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My BMC City Ltd weighs 38 pounds with a 504wh battery.

Carbon steel frame? Why? To support the battery?

How does a 4x4 ATV rank as an EBike?

With mechanical brakes you have to adjust cable tension that adjusts the outside pad. You have to adjust the inner pad with an allen wrench from the other side of the wheel. A lot of people don't even know about the inner pad adjustment, so have major issues with brake tension and can even warp...

If the disc brake is on the left side, then something is drastically bent.

That's not a motor problem, that is a wiring issue. The cord must be replaced.

Elevations in Florida is hilarious!

You get to pay less when you buy a generic parts eBike, now you see what happens when you need parts. I assume you called Ride1Up? I had my Magura lever in 2 days. I just Googled Jet brake levers and got pages of places to buy parts.

Maybe I missed it, but how good of a bike mechanic and electrical troubleshooter are you? How good are you at patching tubes? In 5 years I would put on about 13,000 miles. That means 2 sets of new tires, maybe 3 sets of new brakes, at least 4 chains, new cassette or 2, new chainring, and...

Nothing "seated" in the caliper. You simply pushed the piston and seals back into the caliper bore.

Striking the axle would be bad for the bearings because of brinelling. Just a simple loading from a lever will not damage them one bit. A couple of load cycles will never cause metal fatigue. If it did, all bicycle bearings would quickly die after jumping a few curbs. I was an engineer at...

Battery range goes down exponentially above 20mph. The aerodynamics of the human body are not good.

Did you get an update on your firmware? I thought new generations of Bosch motors went into limp mode after people tried to override the software?

It will take a frame that allows a tire that wide. It's simple to measure.

I have a hard time understanding how a 2 wheel bicycle that requires great balance and that can go 20mph is a mobility device for a disabled person. The 5mph limit makes a lot more sense to me, as well as using a 3 wheel device should also be safer. I love the idea that everyone can get outside...

Overheating can melt the varnish on the windings on the armature and render the motor useless.

Please watch the dates of the posts you reply to, this one was from Sep 2016

I believe the OP confuses the subtle differences in eBike companies today. So many of the small companies are just importers and shippers. They receive eBikes in boxes and ship eBikes in boxes. That's it. All the technical work, including engineering, is done in China. Nothing is engineered here...

Specifically, what kind of help did you want or expect? When you buy a car and a mid year release of the next model year has improvements you like, do you contact the dealer and ask for help? I do get irritated when someone presents an issue that smells of entitlement. You bought a bike and now...

"No help" because the Chinese engineers didn't allow for updating past models, or "no help" because they didn't tell you want you wanted to hear? You emailed and they replied, sounds like they helped.