Bosch has unveiled its first rear hub motor targeting the urban electric bicycle market. Moving away from a strategy centred on mid-drive systems for premium e-bikes, it is expanding into the urban e-bike segment that emphasises price competitiveness and a simpler structure.

On June 18, local time, electric vehicle outlet Electrek reported that Bosch unveiled a new e-bike drivetrain called Hub Line and expanded the scope of its smart system to hub motor products.

Bosch has built its position in the high-end e-bike market around mid-drive motors. Hub motors are widely used in urban e-bikes, but Bosch has not made a full-scale entry into the segment. That is because Bosch has previously focused mainly on large hub motors for electric scooters and electric motorcycles.

The Hub Line features a lightweight design tailored to urban commuting demand. The motor delivers up to 45 Nm of torque and weighs 2.3 kg. Bosch explained that it designed the system to adjust output according to a rider’s style by using multiple onboard sensors. For example, it supports smooth acceleration after stopping at a signal and provides a natural pedal-assist feel on gentle inclines.

Integration with the drivetrain has also been strengthened. Hub Line is designed to work with electronic shifting systems and also links with automatic gearboxes. The motor and drivetrain cooperate in real time to improve riding efficiency and convenience. This differentiates it from existing low-cost hub motors, which often operate separately from a bicycle’s gear system.

The exterior is designed to blend naturally with urban bicycle designs. The motor housing has a diameter of 100 mm, configured not to protrude noticeably from the rear wheel. Bosch presented it as a setup used together with its PowerTube 360 battery. PowerTube 360 is the thinnest battery Bosch has released to date. It weighs 2.1 kg and is 68 mm wide.

Bosch said the Hub Line and PowerTube 360 combination can provide a maximum pedal-assist range of 80 km. Actual range may vary depending on terrain, rider input and assist level.

Anti-theft features have also been strengthened. Bosch also unveiled an updated ConnectModule. The module combines GPS, cellular connectivity, motion detection and an alarm function to reduce the risk of bicycle theft. In underground parking lots or inside buildings where GPS signals are weak, it supports location checks by using Bluetooth low-energy tracking.

These connectivity functions are integrated into Bosch’s subscription service Flow+ and its smart system ecosystem. This will allow Bosch to expand the connected e-bike experience it offered in its mid-drive lineup to hub motor-based products.

Klaus Fleischer (클라우스 플라이셔), CEO of Bosch eBike Systems, said, "With new products centred on Hub Line, we are opening a new era for urban e-bikes." He added, "These products are light, agile and have a modern design, and will also change the urban riding experience itself."

The key is price. The hub motor-based urban e-bike market tends to be highly price sensitive. As Bosch products have traditionally been positioned at premium price levels, how manufacturers apply Hub Line across price points and product lines is expected to determine the pace of adoption. Still, Bosch made clear through this launch its intent to target the urban e-bike market by emphasising reliability, connectivity and anti-theft features.