OEM Gates motor pulley for the Surron Light Bee X, the Segway X160 and X260, and the Surron Youth. Number 4 on the parts diagram. Note that the Gen2 pulley has a lip on one side only.
The pulley is the driving end of the primary belt and its teeth round off over time, especially once a belt has been run slack. A worn pulley will skip a new belt exactly as it skipped the old one, so when the drive bangs on takeoff the pulley is as likely to be the cause as the belt.
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You can still order it now — it’s expected to ship in about .