Headerbs chain tensioner chainwheel for bicycle and motorcycle applications Material: hard rubber and metal Size: 8 mm universal Function and compatibility: Headerbs chain tensioner chainwheel designed for bicycle and motorcycle applications; suitable for most dirt pit bikes, road bikes, motorcycles, ATV, offroad vehicles, etc Installation: easy to install and directly old or damaged tensioner chain wheels Quality: 100% chain roller tensioner Use scenarios Offroad riding: use on dirt pit bikes or ATVs to maintain proper chain tension during rough, uneven terrain Road and street use: worn tensioners on road bikes or motorcycles to restore chain tension and drive performance Maintenance and longevity: install as part of routine upkeep on offroad vehicles to prevent chain slack and reduce wear on sprockets and chain Functions and benefits Maintains proper chain tension to reduce chain slack and derailment Directly replaces old or damaged tensioner wheels for quick maintenance Compatible with a wide range of bikes and offroad vehicles