Trek District+ 4 Coaster LowstepThe District+ 4 is a sleek and capable city e bike with rugged durability and top end comfort. Its frame semi integrates the batteries inside the downtube and comes with four battery capacity options ranging from 400 to 800 Wh, so you can choose what's right for your commute. This District+ features coaster actuated hydraulic disc brakes for effortless and reliable stopping power. Bosch's new smart system allows your bike to pair with your smartphone