I am also looking to use my new 21.5 motor next week. I really reckon 27 pinion on 72 spur. Motor is very rough at low rpm but gets smoother as the revs increase.
__________________
Xray X12
Atom
SS GT
Supastox
TLR 22
Mi3.5
Mi5
Mad monkey,
Tamiya Monster Beetle/Mud Blaster
"if i'm not racing... i'm dreaming of racing" 
|