Originally Posted by
TB03Racer09
You won't have to upgrade anything for a 21.5t. I have been running my tb04 (same drivetrain as the evo6) for over 3 months now with a 21.5t and all the internal gears, ring and pinions and bevel gears have no signs of wear. My car is quieter than most belt drives that run 21.5t at the local track
That's good to hear, thanks. I guess from reading portions of the thread it seemed as there was a need to get down on the internal ration in order to efficiently run the higher turn (21.5) motors (wasn't really aware of any wear issues).
Maybe I would just be better off with the TB04 PRO II to help with making minimum weight.