Recent content by sleepy_tired

I think you could replicate the benefits of having a 2-speed just by using a larger motor with a faster wind. Also the effect of field weakening on a modern IPM motor design is very different from something like a direct drive hub motor. I think that it some cases it can actually increase...

3-wheelers are inherently unstable. If high performance is your goal then it is a lot better to go 4 wheels. There are potential benefits to 3 wheelers, but handling performance isn't one of them. This is why, historically, people used three wheelers for reasons unrelated to performance...

What you really want is a watt-meter that records how much energy your motor controller is using. This way you can log the energy usage do simple math to convert it to watts-hours per mile or kilometer and try different techniques to maximize range. That way you can eliminate the guesswork and...

Good you caught it. I had a pad that got twisted somehow and caused a blow out while going fast down a hill carrying a bunch of groceries. It worked out ok, but there was no fixing that flat. Sucked having to wait for a ride with a bunch of groceries on the side of the road. Ruined a nice tire.

Unless you want a lot of power there isn't anything wrong with a front hub motor. There isn't any real benefit going for a rear motor until you get up past 750-1kw or so. Over 350 watts output you'll probably want a torque arm if one isn't built into the motor. Just to prevent possible damage...

LMX is one. Started off in endless-sphere forums, I believe. There is a second one that has a left hand belt drive that I saw in a video, but I can't find it right now. Well yes. That is what I said in my previous post. Slowly crawling up hill isn't a problem with e-MTB. If you have to...

Anybody who loads their bike onto the back of the SUV to go to their favorite "riding spot" is more of a cheater then any ebike rider. Anybody who loads their bike onto the back of a pick up so they and their buddies can ride to the top of a mountain bike trail is much more of a cheater then...

I expect that one of the reasons they like those tires because it's expected to last the lifetime of the bicycle. Were as normal tires need to be replaced periodically. They can just shove the bicycle out into the public and those tires will just last until the bicycle disintegrates. No need...

It doesn't matter so much which one produces more heat. The problem is that the heat has no where to go with a geared hub motor. You don't need to have multi-speed transmission to have efficient drive. This has been known by EV designers for almost half a century at this point. Probably...

lol. As far as high vs low center of gravity. Imagine you have a stick with a weight on one end. Imagine balancing that upright on one finger, like most kids do. Is it going to be easier to balance when the stick is 3 inches tall or 3 feet tall?

I think so as well. It's a safe choice and a robust small motor. If the electronic freewheel feature of the Gmac is attractive then I suppose you could get the same thing done for the SX2 if you are ordering a bunch of motors. This way you can get your start and see what it's like selling...

I am talking about only slightly above bicycle speeds ~30mph when talking about ebikes made from bicycle parts. Especially in the context of rolling resistance and traction. It doesn't make sense that you'd bring up a 100 pound bike going 60 mph while using safety in the same paragraph. Even...

Generally speaking things like stopping distance and hard corning capabilities is a function of the amount of friction the tires have on the surface. There are complications to simple concepts because of how tires different tires can bend and twist to conform to surfaces... but generally...

One of the big problems is that due to natural human perceptions we interpret high vibrations with 'fast' and low vibrations with 'slow'. So stiff road bikes with rock hard tires are going to tend to "feel" faster. Also there is real advantage in having low-mass wheels when it comes to...

On a technical level Fiberglass can easily be stronger then Carbon fiber composite. Most Fiberglass that gets used is E-glass, which is a inexpensive form originally developed for use in the electronics industry. Higher 'engineering' grades of Fiberglass, like S-glass, is stronger and more...