Bosch Gen 4 Motor Noise

[Rob Rides EMTB]

Hey,

Just a note to everyone thinking about Bosch Gen 4 powered bikes. All of them that I have tested have a knocking sound over very rough stuff when the chain isn’t engaged (ie freewheeling over larger rocks and bumps). I believe it’s inherent to the design. It sounds like cable slapping inside he frames but is infact the motor.

Has anyone else ridden one (and noticed?).

 

[preedy62]

I've noticed this on my Trek Powerfly 7. I thought it was the battery rattling but have isolated the noise to be when the motor is not under any load and the bike is freewheeling over a bump. It's a bit irritating The motor is great though and the increased battery is a plus.

Keep pedalling!

 

[Doomanic]

I've ridden three (on the same day) and they all sounded different. One sounded broken so that may be the noise you're referring to.

 

[Dirtnvert]

Sounds like ski touring bindings. Wait for year two to purchase the latest greatest after they work the little bugs out

 

[Number29_NZ]

Good video here, old mate does a good job in showing the noise.
this would be a deal breaker for me.

 

[Bartbeemer]

This was also a deal braker for me. Owned a Powerfly 5 with the previous cx and found this already noisy. When I tested the new CX I was very disapointed and went for Brose/specialized. What a difference.

 

[Doomanic]

Of course the Spesh is quieter; it’s usually broken...

 

[Strugglinon]

Got my 160 SL going back to the shop next week for exactly this reason. Not impressed

 

[MrBrownstone]

Can’t have that.

 

[Vampiszon]

This is also the case on my Cube Acid Hybrid Pro with Active Line Plus and on my wife's Scott with Active Line engine. The bikes are form 2019, so I think they're Gen3? (not sure). I think all Bosch engines are designed this way. It's annoying on bumpy road I don't think it can be fixed on warranty. Here is my video showing this issue: