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                   GMAC Installation Guide

                                            Rev 1.0

Thanks for your purchase of a GMAC motor kit! This motor has a number of 
unique features that set it aside from other direct drive and geared motor kits 
available on the market.

Locked Clutch

: Allows for effective and efficient regenerative braking 

down to very low wheel RPMs.  When used with a Phaserunner 
controller for virtual freewheeling, the drag torque present when pedaling
without assist can also be eliminated as well. 

Round 10mm Axle

: By using a round 10mm axle, the hub fits properly 

inside the bicycle dropout slot and the disk rotor aligns properly with 
industry standard 

I

ntegrated Torque Arm

: An integrated torque arm on the splined portion 

of the motor axle allows for zero play installations to handle forwards 
and regen torques without any slop. It also eliminates torque 
transmission and spreading forces on the dropout slot and transfers this 
force to a securely to the chainstays with a pair of hose clamps. 

Side Cable Exit

: Better protects electrical wire from damage and 

provides flexibility for axle hardware changes. 

Summary of Contents for GMAC

Page 1: ...so be eliminated as well Round 10mm Axle By using a round 10mm axle the hub fits properly inside the bicycle dropout slot and the disk rotor aligns properly with industry standard Integrated Torque Arm An integrated torque arm on the splined portion of the motor axle allows for zero play installations to handle forwards and regen torques without any slop It also eliminates torque transmission and ...

Page 2: ...disk rotor remove the installed torque plate to access disk rotor bolts This may require prying with a screwdriver Remove the disk spacer ring and replace it with the disk rotor Reposition the torque plate over the axle splines aligning the slot with the wire exit Align the splines of the axle into the torque plate and press or tap the plate down until the splines protrude past the plate ...

Page 3: ...f your frame has either a different angle on the dropouts for example a horizontal dropout you would need to remove the torque arm from the torque plate and rotate it such that the wire exit matches the angle of the dropout when the torque arm is rotated to meet the frame s chain stay The splined interface allows for rotation between the torque arm and torque plate in 30 degree steps Once the arm ...

Page 4: ...Select the one that fits most closely with the plane of the torque arm and then secure them together with the M5 bolt and flanged nyloc nut Finally secure the Frame Holder to the chainstay using the two hose clamps The black shrink tubing can be installed over each band in order protect the paint finish and have a more discrete look The M10 washers and axle nuts must also be installed and thorough...

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