Schumacher fireblade gearing

[StuartH]

Hi, I have a schumacher fireblade evo on the way that I intend to race alongside my son and other contemporary cars as a bit of fun.

I was going to swap over my speed passion 13.5t brushless motor and the ESC that came in a durango rtr car. Just wondered what sort of gear ratio I should look to run that won't munch the gears or fry the speedo? Will be running 2s lipo that are 4000mah and 20c

Brushless seem to be geared a little differently with the massive pinion that came on my dex210!