Hi my son just received a traxxas rustler he is 7 years old and has never used a rc car that fast. What gearing can someone recommend for me to slow it down.
If it came with the Teaxxas Radio and speed control, you can set it to a training mode, which limits the throttle to 50%.
You just put a battery in the truck, then press and hold the EZ Set button, it will blink green, then start blinking red, keep holding button until it blinks red 3 times, and release it.
Agreed with @9x19 , if you have the stock electronics, you can put the esc in training mode which limits the throttle to 50% from 100% (sport and race mode)
If you want even slower than that, you can do down in teeth on the pinion gear, and/or up the teeth on the spur gear.
When I started out, when I was 7, I was using a basic old slash 2wd, xl5 brushed, which was on training mode, and 7 cell nimh batteries. My gearing was stock 16/90, and I ran that same setup for 5 years until I started getting more into it. Then, I got lipos, changed the esc to sport mode, and did crazy gear ratios up until I burned up my motors. And then I went to brushless last year when I was 13/14.