The Stealth (Tri-Metal) sprockets shown in these pictures are perfect. We are using them on all off road bikes and street bikes up to 1400 cc. Bikes that are covering high mileage on the road and in races. A single sprocket will last more than 25,000 kilometres or 15,600 miles if it is maintained correctly. You can see more details about this on the sponsored riders page. We have people using our sprockets on turbo charged bikes and bikes with Nitro. Naturally there is a limit for all components, but we have not found the limit for the Stealth (Tri-Metal) up to this point.