I'm currently trying to put together an electric bike using a cyclocross frame and a q100 cst motor. I chose it partly because it's fitted with dual cable disc brakes. I'm having an issue with the disc brake mount on the motor.
Where the disc would mount, it would protrude into the mounting lugs for the brake caliper. The simple solution would be to offset the motor with spacers, however I'm already pushing it as the motor is 139mm wide and the dropouts are 135mm wide in an aluminium frame. I could use a smaller locknut on the axle on the cassette side, but I don't yet know whether that will be possible with the chain on the smallest rear sprocket.
Is this a common issue or just because of the frame I've picked? I assume the mount and caliper might be spaced better on a mountain bike.
I think I need to move the disc 3.5mm inbound to compensate. Is it possible to machine the motor disc mount surface to accomodate? The disc mount bolts would end up with less thread to sit in and I'm not sure of internal clearnace with the ends of the bolts on the internal motor components.
Some pics to show the issue
If anybody has encountered similar issues, and managed to overcome them, any help or info would be appreciated. Thanks.
p.s. anyone know how to get embedded images to be not-humungous?
Where the disc would mount, it would protrude into the mounting lugs for the brake caliper. The simple solution would be to offset the motor with spacers, however I'm already pushing it as the motor is 139mm wide and the dropouts are 135mm wide in an aluminium frame. I could use a smaller locknut on the axle on the cassette side, but I don't yet know whether that will be possible with the chain on the smallest rear sprocket.
Is this a common issue or just because of the frame I've picked? I assume the mount and caliper might be spaced better on a mountain bike.
I think I need to move the disc 3.5mm inbound to compensate. Is it possible to machine the motor disc mount surface to accomodate? The disc mount bolts would end up with less thread to sit in and I'm not sure of internal clearnace with the ends of the bolts on the internal motor components.
Some pics to show the issue
If anybody has encountered similar issues, and managed to overcome them, any help or info would be appreciated. Thanks.
p.s. anyone know how to get embedded images to be not-humungous?