There were Gen 1, 2, and 3, and the current is Gen 4. The generations before 4 used a very small chainring (such as 16 or 18 teeth). These older Bosch motors were believed to create the motor drag. I don't know. If you can raise the rear wheel, try to rotate the crank with the assistance OFF. Do you feel any resistance? No? Then the reason of your Kalkhoff slowing down is elsewhere.It's Bosch Performance Line, it says Bosch eBike System 2 on the website, not sure that's what you mean by generation
After given it some thought, it is very strange what you are describing. If you ride downhill and don't pedal, there is a freewheel in the rear wheel hub that cuts all the interaction with the drive-train. So, coasting or descending are not dependent on the motor at all!but _something_ on that bike is pulling back.
Well its worth a try,I got on an unserviced "acoustic bike yesterday and my legs gave out immediately, didnt breathe hard it was like my legs had no strength and I do ride on hills sitting down with low pedal assist, the thing is those heavy ebikes pedal easier. with little or no assist with properly inflated tyres. Get a small tyre pump (Ryobi makes a nice one with built-in digital pressure gauge. And a good BS can tune your bike to its maximum performanceYeah no fat tyres. As Stefan noticed, my problem is mainly with the bike slowing down while not pedaling, so can't be the chain or battery. It must be the tyres which are under-inflated (I am pretty heavy) plus the baby seat I have in the back, and maybe the wheel needs some grease... I don't know. I probably bought it from a lousy website that didn't mount it well. I'll have it serviced maybe...
Maybe check for brake misalignment/drag, too.Yeah no fat tyres. As Stefan noticed, my problem is mainly with the bike slowing down while not pedaling, so can't be the chain or battery. It must be the tyres which are under-inflated (I am pretty heavy) plus the baby seat I have in the back, and maybe the wheel needs some grease... I don't know. I probably bought it from a lousy website that didn't mount it well. I'll have it serviced maybe...
Have you tried taking the chain off your chainring and rotating the crank by hand?I have Bulls Lacuba Evo 2017 or 2018 with Brose T motor. With motor off, I can't go even 5 km/h - it's so (extremely) hard. Maybe my motor it's piece of junk , and you have newer versions of motors - because producers now advertise "no motor drag" and there is a reason they do it. I've red a few discussions, generaly with conclusion that it's a e-bike's weight. I do NOT agree. When I go, lets say 20 km/h, and turn off the motor (whole electric system), my bike goes well without pedalling, with very little resistance, slowing very slowly, I can feel that wheels work smoothly. But when I try to pedal, it's impossible to keep that speed, and it's very havy resistance, coming definitly from the turned-off motor. It's not a problem with turning the pedals, but it's problem when you push the pedals - that force you have to fight against comes not from fat weels, but from the motor. More force you put in, more resistant force you're facing.
I can guarantee Mat the 2017 and newer motors have no drag.
Again: Did you take the chain off the chainring, turned the motor on, and spun the crank with your hand?