Hybrid gearing advice

[soccersmyth]

4L0 with 31k motor.
Rgv 250 p arm with an aprillia Rs250mk2 wheel
160/60x17 rear tyre.
120/60x17 front tyre

As the 17 inch wheels will throw the gearing out.

Anyone know what gearing i'd need to use in this set up to get to 4L0 standard gearing.

I know i'll need offset front sprocket etc.

It's just i'd like to be ordering the right stuff.

Thanks in advance.

[willieeckerslike]

I am using 17/39 on mine, saying that it has not turned a wheel in anger as of yet.

I put up a similar post a while back and this was the advice I was given.

Good luck with the build