The majority of the stock class motors were
- Gstyle 21.5 high torque 14.0 mm rotor
- Team Powers 21.5
There were a few Trinity D3.5's 21.5's. But, the majority were the ones mentioned above.
The Gstyle motors were the dominant motor ( I'm being biased, because I had one). The large rotor and timing settings required a much higher roll-out. People were running 100 mm roll-outs.