Aprilia Rear Sprockets

[dbardell]

Any source for Aprilia TXR312 rear sprocket? Does anyone know if the later model Aprilia Climber rear sprockets are the same as the TXR.  Trials Shop here in the US is still on back order.  All I need to get my TXR going.

[pschrauber]

Sadly the bolt pattern to the TXR is super unique, also the pattern for the front disc mount is one of a kind. Then the engine uses internal a different gearing compared to all other previous or later Aprilias. So everything is a bit different here.

It depends to the size you want to have or if you like redneck solutions by simply adding holes where in need.

Here the bolt pattern with original rear sprocket:

I did not like the original 13 / 38 teeth set up with a 0.342 ratio it is for my taste too fast. As it is not possible to find any ressource for a good trials set up I started to try it out myself ...

I tried out a 12 / 42 teeth (0.285), still a tiny bit too fast, then a 11 / 42 teeth (0.262) which was a bit too slow, (and I wanted a smaller rear sprocket).
The 11 /42 can be seen below, I took a climber sprocket and just drilled additional holes ...seen here

 I have now custom fabricated a 40 teeth rear sprocket to fit the 11 teeth front 0.275 which I think will suit my needs.

The sprocket above was made by alphatechnic in Germany.

[dbardell]

Thanks for the info.  Guess I will give this a try.   Nice looking bike.  Mine isn't quite as clean, but I don't have much invested --- yet.

Dave

[b40rt]

Talons Sprockets have several hole combinations so is the easy solution. 11 / 38 is my preference.  (0.289)

http://www.motoswm.co.uk/shop/swm-trials-rear-sprocket/

Edited February 27, 2017 by b40rt