BIKEMASTER 520H Heavy-Duty Precision Roller Chain, SUNSTAR Front Steel Sprocket & Rear Aluminum Sprocket Kit for ATV/UTV HONDA TRX250R FourTrax 1987-1988 O.E.M. Gearing 13/38 BIKEMASTER 520H Heavy-Duty Precision Roller Chain Color: Natural Type: 520 Links: 86 Suitable for 650cc max street and 450cc offroad use Average tensile strength of 8,000 lbs. Includes clip master link Developed for performance, providing low friction for the most power transfer. Designed and constructed with high-strength steel and solid rollers for durability and longer life. SUNSTAR Front Steel Sprocket Teeth: 13 Manufactured from case-hardened chromoly steel for the ultimate in strength and durability. “Parkerizing” surface treatment for rust and corrosion resistance SUNSTAR Rear Aluminum Sprocket Teeth: 38 Constructed of high-quality, aerospace-grade 7075 T-6 aluminum. Computer designed weight reduction holes for lightness. Exclusive tooth-valley design provides 24% better chain contact area for the best power transfer possible. Hard-anodized coating for added durability and a superb finish.