Supersprox Stealth Rear Sprocket (RST-990)

Stealth Rear Sprockets

What is the idea behind the Supersprox -stealth (tri-metal) sprockets ?

Supersprox -stealth (tri-metal) sprockets were born from a desire to create the highest quality and most technologically advanced sprockets in the world. The Supersprox sprocket -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 American 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 European World Championship (Factory) 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 6 world titles since that time.

Why are Supersprox -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. The inner sections are machined on CNC machining centres for accuracy, so they 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 ensures your sprocket will not come loose on the wheel hub.

Why are Supersprox -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 3x longer than 7075 aluminum 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.

(Think about bearings for example. They are steel on steel and that is what you would expect.)

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 Supersprox sprocket -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 3x 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.

Have you heard of any broken Supersprox sprocket -stealth (tri-metal)'s ?

We are not afraid to say that we did have some broken sprockets from the early days (2001) of development (You can not make an omelette without breaking eggs), but all of the technical issues were fixed by 2002. You can ride with confidence in the knowledge that the Supersprox -stealth (tri-metal) sprocket works 100% perfectly, 300% longer than an aluminium sprocket.

In 2007 the official KTM Paris Dakar rally team used Supersprox sprocket -stealth (tri-metal), by their choice. We did not give the sprockets to them, they bought them like any other customer. That is testimony to the quality and reliability of the product. Also in 2006 all of the KTM factory fitted bikes for the 6 days, were fitted (as standard) with Supersprox sprocket -stealth (tri-metal).

Is the Supersprox sprocket -stealth (tri-metal) safe for my bike?

The Supersprox -stealth (tri-metal)sprockets shown in these pictures are perfect. We are using them on all types of off road 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 15,600 miles if it is maintained correctly and fitted with a good quality chain. 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 Supersprox sprocket -stealth (tri-metal) up to this point.

Can I get one for my bike?

Most probably YES! Please click on the link (for my bike) and look for your bike. Then look for the contact details of a dealer near you. If you have any questions about fitment on your bike, please contact us through the (contact) link and ask your question. Don't forget to tell us your name, address, state and full description of your bike model. We make Supersprox sprocket -stealth (tri-metal)for the following brands, Aprilia, BMW, Betamotor, Ducati, GasGas, Honda, Husaberg, Husqvarna, Kawasaki, KTM, Marchesini wheels, PM wheels, Polaris, Suzuki, Triumph, Yamaha

Why is Supersprox sprocket -stealth (tri-metal)more expensive than a regular sprocket?

The Supersprox sprocket -stealth (tri-metal) is not more expensive than aluminium sprockets in real terms. Because the Supersprox-stealth lasts three times longer than an aluminium sprocket, it is worth three times more, but in many cases the Supersprox sprocket -stealth (tri-metal) is only 20 or 30% more expensive than an aluminium sprocket. And don't forget that if your sprocket lasts longer your chain will last longer, the cost/life ratio is lower with Supersprox sprocket -stealth (tri-metal) than with aluminium. Compared with pressed out steel sprockets that are sold very cheaply, the Supersprox-stealth again lasts longer. If you put on a high quality chain, don't ruin it with a cheap quality steel sprocket.

How long does it last?

As we have mentioned earlier. The Supersprox sprocket -stealth (tri-metal) sprocket can last for 15,600 miles if it is maintained correctly. There are naturally many determining factors, like the power of the bike and the type of chain used as well as the riding conditions. We believe that the following averages give an indication of the difference between sprockets.

Supersprox sprocket -stealth (tri-metal) sprocket = 15,600 miles

Pressed steel replacement sprocket = 8,125 miles (And they are twice the weight)

High quality 7075-T6 aluminium sprocket = 4,375 miles

Was it really necessary to have such splendid packaging?

We are sure that a sprocket of this quality requires packaging that reflects the effort and time we have put into it. There is no point of compromise with our idea and we don't want our customers to misunderstand just how good the Supersprox sprocket -stealth (tri-metal) sprocket is. And we did not want the sprocket to get damaged during shipping. The result is our blister pack.

Interestingly, the blister pack has been copied by many, but the patented Supersprox sprocket -stealth (tri-metal) has not been copied. You may see another famous name offering a sprocket with two ring design. But you need to ask yourself if you would prefer a sprocket like the Supersprox sprocket -stealth (tri-metal) that has been tested by thousands of riders in all conditions or a new and relatively untested two ring copy. The choice is yours.

Why did you call this sprocket Supersprox -stealth (tri-metal)?

Ste = steel (for the teeth)

AL = Aluminium (for the middle part)

T = Teeth (Supersprox new tooth design)

H = High performance

In USA we have called the sprocket Tri-Metal for legal reasons

In every case you will see our company name on the sprocket - Supersprox. That name is always a sign of quality.