Assume you will run your 1/10 pan car with 62mm dia. rear tires, you may try 20/96 - 64pitch which give the roll-out about 40.5mm/rev. Taking LRP 8.5T as an example, the suggested figures would be around 39-41mm/rev.
Also, some of the useful figures had been provided by Ching here. You can check it out.
Indeed, I will test my pro-ten as well and will try to get more data for reference.