The GMAC motor system was developed in conjunction with Grin Technologies and Mac motors, and is the premier lightweight, high-powered, regenerative-capable electric assist system. Featuring:

• An 8.6 lb rear hub motor with up to 100 N-m of torque - higher than any hub-motor (and almost any mid-drive) e-bike on the market!
• 28mph top speed, up to 40 mph for speed-unlimited software settings.
• Variable regenerative braking - increase your range by 10-15% while virtually eliminating brake pad wear.
• A 720 watt-hour frame-locking battery with cells from Tesla, with an upgraded even higher-capacity Sanyo battery available.
• The Phaserunner/Baserunner motor controller, a state-of-the-art motor controller from Grin Technologies that provides immense power, top speed boost, and customizable motor response in a tiny package
• Cycle Analyst V3 for unprecedented diagnostic and control precision
• Sempu Torque Sensing Bottom Bracket (Square Taper - Inquire for Other Options)
• A revolutionary motor axle that fits modern bicycles perfectly, with no risk of the motor's torque damaging your frame (not thru-axle compatible)
• A 2-year warranty on the motor and battery, and a 3-year warranty on all other parts

Price includes professional installation at our Seattle shop. If you're outside of the Seattle area, we can ship it to a local bike shop for professional installation at no additional cost, providing detailed instructions and phone support.