Search results

take a look at the ourworldindata link. the numbers aren’t quite that extreme, and it seems a well documented source. i agree that aviation, marine, and other industrial uses are going to be difficult. other transport is relatively easy as is electricity for general purposes.

more questionable numbers. here are the real ones 3.2 trillion miles driven in the USA per year. this figure is widely available. a good electric car can be expected to get about 4 miles per kwh in the near future. many already do better than that, some worse. assume 10% energy loss (DC fast...

where do you get this? many different sources show wind and solar at around 15% of electricity generation, up from basically zero just 15 years ago. yes, a long way to go but solar capacity is increasing incredibly fast, especially outside of the US. even using the more general definition of...

there was an interesting discussion here https://forums.electricbikereview.com/threads/another-new-tq-motor-hpr40.57935/page-13 about climbing hills on lightweight hub drive and mid-drive motors, especially the new TQ HPR40 which looks very, very promising, and @Yako is currently riding. i...

but the bike already has BLE. it’s really just a need for / use of a standard profile for BLE. this already exists for many bluetooth fitness devices - like cycling power meters. phones have bluetooth. smartwatches have bluetooth. bikes have bluetooth. cycling computers have bluetooth. other...

yeah, it’s kind of an interesting artifact of where we are in the technology landscape. the ANT standard has been around a long time, and it’s very, very simple. European regulations around wireless communications require encryption going forward (EU RED) which would be difficult to implement in...

the 4 and 4.1 meter/wh values are very interesting. if you’re doing half the work yourself, and the total load is 125kg, that’s 70% efficiency! of course it could be way more or less if you were going fast or doing less/more of the work yourself.

when you consider that the cheapest accurate power meters on the market cost quite a lot more than mahle’s entire bottom bracket with the sensors (which is very cheap - $200 at retail) it makes sense that it’s a blunt instrument. given similar experiences with the specialized ones (which at...

i just don’t believe that the TQ40 is only 65% efficient. so far we have a test report that seems to show 65%, specialized claiming it’s 65% (lol, wouldn’t trust that one) and TQ claiming it’s 90%. that 65% test showed a peak of 250w output power (isn’t supposed to max out at 200?) at 400w...

i didn’t realize that was your review ! fantastic and thank you for producing it, lots of work no doubt. the rider input number in the mahle app is total nonsense, it comes from some kind of sensor in the bottom bracket and is way off. i can say this pretty definitively since i moved the...

Cool review. It appears he used about 75% of the range extender (100wh ISH) tooling around and then getting to the top of a 1300’ (or so) climb. More or less tracks with what you’d expect, depending on how much he used before going up. He also notes that he did it on level 2, but i don’t think...

i’ll add that canyon uses roughly the same 6,000 foot metric that we arrived at in their literature, noting that the range extender exists to let you exceed it….

yes, but only if you only use the assist on the climb. using assist on flats just makes you go marginally faster at a high energy cost. if you use strava and a power meter (a real one, not their estimate) you can see the total energy of a human powered ride and spitball what level of motor...

those are nice rides, that was kind of my sweet spot too, 50-60 miles and 3000-5000 feet. you don’t want to arrive home at 0% (and most systems will stop putting out full power before that) so another 5% is good. other losses are not meaningful. i once rode almost a hundred miles on my creo...

in concept, yes. for the bikes i’ve owned the overall system efficiency is closer to 80% than your 58%, so more like 1.85 hrs to toast the battery completely, which at 8mph is 15 miles straight up an 8% grade… that’s 6,300 feet of climbing, or up Mt Diablo (near san francisco) TWICE. that’s a...

one very easy way to observe how fairly simple this is is to ride your bike up a known steady grade at fairly low speed with power pedals or cranks. below 10mph and above 5% grade you can basically disregard aerodynamic drag, and the differences between tires of the same general type are not too...

some interesting data ! 90% would be pretty incredible - and quite at odds with what’s shown in the report @Calcoaster posted, which indicates much lower efficiency than a typical mid-drive!

no, it wasn’t, and as most who have been around here for a while know, i’ve done plenty of “those things” on an analog bike. no matter, there’s an ignore list for a reason.

i've had several different power meters on several different bikes - front hub, rear hub, mid-drive, acoustic - and we're not talking about training. we're talking about riding up hills on an ebike. going uphill at slow speeds is not racing, training, nor does it require coaching. of course...

it may take a few years longer than it would in a "rational" world, but petroleum isn't magic. there's a century of human ingenuity, blood, sweat, and tears embedded in it and renewables are much earlier on the curve. but for all the same reasons that "horseless carriages" replaced horses, so...