I'd be more concerned that you are going to loose all ability climb hills, or at least without having to use the highest power setting to do so, along with the subsequent reduction in overall mileage per ride.
Connex seem to be the sprocket of choice for German e-mtb users, but Martin's sprockets also seem very good, and are I'm guessing about the same price when postage is taken into account. I could be wrong though.
I haven't seen him on here for a while, but WilliamTell from this forum is another Haibike owner who by memory was going to reduce his gearing from 18 teeth on the front, to my use of 15 teeth. The last ride that myself, SRS and William completed, William went onto a second battery, whilst I still had over half of my battery life remaining and the end of the ride. I can't remember the distance, but the ride length was somewhere between 28 and 34miles. Fitness did play a part, but I think that wrong gearing didn't help.
I haven't altered my gearing and don't intend to, but I would imagine that you would want to extend the chain length by the same amount of teeth, as per the change in sprocket size. If I haven't thrown them away, I might have half a dozen or so new chain links from a KMC ten speed chain somewhere that you could have. I'm getting through chains and sprockets/cassettes at quite an alarming rate, and will be changing again within the next couple of weeks, so there will be some more spare links then.
I'll check it out and let you know. As you say, hopefully knee is ok
I hope so, I'm taking the two bikes to Switzerland for two weeks, from the 10th of July. The first climb is 1,266metres, and much of it is 50% gradient. I did it last year on the borrowed pedal mtb, and just kept setting myself targets of reaching the next corner, bush or tree to push myself. That was the ride that had me spewing my guts up doing, so hopefully the e-mtb might make things easier.
The trouble is all of my work currently involves the use of ladders, and it's screwing up any chance of things healing properly.
I'm really looking forward to riding down this though. I've walked up and down it loads of times, but riding it is going to be a whole new experience. I'm aiming to ride it at least twice, once in the daytime, and once at night time when no one else be on the mountain.
Part one.
Part 2.
This is a real bastid to ride up, and is the hill that I was sick on. Annoyingly you get no impression of just how steep that it actually is. Riding down it last year with rim brakes, scared the crap out of me! The owner of the bike, looked horrified when I told him where I had ridden.