The 9C 9x7 motor I bought to replace my fried generic DD has much shorter axle length.
After attaching my freewheel, there is insufficient room to add even a modest 3mm thick torque arm, and still have enough threads to properly attach the axle nuts on the drive side. The part of the axle that's been machined flat to fit into 10mm dropouts is 29mm long on this side.
The non-drive side looks a little better, but still not really enough axle to play with after adding a 4mm thick torque arm. The flat bit of the axle on this side measures 27mm long.
I'm considering sending the 9C back for a refund and going back to ebay for a generic Motor. The fried generic ebay motor had 35mm and 37mm axle flats, which left plenty of space for everything. Why is the 9C so marginal?
Does anyone have a suggestion of how to attach the this motor to this (alloy) frame and manage axle torque ?
I'm not trying to build a hotrod, power levels < 1.5kW and I can live without regen FWIW. The lowest image shows the old fried motor axle in my dropouts. Should I be filing these dropouts to get a more snug fit on the axle? I've been holding back as there's not really a lot of material to play with on the dropouts.
After attaching my freewheel, there is insufficient room to add even a modest 3mm thick torque arm, and still have enough threads to properly attach the axle nuts on the drive side. The part of the axle that's been machined flat to fit into 10mm dropouts is 29mm long on this side.
The non-drive side looks a little better, but still not really enough axle to play with after adding a 4mm thick torque arm. The flat bit of the axle on this side measures 27mm long.
I'm considering sending the 9C back for a refund and going back to ebay for a generic Motor. The fried generic ebay motor had 35mm and 37mm axle flats, which left plenty of space for everything. Why is the 9C so marginal?
Does anyone have a suggestion of how to attach the this motor to this (alloy) frame and manage axle torque ?
I'm not trying to build a hotrod, power levels < 1.5kW and I can live without regen FWIW. The lowest image shows the old fried motor axle in my dropouts. Should I be filing these dropouts to get a more snug fit on the axle? I've been holding back as there's not really a lot of material to play with on the dropouts.
