This torque shaft can only be used on the Bafang torque controller, can not be installed on the center motor, if you are not the Bafang torque controller can not be used, the plug is 6PIN plug. The opening width is 73mm, only an additional washer can be installed on the 68mm frame, and the total length of the central axle is 148mm The center bracket model : SR PA231.32.ST.C This shaft torque sensor requires a dedicated chainring bracket

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