Cheap savage Electronics?

[MetalMan]

For only 30mph, I think 4s2p A123 would work well, but I'd go with an 8XL instead of a 7XL. A123 is LiFePO4 and 3.3v nominal, so the BC6 will work just fine.

[lincpimp]

A mm 8xl combo will be fine especially with the 2 speed and mech brakes. I am sure that you could gear for around 35mph and be fine. Maybe have to put a fan on the mm, or have griffinru mod it for you. His mods really work to keep the esc cool and smooth out the motor too.