What is the expected lifespan of the Bosch drive unit?

[Luv2ride]

I have two bikes and six batteries, friends regularly ride my second bike. Four of the batteries are from 2016-17 and two are from 2022. Three of the four older batteries have lost about 20% capacity and one 50%.

 

[Ravi Kempaiah]

View attachment 168342

This is very impressive!
The motors last a long time. One of the few instances where it runs into issues is in very humid conditions, i.e., coastal areas with seawater - this can damage the bearings and lead to rust/corrosion.
In motors equipped with internal belts, timely replacement of belts will help you get high mileage.

 

[peterh_nz]

motors equipped with internal belts, timely replacement of belts

Do some Bosch motors have internal belts?

 

[Ravi Kempaiah]

Do some Bosch motors have internal belts?

Brose has internal belts and they require replacement every 8-10k kms.
Bosch has nylon and metallic gears.

 

[peterh_nz]

Brose has internal belts and they require replacement every 8-10k kms.
Bosch has nylon and metallic gears.

As I thought. Thanks

 

[PHXRDR]

I'll weigh in...
4 year (plus two week) old Gazelle Ultimate T10 at 27,000 miles.
Never let it get wet. High cadence riding style.
Garaged in an air conditioned apartment (in Phoenix).

 

[Brendon@OEB]

The only drive unit failures for Bosch happened one time on a bike that had really low miles. There was an internal programming issue and Bosch sent a reman DU to replace. Bike was well outside the warranty and it was a Bosch goodwill repair.

Other than that we've seen bikes well into the 10's of thousands of miles with no problems.