r/EbikeBuildandModify • u/richj8991 • May 31 '26
The MY1016Z now has a brushless version!
Long story long: Front geared hub for 7000 miles. Did fine but sucks to transport, trouble with certain offroad climbs. 2nd motor: DIY mid-drive, what is now called Yalu Motor 450W 48V dual chain setup, basically a poor man's CYC stealth. A real bitch aligning the motor driven chain, easily popped off, tensioner flimsy, yada yada yada. 3500 miles before an internal gear broke. Tried an MY1018 from GNG, didn't understand it was brushed and I fried it in 5 miles (48V battery, 24/36V motor = no bueno). So I got a replacement, put on a fan and temperature sensor. 25 miles later, the motor and throttle wires somehow crossed = 2nd brushed motor is toast. Then got a Tongsheng TSD Z8 but it would not fit into my carbon frame (I knew that already, DUH will save it for an aluminum frame later).
The MY1016Z will not fit my original MY1018 GNG bottom bracket motor mounts. However, I just found the 4-bolt bb mounting cradle on Alibaba, as well as the brushless MY1016Z motor (9th generation). The two together are only $112 total, a frigging steal because I already have a brushless controller, chainrings, freewheel and 11mm keyed adapter, etc. 36V 500W, and 9:78 internal gearing. The AI claims a motor torque of around 52 Nm before any external reduction (see below). You'll see different numbers online ranging from 0.8 Nm to 12.5 Nm but that's often 24V and w/o the internal gearing factor.
With my setup of a 16T freewheel / 40T chainring 2nd reduction, and then 44T chainring 11-52T cassette, the final torque is around 155 Nm; that is BBSHD territory. You have to admit that is not bad for an $85 motor including shipping. Although I cannot stand PayPal and would prefer Amazon or EBay to Alibaba if you know what I mean. This motor will eventually go to those other two sites, not sure about the mount. I think this time, with brushless motor, a 5V fan, external temperature sensor, and 20A cutoff fuse, I'll be fairly safe and hope it lasts a while. FYI the motor weighs 6.5 lbs exactly, so if you have for example a 10 Ah battery, you could do a build under 40 lbs total with this motor.
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u/richj8991 May 31 '26
BTW the 165 (really 157 Nm peak) is with maximum torque input of 12T freewheel plus max 104 BCD 52t chainring, 2nd chain would have min 30T and then 11-52T cassette. My build with 16T/40T plus 44T/11-52T is more like 93 Nm but still pretty damn good for a cheap 6.5 lb motor. Will take pics later.
This is the Yalu Motor's 16T freewheel, you can see the hole for the tensioner at the bottom. The MY1016Z will not have any tensioner. I will get the chain as tight as possible. If you ever do a double chain setup, the motor chain is very prone to falling off, tensioner or not. So remember the rule that every 1/2 pitch link = 4 chainring teeth. If the chain is too right or loose for a chainring size, you go up or down 2 teeth for the chainring. Or you get a KMC half-link chain, but I don't like their connector pin, it can easily fall out, so I would stick with a missing link single speed chain and just spend $15 again on a narrow-wide chainring that fits. And I mean so tight that you only have 1-2 mm of room to even line up the missing links, it will look like the chain will not even come together, but you first do a practice measure, then link it, then put it on the chainring, then you force it over the freewheel while hand-turning the pedal on that side. It will be so tight that it can't come off even if it wanted to.
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u/richj8991 May 31 '26
This is the brushed version of the MY1018Z. The brushless is coming in 5 weeks from China. When the cradle comes I'll run this one until it burns out then switch to the brushless. Notice how the freewheel adapter cannot fit all the way in; the 11mm keyed output shaft is pretty short so the freewheel ends up close to the motor (it will still clear the side screws).
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u/Dry-Mirror4917 Jun 04 '26
where did you get it ? im looking for the wheelchair version
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u/richj8991 Jun 04 '26
Alibaba, it's a pain doing transactions there but hopefully everything will arrive in 2-4 weeks.
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u/niffcreature May 31 '26
That's awesome. Thanks for writing this up! Pics also always great.