T4 for a 7 year old, what approx pinion for a silver can 540 stock motor please !

[Colinevan]

I'd like to introduce the youngest to a nice spare t4 that iv got . He's had a go on my brushless t4 and it's way too much as he hasn't grasped the basics such as steering or brakes or why the car turns in the opposite direction when it's coming towards you ha ha.

I basically need a nice slow intro for the time being and have found a spare Tamiya 540 std that should be ample . All I need is a rough idea on pinion size if anyone has done anything similar.

Thanks in advance.

Col.

[SLEENAD]

My 5y old son has a b4.1 and his 8y old nephew has a b4, both with a standard mabuchi on 19/81 and nimh and tamiya teu and lrp f1 speedo.

Nice speed (estimate 20-30kph) but more importantly: CONTROLABLE

AND TAKE 'EM TO THE TRACK! IT'S MUCH MORE FUN AND LEARNING THAN THE DRIVEWAY!

[alex97]

hi
i have a b4 and i have a 22 gear on it runs well but i have Brushless Motor so may be a 20 or 21 that is what i would do