Yes I didnt want to go lower than 13.5t as I knew it would be far too fast, but I thought 17t or there about would be too slow, but then I'm not experienced to comment so I thought something mid range would be ok...

What would the difference be between the 68t spur paired with the 22t pinion and my new options on there way being the tamiya 102t spur with the 29t pinion.... Was I right in thinking the more teeth the smoother the power transfer, or will it speed the car up, being not necessarily want I want?

is the standard set up the better option and what is the difference between the black tamiya 102t I've bought, over the 122t in the link I showed you above?

thanks