I need a gear ratio for a 136'' track and brand new jaco's 64 pitch

If your tires are new and there Jacos. and there 2.50in.
On 136f racing line you would be looking for a rollout of around 1.90
You would gear around 4.0 . 120 spur and 30 pinion You may want to start with a 29 pinion. Should be a good starting point.
RichardT

thanks alot richard

thanks alot richard
Make a note. That is for stock.
RichardT