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    2022 M2S Ultra HT (hardtail fat-bike) review

    Since someone has asked in DM, I decided I should add here as well: after 400 pretty brutal high-altitude miles and two blown hubs, If I had it to do again, I wouldn't. I think the bike is probably par for the course of mediocre electric bikes made by slapping together the cheapest Chinesium...
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    Hub motor repair: hall sensor edition

    Interestingly enough, they shipped an unthreaded motor, then had me remove the stator package from both and swap them. The motor's working again, so now I've got both a working bike and hall sensors to debug.
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    High-strength freewheels or freehubs

    To be fair, I'm not maximizing for acceleration, I'm just trying to make sure that my bike is both rideable without assist (if I'm in the very plausible scenario where the motor or battery fails miles from civilization) and will survive the maximum reasonable input from both motor and human...
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    Eurobike 22..Frankfurt.

    Your mistake was buying a Twix and not a Corny or a frankfurter.
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    How i can remove the ferrite ring from the shaft

    While I agree with not heating the magnet directly, do be aware that heating the shaft will cause it to expand and increase its friction interface with the magnet. Your best bet is to do this to break down the glue, then cool the shaft rapidly (ice cubes) so it will shrink before the magnet...
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    My diy ,full suspension, mullet,, hub drive fatbike build

    Quite a way to drive views there, bruh.
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    Hub motor repair: hall sensor edition

    Minor update: had to reassemble to take photos and video of the behavior for their warranty department. They're shipping me a new motor and I suspect they won't be asking for the old back, so I should have the opportunity to repair that one at my own pace. If the replacement ships from CN...
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    Radvertising

    You obviously don't subscribe to the SUV model of toughness: suspension and knobbies makes you Offroad. Period. :twisted:
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    Considering build - 20" folding bike

    I own one and ride it and am not a small individual. While folding wasn't a qualifying factor, it's hard to find a 20" fat bike that isn't one, and it's nice for putting it in the trunk of the car rather than on a hitch mount. The bike still weighs 60lb. It's not the nicest bike nor as twitchy...
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    Hub motor repair: hall sensor edition

    That I can hand-rotate it in reverse with nominal resistance. I can't yet check under power. I'd certainly prefer to avoid cracking the case. The exterior connector is a waterproof 9-pin barrel strongly similar to this one. Inside the controller enclosure, that waterproof connector terminates...
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    Hub motor repair: hall sensor edition

    Although it's a geared motor (CZJB-104C2), it rotates fine in reverse. All connectors to the controller are snug and have no visible insulation failures or scorch marks, so no immediately apparent shorts at this stage. Sounds like I'll get to break into the housing eventually and start...
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    Hub motor repair: hall sensor edition

    In generic terms, we'd just exited a fairly rough descent of 1.25mi, no assist so the motor should have been relatively cool. Began climbing an approximately 10-15% grade on PAS 1 or 2, occasional throttle squirts to help boost past roots or rocks that were curb size or smaller (not braced...
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    Hub motor repair: hall sensor edition

    Yup, they're attractive to a different market than the average Spherester. If it's repairable within reason we'll do so and keep it in town for its original purpose: year-round grocery-getting in a city that doesn't plow surface streets. In the greater scheme, this just bumps the budget...
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    Hub motor repair: hall sensor edition

    Momentarily ignoring the wisdom of buying a cheap bike from the lowest bidder, we took such a vehicle slightly outside of its operational envelope this weekend (a 20" fat bike on +1 "blue" single-track) and, according to the error the controller is throwing, killed one or more Hall sensors...
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    Purchase new or DIY

    This is a great one to illustrate the power requirements. An "average" user of 5'10" @ 165lb on a 120lb bike (roughly how much a Sur Ron weighs, IIRC) on medium-width slicks requires 900W to sustain 31mph. To travel 75 miles at that speed would require about 2.5 hours, so 900*2.5 == 2250...
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    BESST tool dependency and availability

    As I understand it, the BESST software is dependent specifically on the BESST tool, and will not work with any of the DIY USB interfaces. I'd be very happy if that's not the case, but it doesn't seem to be stated unequivocally anywhere. Even so, the sum cost of the parts to build a DIY...
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    Purchase new or DIY

    Be aware that limiting yourself to a CAN bus motor (as I did in also selecting the M620) severely limits your machine's malleability and exposes you to very poor motor programming. I consider myself fortunate that my M2S bike allows me to change the top speed on-bike, and deeply unfortunate...
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    Bafang M500/M600 thread

    @casainho has them documented (or at least enumerated) here in his M500/M600 software project. The question is not whether you can change them, but whether you have a motor firmware that allows them to be changed. Those parameters showed up in BESST recently, and it stands to reason that they...
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    Freewheel systems: redundant in mid-drive machines?

    Certainly, that's what we see in any other traditional BB bike with a derailleur and the freewheel fails or the chain gets caught in the spokes - goodbye derailleur, and maybe chain depending on how fast you're going. One's nose and chin, for that matter, after the superman impression. If (and...
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    Freewheel systems: redundant in mid-drive machines?

    As I work through my hub issues, I've been thinking dangerously. Is the ratchet system in our rear hubs redundant to the ratchet or similar engagement system that many mid-drive bicycles appear to implement? Without trying to clumsily recreate from first principles the rationale behind a rear...
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    High-strength freewheels or freehubs

    Onyx is pretty coy about what kind of torque they'll tolerate, so that underscores this observation. There are ancient posts here implying that they handle more than e-bikes produce, but when I just asked they state that 500N-m is definitely off the table. The only further commentary they...
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    High-strength freewheels or freehubs

    Am I doing my math wrong here? Say you have a 100kg human standing unsupported on the end of a 170mm crank arm at the 3:00 position, otherwise unsupported. That is roughly 166N-m of torque? 100kg * 9.8m/s/s * 0.17 == 166.77, which mirrors what you get if you do the same calculation for ft-lb...
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    High-strength freewheels or freehubs

    Plausible. Could also be that they decided on a price point first and are using the ceramic bearings to help a potential customer justify the price in their head. More features, regardless of their actual utility, make us biologically happy. See the Swiss Army knife if you've any doubt
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    High-strength freewheels or freehubs

    Even at the stroke-inducing price of $500 and up to 6 weeks' lead time, that's awfully compelling. Silent, four sealed ceramic bearings, a 7075 housing and dual sprag clutches working against stainless steel friction surfaces. Moreover, they will sell you every single part individually? I...
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    Ebike trailer 200ah

    What car batteries are you planning to use that are 50AH apiece? That sounds more like lawnmower or UPS size cells to me, the car/truck batteries I'm familiar with are more in the 75AH range. I'm curious what actual effect the additional 250lb and boost-circuit inefficiency will have. Going to...
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