Hey Guys, FYI, the V3.0 17.5's are pretty tough. The track was onroad 250x100 asphalt. I geared 75/65 and total ratio of 2.49. Temps was only at 129* for a 7 minute race. You will love the new Banzai 17.5's! I don't recommend this gearing for anything smaller than this track. Make sure you gear accordingly.