Conclusion by Max Fuchs, BIKE test editor
The Bosch Hub Line sounds like an exciting addition to e-gravel bikes. If the hub motor enables cheaper models to be produced, it could make e-bikes affordable for more people. However, only a practical test will reveal how the extra weight on the rear wheel affects the Crossfire R600’s handling.
An engine that disappears
The Hub Line delivers 45 Newton-metres of torque, weighs around 2.3 kilograms and, with a diameter of about 100 millimetres, sits inside the rear wheel hub – where it is barely noticeable. No bulky unit on the bottom bracket, no massive motor unit in the frame. The bike looks just like a normal bicycle.
A direct comparison with mid-drive motors is misleading in this context: a hub motor transmits its power directly to the rear wheel, without any losses due to a chain or belt. For lightweight city and fitness bikes, 45 Nm is therefore more than sufficient in almost all everyday situations.
Networked and updatable
As part of the Bosch Smart System, the Hub Line is fully connected: over-the-air updates, anti-theft protection, navigation and personalisation via the eBike Flow app are all part of the range of digital features. If you lend or sell your bike, you can block access to it. If you want a new feature, you’ll get it wirelessly – no need to visit a dealer.
The battery as an everyday solution
The key feature of the R600 isn’t the motor, but the frame. The 360 Wh battery can be easily removed from the top. CENTURION explicitly cites this as a response to customer requests: anyone who doesn’t have a garage and has to store their bike in the cellar or outside can simply take the battery into their flat and charge it from a socket. Bosch states that the range with Hub Line and the 360 Wh battery is around 89 kilometres in Eco mode – enough for several days of commuting without recharging.
Two versions, one frame design
The Crossfire R600 is available exclusively with a diamond frame – in keeping with its sporty gravel bike character. There are two versions to choose from. The R600 D is the entry-level model, priced at 2,749 euros. The R600 D EQ is priced at €2,849 and comes fully equipped for everyday use as standard.
We’d also like to hear your views: hub motors in sporty bikes – does that make sense in terms of riding dynamics? Please feel free to share your thoughts in the comments section!
Max Fuchs
Editor
