Bafang BBS02: Speed Sensor Alignment

My friend Gee’s bike is a Terry Symmetry, designed for (small) women, which poses challenges when mounting “normal size” components. The Bafang BBS02 speed sensor mount (with a reshaped nut) requires far more clearance between the chainstay and the wheel spokes than the Symmetry has:

Bafang BBS02 Speed Sensor - OEM bracket
Bafang BBS02 Speed Sensor – OEM bracket

The chainstay is nearly parallel to the spokes, so the sensor fits equally poorly anywhere its cable will allow.

The obvious solution is to reverse the mount and stick it to the outside of the chainstay, but it’s not mmmm symmetric: the other end is closed. Use a pull saw to cut off the closed end, stick the sensor post in the other way, and then it fits fine:

Bafang BBS02 Speed Sensor - reversed bracket - top
Bafang BBS02 Speed Sensor – reversed bracket – top

The sawed-off mount is visible from below:

Bafang BBS02 Speed Sensor - reversed bracket - bottom
Bafang BBS02 Speed Sensor – reversed bracket – bottom

It looks fine from the outside:

Bafang BBS02 Speed Sensor - reversed bracket - left side
PXL_20210620_160950653 – Bafang BBS02 Speed Sensor – reversed bracket – left side

Mad props to Bafang for the LED showing when the magnet is properly positioned.

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