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    Wheelie/Stability Control via E-Brake Circuit?

    I've often written that it's trivial to inadvertently power-wheelie a short-wheelbase, upright ebike. The resulting loss of steering input and progressive decrease in counter torque (making it easier to loop) is dangerous. Most controllers already provision for throttle cut via a normally-open...
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    Kelly KLS-H w/ Hall Sensors?

    The Kelly User's Manual names the KLS as "Kelly KSL Sensorless Motor Controller", and under 3.2 Connections: J2 Pin Definition, says "Hall phase (temporary unavailable)". Can anyone confirm whether the Kelly KLS can be run with Hall Sensors?
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    Nucular Controllers Delayed. Alternative 200A peak FOC w/ Regen & Cruise?

    I designed my next build around the high power density Nucular controller, but per their 2021 Nucular News(letter), the 6F and 12F will undergo a future case redesign and are delayed -- more or less indefinitely. Here is my wishlist: -FOC -200A peak phase current -Variable Regen Braking -Native...
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    9/16"-20tpi Crankarm Footpegs?

    My next build has a 24T drive chainring and 50T driven sprocket for a gain ratio of 1.0, and thus will not be pedaled with force. I'd like to save weight and use light motorbike-style footpegs rather than full pedals. Most similar threads relate to footpegs directly onto/into the bottom...
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    Build pack onto and around frame tube, rather than inside?

    In the interests of stealth, we've seen small packs inserted into frame tubes, and commercial ebike frames are built with a recess or box section to house packs. On conversions, where possible (hardtails), packs are braced within the frame triangle. Otherwise, packs are cantilevered from a...
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    Why isn't "node charging" through the balance leads more common?

    -The main pack leads could be hardwired straight to the controller, with no additional parallel connector hanging off. -Only the balance plug would need to be plugged in to charge, not pack leads + balance. -Every cell or parallel string would be independently top balanced on every charge for...
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    Danl New Energy / Guangzhou Yunyang Electronics Technology bulk chargers?

    Does anyone have experience or opinions on Danl New Energy / Guangzhou Yunyang Electronics Technology bulk chargers? They have a line of small & light "waterproof" "IP65" chargers at low cost. Datasheets are not posted, but available upon request. Example attached.
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    Safe RC-LiPo undercharge when bulk charging without BMS?

    My next 77.7V-nominal (88.2V-hot) RC-LiPo pack will normally be balance charged through the balance leads, but carry an onboard low-current bulk charger for occasional range-extension/emergency use. Assume cycle life at 4.2V/cell is acceptable. Assume cells are matched, and balanced before a...
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    Long Travel Fork on Short-Travel Frame?

    My short-travel frame with 107mm of rear travel is spec'd for 69deg headtube angle with 505mm axle-to-crown fork-- about 120mm travel. However, I selected a fork based on characteristics: unobtrusive single-crown, modern stiff Boost spacing, robust tapered steerer and 38mm stanchions, 200mm...
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    Direct/Fixed Mid-Drive Gearing Calculator for Tangent, LR, & CYC

    I wrote the attached Excel calculator for the popular high-power mid-drives from Tangent, LR, and CYC: While a gearing calculator is normally not needed for mid-drives since they can use the full cassette (indeed, that is one of their great advantages), I believe the highest-power mid-drives...
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    40mph commuter: slack hardtail on 29" tire or steep full-suspension on 26"?

    For a 40mph commuter over rough cracked roads, would you choose a slack hardtail on a 29" tire, or a steep full-suspension on a 26" tire? Slack hardtail: Chainstay: 430-440mm BB drop: 55-65mm Headtube angle: 66-67deg Seattube angle: 72-74deg Tire: 29x2.35 Schwalbe G-ONE Speed tubeless Steep...
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    Can "high speed" accelerate faster than "high torque"?

    This seems counter-intuitive, but would appear so. In this (exaggerated) example, with a target speed of 28mph, although the slow "high torque" winding creates more peak torque, it would seem unusable on a road bike without spinning the wheel or flipping the bike, and torque and power also fall...
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    Planning first e-bike: Rigid DD Fatbike Commuter; please help w/ frame

    Hello, I have stumbled across this forum many times over the years and appreciate the wealth of information; I'm now beginning to plan an e-bike myself. I used to commute on a fixed-gear crit bike, and love that it is reliable and light -- and therefore fast (though physically demanding)...
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