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I have the Blix Vika+ and it meets all of your requirements except the 45 lbs weight. It weighs about 52 pounds. It's been a great bike and I've had it over a year and put 800 trouble free miles on it. https://blixbike.com/products/vika-electric-folding-bike

I posted that comment above stating that the upshift thumb lever was balky on my new shifter and that it might be a cable problem. Well, the internet to the rescue again. I did find a number of people had similar problems and lubed their cables, etc. But then fell upon a guy that fixed his...

I looked at doing this too. I found that it was doubtful a 50T-52T chain ring would fit without contacting the chain stay. I used a Hybrid Bike for my electric build and it has a more MTB style frame. Road bikes can easily accommodate 50T chain rings due to thinner frames including chain stays...

I could have and did so for 350 miles of riding. But, as i said, the 8th gear on my 9-gear freewheel was 14T and it couldn't keep up with the motor. I wanted to be able to pedal and feel like my effort and the motor were what was moving me forward. And, I'm sure there was some stubberness on my...

FIXED! The new DNP 8-speed freewheel and Shimano 8-speed shifter has completely fixed the issue. I figured the 8-speed freewheel would be shorter over all. But the 8-speed DNP and the 9-speend Sunrace were pretty much the same height. My rear derailleur is a Shimano 9-speed Alivio but after...

Try this video - it is pretty clear.

I've ordered a DNP 8-speed freewheel. And to make the gears index appropriately I ordered an 8-speed micro shifter as well. Both will be here tomorrow (Sun 3/14). So, we'll see if this solves my problem. The current Sunrace freewheel has a 13T low gear and I'm currently not able to use it at...

I attempted a rough measurement of this today. It's difficult to do accurately. I measured from the center of the hub of the original wheel to the outside of the 9th gear on the cassette and then the same for the motor hub and freewheel. The hub motor/freewheel combined are about 20mm wider...

I've been looking at this and I've found used 8-speed Shimano XT RD and MicroShift for not much money at all. The only real issue with the number of gears is running PAS 2 or 3 and wanting my pedaling to play a roll. Another route may be that bigger chainring I had thought about previously.

Not sure. It still fits in 135mm dropout... barely. The freewheel is about 6 mm taller than the cassette. I haven’t measured the overall width.

Another day another round of checking and trying different approaches. First I check the derailleur hanger and found it a little bit bent. Probably not enough to cause an issue. But test it and attempt to straighten it I did anyway. Then, since I knew my chain was too long and it had dropped...

Thank for that prospective @JES2020. Maybe it's not that. But I plan on taking a look at that chainring to see if it can be mounted differently. I worked on derailleur limit adjustments yesterday. Something I noticed, when adjusting the chain for 9th gear the limit screw is backed off of the...

This^ Bent derailleur hanger or even bent derailleur.

I think that maybe I found the issue for my chain skipping in 9th gear only... and it's not the freewheel. Well, it is sort of. Here's what I know think is the issue. CHAIN LINE - The new freewheel is taller, or more likely the motor and freewheel together are farther out from the center of the...

@harryS Thanks for the photos. The top spacer I have in place and the washers I purchased at HD did go under the freewheel.

I DIYed the kit, including installing the original freewheel. So, all this work with the new freewheel has also been a DIY project. I did take the bike to a bike shop in Tucson to have it looked at. I didn't have an appointment but the shop owner was kind enough to work through some obvious...

Best laid plans. That didn't work out. One washer was too few and three were too many. Two seemed just right until the test ride really tightened the freewheel and it quit spinning. With three washers in place not enough of the freewheel was screwing on. Just a couple of turns and it was done...

On a trip to Home Depot with the freewheel in hand I found a flat washer that fits pretty well at 1.25" in diameter with a .75" hole in the center. The washer is a nearly perfect fit with just a tiny bit of loose play. I purchased 4 of them and they are about 1 mm thick. Also, it occurred to me...

It’s occurred to me that, even though the first freewheel doesn’t bind when tightened that it too may need a spacer and that this is the reason that the high gear is skipping. Maybe?

Thank you!. I also just found a 2mm space for an eBike hubdrive freewheel on Grin Tech's website. I'm not sure which I need. I'll have to figure that out. https://ebikes.ca/freewheel-spacer.html