"M" Stands for Mid Drive! Brand new for 2017 is the ULTIMATE offroad Revolution! Packing a powerful 1500W mid drive, this Revolution is made to explore gnarly terrain with 8" of front travel and 9.5" of rear travel. By utilizing the bikes gearing, this lightweight and balanced Revolution can conquer any terrain! Lightweight, at only 66 lbs, the Revolution M is the ultimate trail companion! Proudly hand built and assembled in the USA!