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https://hallomotor.com/products/36v-1200w-48v-1500w-powerful-ebike-20-24-26-27-5-28-29er-inch-rear-wheel-conversion-kits
https://hallomotor.com/products/36v-750w-48v-1000w-powerful-ebike-20-24-26-27-5-700c-28-29er-rear-wheel-conversion-kits