Gearing help

[big air]

Just got my pb cat and wanted to know what pinion is right using stock spur and a losi xcelorin 6.5 and im also using lipo "dont know if that makes a difference"

cheers steve

[mccrash59]

The little time I´ve spent with the car, I´ve been using stock spur and 23 pinion. The motor and ESC seem to be a bit more warmer than normal. Now I installed 21 pinion and have to test it out.

[Chrislong]

23 pinion sounds about right. 21 would be quite undergeared.

If it is getting hot, then open up the vents, cut the rear of the shell a little so air passes through and can exit the shell. BUT they do get hot, don't be alarmed as long as it can last 5-6 minutes. Mine regularly smells like its on fire.

[stefke]

23/83 on a good quality 6.5 is spot on for most brands of motors.

They do get hot, but nothing dramatic

And NEVER undergear a sintered BL motor.

[geerno]

I am just stepping up from stock 13.5, to an 8.5 Tekin.

With a 8.5 would I have to increase the pinion size from what has been recommended here? Say 24 / 83?

[mccrash59]

Thank you very much guys, I´m going to 23 again.

Gaerno, as faster the motor smaller the pinion. 24 should be ok.