General question about monster truck gearing? FDR

[Fabia130vRS]

So I have bought a cheap car from China.

its a reely rockhard. Compare it to a tt02b lets say… but just this has 115mm dia tires. Its a wanna be monster truck?

I have put in my Carson Dragstar 10T 4300kV inside with 28T pinion 48P and 76T spur gear. Thats 2.71 plus diff 37T / 11T thats 3.36. Total FDR of 6.07.

with 115mm tires. Am I killing my esc? I have to sorta half throttle punch it to start going. All is spinning free and nice.

what fdr is appropriate for brushless? On a monster truck ish car.