Stealth Tri-Metal Yamaha R1 R6 Rear 520 Sprocket

Stealth 520 rear sprockets for the 98-09 R1 and 03-09 R6 models. Stealth Sprockets are the highest quality and most technological advanced sprockets in the world. The Stealth is a combination of long lasting steel and lightweight aluminium. Choose from ALL NEW color options and sizes from the pull down menu. FEATURES / INFO:

• What is the idea behind the Stealth or Tri-Metal sprockets? Stealth (Tri-Metal) sprockets were born from a desire to create the highest quality and most technologically advanced sprockets in the world. The Stealth (Tri-Metal) is a combination of long lasting steel and lightweight aluminium that utilises the best of both materials. The idea was first developed to satisfy the requirement of drag racers, who traditionally use steel construction sprockets because aluminium sprocket teeth can not survive the high torque delivered through the chain drive system. But steel sprockets are very heavy. Supersprox engineers conceived and developed the combination of the two materials in 2000–2001. The sprockets were first used on the bikes of our World Championship sponsored riders with the likes of Husqvarna World Enduro team. These teams and riders know how this type of technology can offer them prolonged system performance and reduced power loss. Supersprox have counted 4 world titles since that time.
  
• Why are Stealth (Tri-Metal) sprockets better than steel sprockets? At Supersprox we care about the weight and of course, we care about the power. We also believe that sprockets made entirely from steel are too heavy. So keep the steel teeth and replace the inner section with another lighter material. We have tested several materials and in the end we came to the conclusion that aluminium offered the best strength weight ratio for the inner part of the sprocket. We use aerospace aluminium to produce the inner section of the sprocket, because of its high impact strength. The inner section is virtually indestructible. It is machined on CNC machining centres and is highly accurate, so it will run perfectly on your bike. This inner section is then coated with a 15 µm film of organic based anti corrosion material. This prevents oxidization (the cause of pitting) and helps to prevent your sprocket coming loose on the wheel hub.
  
• Why are Stealth (Tri-Metal) sprockets better than Aluminium sprockets? While sprockets made from aluminium are light, there can be two problems that show up after some use. Firstly the tooth profile will change very quickly because of wear. The slightly worn sprocket will not engage with the chain properly and it will cause drag. The chain drag will drain power from your bike. You can loose as much as 5 BHP after only 40 minutes riding. Carbon steel teeth – last at least 3 × longer than 7075 aluminium sprocket teeth, so your drive system will last longer and run more smoothly. Add to this the Supersprox unique tooth design, which helps the chain stay in contact for longer and you have a fantastic life versus weight combination.
  
• Can the hard steel teeth damage my chain? There are many misunderstandings about chain and sprocket systems. We have heard people say that the steel sprocket will damage a chain. This is absolutely wrong and misleading information. Steel on steel works perfectly well. The rollers of the chain are a little harder than the teeth of the sprocket and these two very hard materials help to reduce friction. There is a much higher friction factor between a steel chain and an aluminium sprocket. The steel outer ring on the Stealth (Tri-Metal) offers greater life for your whole system, not just the rear sprockets, but the chain and front sprocket as well. You can expect an increased system life of up to 3 × that of a system using an alloy rear sprocket.
  
• Are the rivets strong enough? There is no doubt; our rivet material is just the best for fixing such a high performance sprocket. We have learned to use this technology to forge rivets into the sprockets. Over time we have moved from domed rivets to flat rivets and now the rivets only protrude 1.3 mm from the surface of the sprocket. They will not affect the running of your bike in any way. Forging increases the strength of the rivets. A small 8mm steel bar is forged into the sprocket and it has the strength of a 18 mm bolt. We learned this technology from the aerospace industry where they rivet the 7075 or titanium plates onto fighter jets wings. We have never had one single rivet break since starting to produce these sprockets and as of April 2005 we have used more than 1,200,000 rivets. The rivets are perfection.
  
• Is the Stealth (Tri-Metal) safe for my bike? 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. We have people using our sprockets on turbo charged bikes and bikes with Nitrous. Naturally there is a limit for all components, but we have not found the limit for the Stealth (Tri-Metal) up to this point.