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If you fall in between sizes
XS/S SIZING:
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Replacement magnet for your eBike's speed sensor
and 3 series
Ultra Motor Main Gear model version_Other Beasts If you fall in betweenDirect replacement main gear for Bafang Ultra M620 mid drive motor systems. This OEM spec component restores full drivetrain engagement and torque transfer when wear or damage compromises shifting performance or power delivery. Essential maintenance part for riders relying on consistent motor responsiveness. Fits Bafang Ultra M620 motors. Verify compatibility with your motor generation before ordering. Installation requires motor disassembly and
US$ 51.00
US$ 10.30
US$ 86.03
