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    25cent wind noise mitigation

    I don't know about you, but if I'm (routinely) exceeding 30 mph on an ebike I find wind noise extremely unpleasant. Indeed hearing damage can occur above that speed. I always wear earplugs for shop work, but they're ineffective at killing wind noise, which is transmitted right through them by...
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    T-Motor U15 80kv VGC

    Rare high quality motor in very good condition. Better suited to aircraft/drone use than ebikes. 80rpm/volt. Prefer to sell in US but will ship wherever for actual shipping cost. I've been on this forum for a few years and have posted several builds, buy with confidence. Includes original box...
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    Tronic 250r stuck at WOT

    In the never ending saga to get my Blackcomb bike build with the Tmotor U-15 running properly, I put a Tronic 250r on it. Ran great for about 75 miles (FOC), no top end cutouts as with the Flipsky 75200, just a faint low-mid range shudder that I was trying to tune out. Yesterday, ADC1 throttle...
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    Electro&Co EC4P

    Any users out there who've put some hard miles on this motor? Considering buying one soon... at 300 bucks shipped it looks to be a pretty fair deal. They've done a nice YouTube video ad/teardown. Given the 100% reliability and good performance/value of the (3) 3000W MY1020's I have, this would...
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    Hyper Explorer 29er

    Picked this up the other day for 170 bucks. Another budget brand ride with actually a very good donor frame. Nice TIGed aluminum front triangle with a stylish formed top tube and cool red anodizing. Steel 4-bar linkage rear suspension of my favorite design, and great to weld a motor mount to...
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    Mongoose Pug on/off road

    I'm back at the FL headquarters for another winter, so that means more ebike projects and Endless-sphere! May as well document this one- my third Mongoose brand build, so a stable of Mongooses, Mongii, Mongeese, take your pick... Cost me 120 bucks off Craigslist. A kids 8 speed fat bike with...
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    38120's won't take a charge

    I have half a dozen used loose red Headway cells that all sat dormant for a bit over 2 years at between 50-90 degrees F. All register 3.3V. They were never over or under charged and were functioning normally. Now, none will take an individual charge on an Imax b6. They stay cool to the touch...
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    Wanna see a fried HI200?

    Bad day in Barncat Land. Was shooting a video of some brief high speed runs with the flagship Mongoose Blackcomb. On the third pass the controller inexplicably burst into flames (plus the camera work sucked but I digress)... and this was 15s charged to just 61V. So I'm left with a pile of...
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    The Barncat Battery- No weld/no solder

    I designed and built these packs a year ago. After a couple thousand miles of testing and considerable internal debate, as a service to the DIY community and as a social experiment, I'm releasing the design publicly. You use my design and any information contained in this discussion thread...
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    vesc red lighting on decel

    having a specific issue with my knock-off HI200 driving my Tmotor U15 (36N42p) on the Mongoose Blackcomb build. 15s5p Molicel p42a battery pack. after watching the Ben Vedder vid on setting up parameters for that motor (thanks to kubark42), it's basically all good, and motor winds right up as...
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    High-engage BMX freewheel adapted to 80T sprocket

    for those of us who are building chain drive bikes, the performance of cheapo flanged freewheels that adapt rear sprockets is very disappointing. just two weak pawls, lousy tolerances, and a lot of lash to take up when you hit the throttle. i've devised a way to adapt a good quality bmx...
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    Flipsky 6.6 vesc 150A

    excellent condition, used only 15 minutes. 12s, 150A max rated. FOC, programmable, see Flipsky.net website for details. currently new they're $180 US, will part with this for $125 plus Priority Mail flat rate shipping. overseas will be more, i'm in Florida. includes the pricey on/off switch...
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    OCC Stingray hotrod

    Time to resume ebike builds for the FL "winter" :bigthumb: Picked this up last season for 40 bucks. If there's a bicycle out there begging to be amped up this is it. The Teutels being chopper builders and all... Will be bolting on another MY1020 inrunner rated for 72V and will be sharing the...
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    Battery suppliers

    Thus far i've had good results with batteryhookup and batteryclearinghouse. Anyone bought from bulkbattery in Smyrna GA? I want to buy some brand new cells, i suppose they're legit.
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    Flipsky 80100... Reviews, advice?

    A fair amount of searching didn't turn up much info or actual reviews. One thread here about rewinding... Considering buying one for latest ebike project as they seem to be the only outrunner commonly available at present? Still a layman in this arena, and started out with the basic MY/Kunray...
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    Mongoose Blackcomb

    Picked this up yesterday for 75 bucks. Will be intended as a street ride to smooth out the inevitable bumps and potholes... the bmx build I just did is fantastic and precise on smooth pavement but a bit harsh on less optimal surfaces. Cool aluminum main frame that will lend itself to attaching...
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    Manual balance discharge device?

    Sorry for asking as this has no doubt already been addressed (can't find) but what would be the best cheap and easy resistive device to put between alligator clips to manually bleed charge off, say, a 5p 18650 cell group? I'd think 5A would certainly be a safe current draw and my Imax B6ac is...
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    Negative to negative parallel short Q

    Embarrassed to ask, but what happens if the cans of two 18650 etc cells in different parallel strings of a series pack short? Can't seem to find that answer through search and can't really visualize it...
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    Are generic Chinese controllers and throttles non-adjustable?

    I assume the answer is yes. I have a 5 wire Hall sensor throttle with V indicator and a 60v 55A controller. Both are ostensibly made well. The annoying thing is the instant voltage is applied from a standing start too much motor torque is generated, even with the most delicate possible...
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    I assume this generic controller has LVC?

    I've done a lot of reading on site but since this is my first ebike project- I interpret the label on the box to mean there is LVC that can be user dialed in from 1.1v - 3.7v below 60v nominal pack voltage? I was attempting to just bench test the throttle wiring with a 36v pack. I don't have...
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    What's the current gamut of solderless/weldless 18650 battery pack construction?

    Just asking those who've been around this field for a while... All I'm really aware of is the Vruzend system. I've just built what I believe to be a novel enclosed prototype that's efficient, quick and easy to assemble/disassemble, with all copper buss bars and low part count.
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    3000w Mongoose girder

    I've built 20 ICE cafe racers over the past 15 years but figured I'd finally dabble in putting together an electric urban toy. Here in the flat FL Gulf Coast, top speed target is around 50mph... either 18 or 20s. Will see how well these BOMA MY1020 motors work. Pretty beefy but they could have...
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    12 cell 18650 4s3p laptop(?) packs in series

    Surely some builders here are familiar with those used black plastic flat li-ion packs that are 4s3p. How many packs would it be realistic to chain in series without frying something with possible bursts of up to 40A draw? I suspect the stock + - leads and/or the built in bms wouldn't tolerate...
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