HUNTS YOU THROUGH THE DAY. The KTM eHardtail range offers a balanced handling package, well thought-out specs, and different wheel size options.he BOSCH PERFORMANCE LINE CX motor and the most powerful BOSCH POWERTUBE battery ever (750WH) provide massive support. The models 691 and 671 are delivered with a 625WH SMART SYSTEM battery. With the self-contained BOSCH SMART SYSTEM, you are ready for the digital future. In addition, the EBIKE FLOW APP opens the door to the digital world and connects you with your bike. Thanks to the masterful work of our engineers, the proven KTM frame geometry has been retained despite the increase in battery size and capacity. Removing and reinserting the battery is easier than ever before. POWER TUBE TOP LOADER (PTTL) is the name of KTM's own innovation for this user-friendly battery handling.