X-Treme The Electric XB-310Li X-Treme - Folding Electric Mountain E-Bike BicycleThe XB-310Li is a Lithium Battery powered Electric Bicycle capable of folding in half for easy transportationIt runs on a 300 Watt rear hub motor. The folding electric mountain bike is great for RV'ers, campers, college students and anyone who wants a lightweight foldable mode of reliable transportation.