Hi all,
Got a 9C RH-212 from ebikes.ca awhile back and finally have some time to mount it correctly. Noticed it is difficult to align in my frame - it appears to be designed for 135mm dropouts and the drawing indicates 41mm for the cassette - but there is a stand-off at the rear of the freehub (closest to the motor) that spaces the cassette a couple mm off. Normally this wouldn't bother me at all, but once mounted the smallest cog is striking the frame. The provided 3mm thick washer with 10mm flats doesn't fit through the cassette lockring - so will need to remove ~1.5mm off the diameter of that, removing its yellow zinc coating (given standard lockring dimensions, this part seems designed to not fit). Even once the washer is in place I suspect the cassette will be too close to the frame to use the smallest cog so I'm also grinding ~1.5mm off the step at the rear of the freehub so the cassette moves further down. If needed I'll also grind a bit off the lockring but I think everything should still mount. I suppose I could add washers but I'm already pulling the frame a couple mm to mount it this way with just the single washer on the cassette side and don't want to push my luck with Al frames. Seems like a nuisance. Is that normal for this motor? Have others had to do similar tweaks or is my axle somehow off - I'm pretty sure it's not adjustable like the old cup-cone ones might have been.
Thanks for any feedback -
Markus
Got a 9C RH-212 from ebikes.ca awhile back and finally have some time to mount it correctly. Noticed it is difficult to align in my frame - it appears to be designed for 135mm dropouts and the drawing indicates 41mm for the cassette - but there is a stand-off at the rear of the freehub (closest to the motor) that spaces the cassette a couple mm off. Normally this wouldn't bother me at all, but once mounted the smallest cog is striking the frame. The provided 3mm thick washer with 10mm flats doesn't fit through the cassette lockring - so will need to remove ~1.5mm off the diameter of that, removing its yellow zinc coating (given standard lockring dimensions, this part seems designed to not fit). Even once the washer is in place I suspect the cassette will be too close to the frame to use the smallest cog so I'm also grinding ~1.5mm off the step at the rear of the freehub so the cassette moves further down. If needed I'll also grind a bit off the lockring but I think everything should still mount. I suppose I could add washers but I'm already pulling the frame a couple mm to mount it this way with just the single washer on the cassette side and don't want to push my luck with Al frames. Seems like a nuisance. Is that normal for this motor? Have others had to do similar tweaks or is my axle somehow off - I'm pretty sure it's not adjustable like the old cup-cone ones might have been.
Thanks for any feedback -
Markus