One of the strongest wheel mounting systems around, the RWS Thru bolt has been proven reliable time and time again. This alloy axle RWS is the perfect way to strengthen up and solidify a standard drop out rear 135mm bike frame and wheel combination.One of the strongest wheel mounting systems around, the RWS Thru bolt has been proven reliable time and time again. This alloy axle RWS is the perfect way to strengthen up and solidify a standard drop out rear 135mm bike frame and wheel combination.