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My understanding is that the lock is made by Abus for Rad, with the Rad logo on it. On my Radster Trail the installation was much easier, no spacers and no fender mod.

Make the motor smaller and the internal stresses go up for the same torque, so longevity might become an issue. Also making it smaller means more issues with heat rejection.

No, that's the problem... I can drive my CT registered car in NY, but if I can't register my ebike in CT what happens when I bring it to NY? I can't register it in NY because I'm not a NY resident. We ran into this when my wife was looking into a Vespa-style scooter. No registration required...

If one jurisdiction requires registration what happens to visitors bringing bikes from other places that don't require registration?

The US is a patchwork of laws. In Connecticut, helmets are not required for motorcycles or bicycles (except for riders under 14), but are required for ebikes. In neighboring NY state helmets are required for motorcycles and class 3 ebikes, but not for class 1, 2, or unpowered bicycles (except...

At one point I read an article about the development of torque specs, that said most experienced mechanics will torque fasteners correctly even without a torque wrench. I have at least four torque wrenches and I use them, but not everywhere a torque spec is given... like others, I know what...

Speed limits would seem to make the most sense. Going over 28 mph on level ground? Write the rider a ticket for unregistered motor vehicle. But then you can go a lot faster than 28 mph downhill even on an unpowered bike, I can get up to 35 mph on a not too steep hill near my house, even...

Meanwhile, small plane pilots still argue about whether to use nautical miles and knots (which has advantages in navigation planning) or statute miles and mph (which makes explaining things to nonpilots easier). Most of the old measurements are based on powers or fractions of two (half inch...

I wonder why they say "not for RV use"... and one of the pictures on the linked page shows it mounted on a RV...

How about traveling 1800 miles for a test ride? My wife wanted a Zugo, but she's very short and wanted to be sure it would fit. The company had just reorganized and the only place we could see one was in Austin, TX, and we live in Connecticut. But I needed to go to Dallas anyway, so we flew...

We got this one to carry my wife's Zugo on our camper: https://www.amazon.com/dp/B0BL6QCSTK?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1 It's worked pretty good so far... but now that I got a bike too, I gotta look for a double rack.

If it's only (or mostly) happening in wet conditions, probably something is getting wet and shorting out. Next time it happens, look the bike over and look for wet electrical parts. If you find a wet connection, dry it out and see if it starts working again. Then think about how to seal it to...

Quick ride after work last night, this is in the woods about a half mile behind the house.

The amount of torque that can be transmitted without excessive wear or outright failure. Typically a sprocket manufacturer (at least in the industrial world) will publish tables of the allowable power their sprockets can handle at various rpm. A larger sprocket can handle more power than a...

Wow, that's pretty extreme. But yes, when designing chain or belt drives there is a correction factor for the amount of wrap around the smaller sprocket or pulley. It takes into account the strength of the teeth and also the reduced radial force holding the chain or belt into the grooves...

It's not about how much of a workout I get, it's about how fast I have to pedal to maintain higher speeds even in the top gear. I find myself varying the PAS from 0 to 3, usually 1-2, depending on the slope. All the class settings do is control the speed where the motor cuts out, and disables...

Must be one hell of a helmet...

Not quite sure what you mean by "shift the chain right off a too large chainring"? Where does the strain gauge measure the deflection? Is it inside the hub or at the crank? A true torque sensor at the crank would have to be rotating but I see no evidence of sliprings, unless it's just...

CT and upstate NY. Supercubs are cool, but right now my other ride is a Rose Parrakeet.

Can you elaborate on that? I'ma an engineer so I understand gear ratios, torque, and power, etc., I've designed a lot of geared systems, but I know a bit less about the actual practice of bicycle gear design. If, say, I have a 10% larger chainring, then I would be pedaling slower but with...