I've asked a few of the regulars thru PM but thought I'd just put it up on the main thread too.

Planning to run my old TT01 in a blinky 21.5 class. Need to get FDR down to about 3.6. I know the stock setup is limited to 5.72 (55t spur gear and 25 pinion). But I got an adjustable motor mount made so I'm not limited anymore. But would like to run 64 pitch spur gears. Something like a 64 pitch 73 teeth spur gear and a 64 pitch 53 teeth pinion (currently not sure if this would even work).

My question is:? Which is a better fit for the TT01 in terms of a spur gear adapter:

3Racing TB03 spur gear adapter

http://www.rcmart.com/3racing-tb0314...3-p-27689.html

OR

Tamiya TB03 aluminum spur gear mount

http://www.rcmart.com/tamiya-54094-t...t-p-28272.html

OR

Tamiya TT02 High Speed Spur Gear Set?

https://www.tamiyausa.com/product/it...oduct-id=54500

Anyone have a good gearing combo (and what brand spur gear) that also might avoid grinding down the cover over the pinion when the motor is mounted?

Any other advice is much appreciated. Thanks,

Ivan