Instead of swapping pinion gears, like most RC cars, Traxxas will sell you entire gear ... the TRX-4M with countless choices of performance parts. What are the downsides of the TRX-4M?

Traxxas shows how its Slash 4x4 RC car can drive across water and do jumps, thanks to paddle tires and high-speed gearing. And some foam for flotation, just in case. All the Slash fun requires is ...

The former is a good choice for novices needing a good balance between speed and control, and experienced RC enthusiasts will ...