bikefisherguy
New Member
Respectfully, you have no idea what you're talking about. Your logic is flawed. You are comparing apples to oranges
Bosch CX gen 4 swap for gen 5?
- Thread starter nickf
- Start date
Thanks for the respect, but I’m 100% correct. E-bikes are certified as vehicles, as a system. Any major modification - like a different engine, driving wheel size etc, requires recertification, and that is why bike brands and Bosch don’t do it. Even a like-for-like motor swap has a lot of paperwork around it to be able to reinstall the replacement motor.
If I want to modify my car, I can and it just needs an engineer’s inspection. I agree, the two paths are very different - that’s what I was pointing out.
Lots of love, a Bosch-certified mechanic who does this stuff for a job.
Cyclopathic
Active member
Again, I hear you. But, they design in changes in bolt patterns etc again to ensure they renew life cycles and sell newer motors and help manufacturers sell new bikes.
I don't blame Bosch, this is the same with many of the Bike industries circling 'standards', which they change to sell new bikes, wrapped up in marketing that they give noticeable mechanical advantage.
Someone will sort the G4 to G5 conversion soon, I'm sure. I'd try, but I don't have the time (or patience lol)
Cyclopathic
Active member
That's a bit harsh. To me, he makes logical sense, and what he says is true to the examples given, it's just not what you and I see as the key issues here.
- Thread starter
- #35
For anyone who's still considering trying to swap their old gen 4 motor for a new gen 5, someone has done it here swap gen 5 motor
Cyclopathic
Active member
Sadly not. He's confirmed G4->G5 isn't possible. His is G2->G5
- Thread starter
- #37
You may be right, but he referred to gen 2 frames - not gen 2 motors. Also he was fitting his new motor into a 2019 Trek Powerfly rather then a Rail, so the motor orientation and mountings are not the same.
However, he does seem to mix his terms so it is a bit confusing. My 2022 gen 2 Rail has the gen 4 Bosch motor.
Cyclopathic
Active member
Interesting! I hope you're right! I'll message him!
The motor casings are different, different internals, materials, weight, features, design etc. The bolt pattern changed becuase it needed to to accommodate the improvements. Not everything is Big Ebike trying to stick it to customers.
