Originally Posted by
Offroadrcracer
what size is best for speed and agility combined?
1/8th scale is a sort of plateau for speed, both in RTR and to a degree in race rigs. For example, the Traxxas Slash 4x4 VXL is rated at 60mph for 1/10 scale, but the 1/5(?) scale X-Maxx is only rated for 50mph. Weight factors a lot. 1/10 is the most common.