????USING AREA:The Guide Pulley are featured with a standard top heavy duty bearings ,Suitable for most vehicles, will match your vehicle chain perfectly. It is suitable for most of dirt pit bikes, street bikes, motorcycles, ATV, off road vehicles, etc – pit bike chain roller????WARM PROMPT: Please check the size and confirm this chain roller meet your need. – blue chain roller????STRONG FUNCTION: Chain Roller Tensioner Guide have specially designed with the swing arm, the chain then runs over it to keep it aligned, this chain pulley roller slider is an necessity for wheel guide, which helps the driving system to function well.????CONVENIENT USE:This Pulley Chain Roller is made from the high quality materials, and complete with heavy duty bearings ,fashionable, slide flexible, compression wear, very easy to use. The Chain Roller can also be used in gasoline motorized bicycle conversion kits.????VALUABLE CHOICE:Complete Guide Pulley, Opening mould in original vehicle data, can well replace o