Recent content by mschwett

this is awesome !!!! have you tried wandrer.earth? it tracks what % of the roads you've ridden in various places. it's fun and the notifications that you covered a new xxx miles are always cool. sadly i don't get out much anymore but here was my last heat map from 2024, maybe 15,000 miles of...

would be interesting to conpare a few different cadences from both the display and the fit file to see if they’re really just always assuming 80%, or do they take into account their own published curve which is clearly much lower in places…

pretty interesting. basically what we see is that the support factor at xx/100 is significantly higher than what specialized claims it is. your observed values on the right, spec data from the reference paper on the left. that said ... inferring a few more data points than you studied (20...

not too surprising... but it's still way off lol interestingly the very low rider power values <100 watts actually match pretty well red is mahle blue is 4iiii precision

hmmmm. i think pretty much every mainstream bike from aventon, gazelle, specialized, trek, giant, vanmoof, etc is a geared motor. even rad switched to geared like 5 years ago, i think. in addition to more torque geared motors are smaller and more efficient at low speeds, because the motor isn't...

so i replaced the bottom bracket on my addict today. i'm guessing this is NOT going to change the power inaccuracy, but it'll be interesting to see! it took my a bit under an hour, but it's one of those things that would have been a PITA without the right tools. here's the tools all standard...

almost all ebike motors are geared tho, so the relationship between the motor speed and the wheel speed is whatever the motor manufacturer wants it to be. at a lower voltage you could just gear it down less and up the current for more torque at the lower speed. i am not really sure what the pros...

yeah, that's going to take seriously GRINDING up a hill at 100/100 in a very low gear. be careful, that's the kind of riding that causes people to hurt themselves or have a body <-> pavement interaction.

Why? Because engineering and physics. The SL bikes use 48V batteries, quite small ones (not sure what the C rating is). Most of the other non-SL bikes use 36v batteries, larger ones that are presumably more parallel to support higher current. The new Levo 4 is 60v to support the very high power...

the older specialized chart does confirm very high efficiency at high rpm. it also suggests that the efficiency should be higher at lower rpm, but maybe the new motor sacrificed that a bit, or maybe a longer steady state test would show lower electrical draw?

cool my guess is, however, that the system is not 84% efficient at 100rpm. more likely it’s just not outputting quite the full 315/320 watts of mechanical power when the electrical draw is only 377w. i think specialized would be crowing about it a lot more if so :) it’s very interesting that...

i’ve very much enjoyed inflating with the cliks. it’s so much factor and more satisfying! on both my road bikes. air loss is very minimal between rides but i also refreshed the sealant when i installed the cliks. both tubeless of course on my commuter, somehow the process of screwing in the...

an interesting note in a review of the new firmware for the full power levo, perhaps explaining why 0/100 on microtune is not really 0.

i think the varied efficiency of the motor (let's call it 70-80%) and the inability to measure this property directly make it difficult to base any predictions or observations on mechanical motor power...

ok, i have no idea how i achieved that u shaped result! what the heck! going back to the data, if you consider support factor as the inverse - rider power / motor power, it's actually linear. a very simple first degree equation can go from ease and rider power to motor power - motorPower =...