XRAY - Model racing cars

Hi Xray folks...

OK, since I don't have, nor will have the funds to buy, for a very long time, a tire truing machine, I will not be able to cut foam tires. I will have to use them as they come out of the box. in other words, 65 rear diameter, and 63.5 front diameter. In order to get the best wear pattern during the course of say, a 30min race. which front side pulley should I be using? I would think that since the front tyres are smaller, it will be pushing from the back if I use a 1:1 ratio (the 26t pulley), so should I use the manual suggested 25t pulley in order to either balance the tire difference, or provide a slight pull from the front?

25t pulley will be fine. If you use 2mm smaller front tyres you will have no push / pull. If the rear is getting smaller than this ratio they will pull.

Thanks for that.