constant lubrication for longer life and pins manufactured from special alloy steel also contribute to better resistance from wear. Thicker side plates and a quad riveting manufacturing process round out the upgrades on this ATV-specific chain. Patented Z-ring seals dramatically increase the life of the chain. Larger diameter pins manufactured from specially enhanced steel improve the resistance to shock loads. A quad riveting process on each pin increases the tensile strength of the chain. Thicker inner and outer plates increase the fatigue life of the chain. Available in 520 pitch only. Average tensile strength of 8,093 pounds. Each chain includes a pair of latex gloves for mess free installation. 100 or 110 links. Note: The Renthal R4 chain is supplied with both an easy-fit split master link and a superior solid-pin rivet master link which matches the durability of the chain. Renthal 520 R3 O-Ring Chain - 120 Links: Renthals R3-2 O-ring Chain is a high-strength sealed-ring chain with excellent impact load resistance designed specifically to withstand the stress found in off-road applications where an O-ring chain is desired. This chain is the choice where a combination of high strength, light weight and maximum power transfer are important considerations. The O-rings help extend chain life by retaining the special vacuum-injected grease near the critical pin area. Chain comes pre-stretched to shorten break-in period. Nitrile O-rings extend chain life by retaining special vacuum-injected grease inside the chain joint. Shot-peened alloy steel side plates for high tensile strength and maximum impact load resistance. High-carbon alloy steel bearing pins for excellent resistance to wear. Gold colored side plates help prevent corrosion. Pre-stretched to enhance performance of the chain. Available in 520 pitch only. Average tensile strength of 7,644 pounds. Wear life index: 750. Maximum displacement (street / off-road): N/A / 500cc. Weight (per 100 links): 3.36 pounds. Each chain includes a pair of latex gloves for mess free installation. 120 links. Note: The Renthal R3-2 chain is supplied with both an easy-fit split master link and a superior solid-pin rivet master link which matches the durability of the chain. Note for installing X-ring chains: As X-ring chains are wider than standard roller chains, when fitting an X-ring chain to a motorcycle that was fitted with a non O-ring chain as original equipment, it is essential to check that there is proper clearance of the engine cases near the countershaft sprocket and any other places of close contact. Failure to do so could result in damage to the chain and motorcycle and could ultimately cause the chain to fail. Note: Image is for reference ONLY, actual product will vary based on fitment and selection.