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    Off the line torque - DD motors

    This ^^^, and also, sometimes just due to the resonant frequencies of your frame (each bike is somewhat unique as it’s due to the stiffness of the frame/frame components/the lengths and geometries/how tight it’s bolted together etc.). If it’s not stiff enough which could be the case of your...
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    Kona Stinky Fitz 2010

    Yup. Some of them came with these and it was a popular mod for the ones that didn’t. Any single pivot rear suspension design where the rear wheel moves in an arc and not a more vertical path like some other types can experience “brake jack” which is when the rear suspension stiffens when the...
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    Your Creation's Before & After Pics

    2004 Rocky Mountain Switch freeride/DH full suspension. Put a 1500W KT CSC kit on it from Aliexpress and made torque arms with 1/4” steel. Replaced the main pivot bearings in the rear suspension, they are needle roller bearings (very strong). Bike also needed a new bottom bracket which I...
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    29" Full Coverage Fenders for MTB

    Does SKS make the Velo Mountain 65 (65mm wide) in a 29” version? Great fenders and they look fantastic. I have the 26” ones and they clear a 2.4” wide Schwalbe Super Moto-X (supposed to be 62mm wide). They were surprisingly affordable, paid around 30$ Canadian for them.
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    KT Controller Recommendation

    Have you tried the open source firmware from the 200 page thread here? More stuff to have fun with the KT controllers. It implements field-oriented motor control and is dead quiet and smooth. You can set any current limit you want. You need a 7$ STLink dongle from Aliexpress and follow the...
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    What spokes are needed mtx 39 ebike wheel

    Do you have a 1500W kit that came with an MTX39? Both of my 1500W (another flavour of leafmotor) kits that came with the MTX39 rims have a version of the rim made by SunRingle for these Chinese ebike kit makers with 5mm diameter holes for the nipples (and without eyelets). The 12G spokes that...
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    Bolton Ebikes Dual Battery Parallel Connector causing random sudden over volting?

    I’ve been running two 13s3p batteries in parallel for two years and hundreds of charge cycles by now. You only have to plug the charger into one. I leave them connected with no issues and both charge. My batteries have a separate charge connector on each along with the XT90 connectors. I leave...
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Got my STLink in the mail last week. Can confirm the $6 Aliexpress knockoff version works fine. Managed to fix my spare controller (actually my first KT 18 FET controller that came with the first kit I bought, a SVPR version that came with IRFB4110 FETs (4.2mA RDS on, very nice) from...
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    Confusion about which controller to buy for Voilamart 1000w hub motor

    Have you seen the KT open source firmware project in the motor sub forum? The thread is ~180 pages long with a wealth of information. These controllers sell for less than 100$ (75 CAD shipped for the big 18-MOSFET one that does 45A, and 48/52V or 60-72V versions available). Guessing about 60USD...
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    Is there a "best" cheapo ebike build kit?

    Bare minimum a 13s3p if using higher quality cells. I ran my 1500W (actually ~2000W because 45A x 48V is 2160W) at 50% max current (lowest setting) with a generic 13s3p Aliexpress 7.8Ah/2600mAh cell pack at first before I bought a second identical pack to run at full current in parallel. Had...
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    Suspension Forks, Talk to me

    The fittings look very similar to the older Hope stuff. If you like the brakes it shouldn’t be too hard to find a nice used fork with IS mounts like any older Marzocchi. They are dependable, easily rebuilt and plush. Should cost less than $100 for a good one, almost free if you’re lucky...
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    Suspension Forks, Talk to me

    Those are called IS mounts. The newer style is called post mount. IS-post mount adapters are very common so you can use newer calipers with an older fork, but IS calipers were rare as most were post mount and they used IS-post adapters to space out the caliper for the rotor size. Also, post...
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    Ruined $150 Shimano Deore hydraulic brakes

    I have a BR-MT520/501 combo on the front of one of my bikes (the same 4-piston Shimano that you have). In my experience, it is a great brake. Basically the same performance as the Deore/SLX/XT 4-piston (even has ceramic pistons and servo-wave lever) but painted black and marketed as an OE ebike...
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    Well somethings not right..

    A short between any of the phases will cause a regen-like pulsating feeling and slow the bike down. You can try this yourself by disconnecting the phase wires from the controller and touching two of them together and pushing the bike. Since it happened with both motors, I would get out the DMM...
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    Suspension Forks, Talk to me

    I use the e-bike mainly to go to the grocery store and/or Post Office. Never can figure out where people manage carry a bit of cargo on those things and I have never needed more 750 watts even headed into the wind. FYI: I usually drag a Burley Travoy Trailer with the hitch on the rear rack...
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    Well somethings not right..

    Could it be a hall sensor/sensor wires issue? If you are running a sensorless setup of course disregard, but if the controller was out of phase with the motor couldn’t that cause some weird harmonic noise? Motor spins freely with normal amount of drag? Did one of the axle seals pop out of...
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    Is there a "best" cheapo ebike build kit?

    Best worthwhile entry level brand new kit? CSC on Aliexpress builds nice kits at great prices with KT controllers and displays (best entry level controllers and displays with a wealth of troubleshooting info because they are widely used and easy to set up, also have an open source firmware...
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    Suspension Forks, Talk to me

    You can run a smaller wheel in a fork designed for larger sizes, as in, a 24” wheel in a 26” fork or 26”/27.5” in a 29er fork. As others have said, a single crown fork with 100-120mm travel will work nicely. Better to have something decent quality than heavy junk. That said, if you scour your...
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    Best Leafmotor winding for 72v 150 amp controller?

    To be fair the “1500W” (35mm wide stator) Leafmotor can be run at 2000W all day and 3000W for shorter periods (during acceleration) without modification. To me this is all the power needed for something that will still handle like a bicycle. With some ATF or statorade people have run them at the...
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    Let's discuss brakes

    To rule out contamination: spray a mixture of dish soap and water on the brakes, rinse. Again, then ride for 10 seconds around the driveway squeezing soapy brakes lightly and then rinse. Ride around stopping hard for a minute or two to re-distribute pad material on the rotor. If everything else...
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    2004 Rocky Mountain Switch 2kW

    The cat is a big lovey cat that literally drools with affection when you pick him up and get him purring. What a way to live and they are definitely above it all. Free to come and go as they please (I don’t believe in having “indoor cats” personally, think it’s cruel), someone to scratch their...
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    2004 Rocky Mountain Switch 2kW

    Picked up this 2004 Rocky Mountain Switch for $350 complete without a chain. Needed new main pivot bearings, new bottom bracket, and a very thorough cleaning. Going for a “naked e-MTB” look. Fork got an oil change to Valvoline Maxlife full-synth ATF (~9wt.). Very dirty. Made a seal-mate tool...
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    KT Controller Recommendation

    Pasion ebike on Aliexpress is great. They go the extra mile and put XT90 battery connectors and XT150 phase wire connectors on by default. Bought a 1500W 26” kit off them with the KT 18 MOSFET 45A Sine Wave controller and the LCD3. Great combo, sine wave controller is quiet and smooth. Got a...
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    Will this bike work for a 16KW build?

    Why not use a leafmotor/leafmotor clone “1500W” (35mm stator) that is capable to 3000W without modification and 5000W bursts? They come in 135mm axle length so much easier to find a bike that will fit. Tons of speed and hill climbing power for any bicycle. At the 16kw power level, you are...
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    Rear derailleur cable attachment lever arm hits hub motor gears 3-6 on six speed freewheel.

    FYI I got it to clear with two mm-or-so thick stainless washers. Still looks like more than 2/3rds of the threads are being used and the b-tension tab is just long enough to work fine. Lots of clearance for full travel of the cable clamp. With one washer it was barely touching at one point...
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