Resin bead stopper (Rim lock) for rim width 2.15" Molded in resin for light weight. Main compatible sizes can be used for 4.3 - 3.5 - 7.5 inches (110 / 90 - 19 cm), 4.3 - 3.9 inches (100 - 18 cm), and more. In off-road situations where it is slippery in rain and mud such as off-road rides, the tires are not going forward. In such cases, the tire pressure can be removed from 0.5 to 0.8 and more, increasing the tire surface area to create traction. The more air is deflated the tire, the tightness of the tire and the wheel becomes weaker. Also, if you run it without the tightness of the adhesive force, the tire (rubber) will not turn, but only the wheels inside will be empty. The end result is a crushing out of the air valve on the tube creating a non-repairable punk. The bead stopper is used to prevent the tightness of the tire and wheel from weakening even if the air pressure is dropped. On most motorcycles, there are holes to allow the bead stopper to be installed preinstalled on the wheel. (rubber lid or other like will be attached) If there is no holes, please drill a new hole before installing. When you look at the foil, the width of the foil, such as 1.60 or 2.15, you can install the same size bead stopper. If you install one on the front and two on the rear, you can get the power out. Products are imported from the USA, and may vary slightly depending on the lot. Thank you for your understanding. This item is imported by officekk, acquired GS-1 code and subscribed to PL insurance. Beware of Imitated Replicas