Dionigi
Well-Known Member
- Region
- USA
- City
- Santa Cruz & Pittsburgh
I’m not sure if I have ever felt as unsafe on a bicycle as I do on my Bosch Performance CX/Rohloff E-14 ebike.
A little history: For the first 400 miles the E-14 powertrain worked well, although stiff. Since then there had been a series of malfunctions that has brought to the surface the warts of a first generation electronic control system partnered with a 25 year old gearbox design. A gearbox that was originally designed for an unassisted pedal powered touring bicycle.
The major issue is gear freewheeling. By freewheeling I mean when engaged in any gear then shifting down one gear the pedals spin with no power and no gear engagement. An incredible feeling of helplessness on the road.
There are other minor issues that add to an insecurity in the system, like if you roll the bike backward unpowered the system will power up. But only in the lower 7 gears and not in the top 7 gears.
From what I can see this is Rohloff’s first venture into electronics and it looks like they hired a freshly minted EE out of Strasbourg State Polytechnic to design the control system. This type of electromechanical interface failure was common in the 1970s but unacceptable today.
Bosch and Reise and Müller should have known better. The bottom line is the Rohloff E-14 and Bosch Performance motor is a stopgap for future electric bicycle power and control systems. And I should have known better.
On the positive side I have a very proactive and responsive bike shop dealer and 8 months to have these issues resolved. Hopefully it is just a mechanical failed Rohloff Speed Hub and the electronics can be stabilized by firmware.
A little history: For the first 400 miles the E-14 powertrain worked well, although stiff. Since then there had been a series of malfunctions that has brought to the surface the warts of a first generation electronic control system partnered with a 25 year old gearbox design. A gearbox that was originally designed for an unassisted pedal powered touring bicycle.
The major issue is gear freewheeling. By freewheeling I mean when engaged in any gear then shifting down one gear the pedals spin with no power and no gear engagement. An incredible feeling of helplessness on the road.
There are other minor issues that add to an insecurity in the system, like if you roll the bike backward unpowered the system will power up. But only in the lower 7 gears and not in the top 7 gears.
From what I can see this is Rohloff’s first venture into electronics and it looks like they hired a freshly minted EE out of Strasbourg State Polytechnic to design the control system. This type of electromechanical interface failure was common in the 1970s but unacceptable today.
Bosch and Reise and Müller should have known better. The bottom line is the Rohloff E-14 and Bosch Performance motor is a stopgap for future electric bicycle power and control systems. And I should have known better.
On the positive side I have a very proactive and responsive bike shop dealer and 8 months to have these issues resolved. Hopefully it is just a mechanical failed Rohloff Speed Hub and the electronics can be stabilized by firmware.
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