Pit Bike Chain Roller Our pit bike chain rollers are a standard fit for most pit bikes. The chain roller is sold complete with a high quality bearing. It has a fitment point of 8mm & a width of 30mm. Made from a hard wearing & durable material our chain rollers feature a longer roller life & reduce chain noise ensuring you will find this part an essential for your bike. These chain rollers come standard on our M2R pit bikes making them the available replacement if you ever need one.