Looks like it’s a hit and miss issue. My new Cannondale Habit NEO definitely has the clunking problem. Several folks have done YouTube videos on the noise but no one has posted a remedy for the issue. Anyone have THE cure? I’ve taken a link out of my chain but it’s still making the clunk. It’s only when the bike is costing over ruff terrain...
Only clunks when freewheeling. Completely silent when pedaling and it has a load on it. All cables and batter checked and tightened so no slop. It is definitely coming from the front ring/internal gear. Seems like it will need a shim or some type of gear resistant to keep it quiet.
It's a known issue with these motors.
The following is Bosch's offical response, but if you don't want to read the whole thing, in summary they're saying "oh well, tough sh*t".
"When riding an eBike/eMTB on rough and technical terrain downhill, vibrations of the chain/chainring often occur. Those vibrations can be transferred to the frame, the drive unit and to the inner gear wheel (inside the drive unit). In some cases when freewheeling, a metallic sound can be generated when the inner gear wheel is not under load. How much vibration and sound is transferred depends on the type of bike (for example hardtail vs full suspension and aluminum vs carbon).
The current Performance Line CX is designed with high power density and thermal stability as well as a highly efficient gearing mechanism and incredibly smooth-running gears. Paired with reduced weight, lower wall thickness and improved heat release it is easier for mechanical noises to be omitted. Therefore the noise may sound a little more prominent when compared with other drives. This noise does not have any influence on the performance, functionality or reliability of the motor. Usually an eMTB also makes several other noises as it navigates these technical sections of trail (tyres gripping/skidding, chain slapping etc) and thus any noises from the motor are drowned out.
On further request: We would also like to note that we continuously develop our products. This includes looking at whether this specific noise can be reduced in the current Performance Line CX."
Best Regards
Your Bosch eBike-team
The following is Bosch's offical response, but if you don't want to read the whole thing, in summary they're saying "oh well, tough sh*t".
"When riding an eBike/eMTB on rough and technical terrain downhill, vibrations of the chain/chainring often occur. Those vibrations can be transferred to the frame, the drive unit and to the inner gear wheel (inside the drive unit). In some cases when freewheeling, a metallic sound can be generated when the inner gear wheel is not under load. How much vibration and sound is transferred depends on the type of bike (for example hardtail vs full suspension and aluminum vs carbon).
The current Performance Line CX is designed with high power density and thermal stability as well as a highly efficient gearing mechanism and incredibly smooth-running gears. Paired with reduced weight, lower wall thickness and improved heat release it is easier for mechanical noises to be omitted. Therefore the noise may sound a little more prominent when compared with other drives. This noise does not have any influence on the performance, functionality or reliability of the motor. Usually an eMTB also makes several other noises as it navigates these technical sections of trail (tyres gripping/skidding, chain slapping etc) and thus any noises from the motor are drowned out.
On further request: We would also like to note that we continuously develop our products. This includes looking at whether this specific noise can be reduced in the current Performance Line CX."
Best Regards
Your Bosch eBike-team
Posiadam trzy rowery Cube Cross Hybrid Pro z silnikami Bosch Performance Line 4 (85Nm) zakup IX 2020r. pierwszym przy przebiegu 1890 km wymieniony silnik ze względu na głośną prace łożysk, a teraz kolejny rower przy przebiegu 3200 km. ta sama usterka. Mam pytanie do zespołu eBike czy tego typu usterki występują w często w tych silnikach?. Całe szczęście, że jest w okresie gwarancji ale co później? Może czas wprowadzić zmiany konstrukcyjne by wyeliminować usterki .
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Translation on the above post for @AC62
"I have three Cube Cross Hybrid Pro bikes with Bosch Performance Line 4 motors (85Nm), purchased in IX 2020. the first engine with a mileage of 1890 km was replaced due to the loud work of the bearings, and now another bike with a mileage of 3200 km. same fault. I have a question for the eBike team, are these types of faults common in these motors ?. Luckily it's within the warranty period, but then what? Maybe it is time to introduce design changes to eliminate the defects."
Cześć, możesz napisać coś więcej odnośnie głośnej pracy silnika z powodu łożysk? Mam wymieniony silnik Boscha w moim rowerze i odnoszę wrażenie że pracuje zdecydowanie głośniej niż poprzedni dlatego zastanawiam się czy nie mam tego samego problemu co Ty.
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