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1.Why choose rear screw motor instead of cassette motor?
Compared with rear screw motor,cassette motor will brake easily.That's why other stores also don't provide the cassette motor shipped from oversea warehouse.If you surely need the cassette motor,It need pay extra 10 USD and only can be shipped fron China.Now the delivery time is long about 40-60days.We suggest you choose the motor that shipped from oversea warehouse and pay extra 20USD to add a freewheel shipped from China