15*2t 和 23*1t motor 的分别。

本人觉得速度上没什么分别。

23*1 有扭力一点，可以用低 ratio. around 5.xx

15*2 转速快一点，不可以用低 ratio. around 7.xx

反而15*2 省电.

你地话呢？

15T.... "ng soup, ng water"  Can't run in 23T class, and too slow for modified class.  Waste gas la.  

Besides, lower gear ratio, you got the speed, but that doesn't mean much on a track because you also lost torque to get around the corners.