Kit final trasmission DID for Aprilia RS 50 Extrema 99-01 (Chain DID 420 D 120 links - Front 12 - Rear 47 - Chain 420)

All the kits are equipped with preferably SILENT gears, in case of lack of availability of the SILENT version they are replaced with the standard ones without the rubber profile.

If only the SILENT front and rear sprockets version is required, it must be expressly written in the order notes.

The D.I.D Professional final trasmission KIT  is composed by:

-Front sprockets steel.
-Rear sprockets steel.
-D.I.D chain more quality from the OEM chain.
-Chain closing tool (while stocks last)

The teeth of front sprockets and rear sprockets in the final trasmission kit D.I.D Professional, are the same of the OEM, or is indicated the modify in the title of the article.
 
If you need different teeth for your kit, or you want ergal ALU7075 rear sprocket, or you need a more performances chains, you must contact us and we will surely know how to satisfy you.

For the best working and longer duration of the transmission, it needs to be cleaned and lubricated every 1000 Km at least, using our specific cleaner and lubrificant for chains that you find CLICKING HERE

Application fields DID chains

By choosing the ratios, 1 front sprocket cog is equal to about 3 rear sprocket cogs (the exact ratio is given by: number of rear sprocket teeth / number of front sprocket teeth).

Remember that if you want more acceleration you have to mount a rear sprocket with more toothing, or a front sprocket with lower toothing. Ratios have to be necessarily and exclusively chosen by yourself. It is usual to mount a rear sprocket with 2 teeth more than the stock one, but that is however a medium choice which does not mean to be satisfying to everybody.

In a circuit, generally the right final ratio will be that allowing to achieve, at the highest gear, about 200 rpm more than the max power rate, always staying 200 / 300 rpm under the maximum rate the engine can reach. This way, you can take advantage of the trail of the driver who is preceding you.

Choosing the final ratio, remember that the bigger it is, the more the acceleration will be. But if it is too big, you will lose speed. If on the contrary the ratio is too small, you will lose acceleration and will not manage to reach the maximum speed.