Motorcycle Chain Roller Rail Tensioner Adjuster Idler for Bicycle Motocross Quad Bike Parts

※Universal Tensioner Installation & Debugging Steps: Secure the main bracket tightly to the vehicle reserved mounting position first; slide the pulley base along the long groove to set proper tension range; lock the sliding part and check that the spring pushes the pulley to cling evenly to the chain surfaceMaterial: Metal & Plastic Color As pictureQuantity: 2 pc Size: As the picture showsFits: For use on 420/428/520/530 chainNote:-- 1.Instruction is not included, professional installation is highly recommended.-- 2.Please check the size measurement chart carefully to ensure it's the right item you need before making payment.-- 3.Please allow 0.5-1.0cm difference due to manual measurement.(1 cm=0.3937'').-- 4.The color of the actual items may slightly different from the listing images due to different computer screen, thanks for

• Elastic Spring Buffer Structure: Built-in coiled elastic component delivers sustained outward pulling force to the pulley frame, automatically offsetting loose chain slack during riding and maintaining steady contact between the wheel and transmission chain in continuous operation
• Adjustable Sliding Mount Bracket: Long reserved sliding grooves on the fixed support frame allow horizontal shifting of the pulley assembly, the movable layout supports flexible position tuning to match different chain lengths and frame mounting distances of various two-wheel vehicles
• Rotary Smooth Guide Pulley: Round rotating wheel with smooth outer circular surface forms rolling contact with the chain link edges, reducing rigid friction between metal parts while guiding the chain to travel along a fixed stable track without sideways deviation
• Thickened Integrated Support Frame: One-piece thick metal bracket holds the pulley and spring components firmly as a whole, the rigid unified frame resists bending shape changes under long-term pulling pressure from the moving transmission chain
• Universal Chain Drive Mounting Fit: Standard fixed hole layout adapts central and rear chain installation positions on motorized bicycles, ordinary mountain bikes and BMX frames, realizing auxiliary tension adjustment for most single-speed chain transmission assemblies