[SilveradoHD]

Originally Posted by BL_RV0

I'd go with a 4s and gear for ~40mph. Try Brian's calculator if you havem't already.
www.scriptasylum.com/rc_speed

I already had the 5s ordered, should I cancel and go with a 4s instead, or would the 5s be dandy with the 2000kv medusa on a 13t or 16t pinion?