Amazon.com : Bezior Electric Bike X1500 for Adults, Foldable 26" x 4.0 Fat Tire Electric Bicycle, 1500w Motor 48V 12.8Ah Removable Lithium Battery, Shimano M2000 27-Speed Gear and Dual Shock Absorber Ebikes :
Five simple upgrades for making a cheap second-hand bike a joy to ride | Cycling Weekly