New build, BHT mid-drive "direct", custom frame

Discussions related to motors other than hub motors.
This includes R/C motors, botttom bracket, roller and geared drives.

bht   100 µW

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Re: New build, BHT mid-drive "direct", custom frame

Post by bht » Apr 02 2019 6:42am

trazor wrote:
Mar 03 2019 1:39am
Overclocker wrote:
Mar 01 2019 9:48pm


i should not have procrastinated w/ the sensor install. i would've seen that the yellow phase wire was rubbing against the rotor. eventually the insulation and copper wire wore off and started acting like brushes, hence the scorch marks

quality on this BHT motor is really crap :lol:
Bummer :(
The BHT motors are being sold again (after a long time of unavailability). https://www.ebay.com/itm/BLDC-MID-MOTOR ... 2649924278

For the price I think the Denzel 4500 has more copper, but will require other mount design.
The next time open the motor and take a view and install the temp sensor asap. On my LR BB and D4500 nothing was out of place, but you can feel how these aren't quality checked to high standards.

if you use by rated power my motor give to you zero problem ;) my new motor builded in unitemotor factory and cant say is bad quality

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Overclocker   10 kW

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Re: New build, BHT mid-drive "direct", custom frame

Post by Overclocker » Apr 02 2019 7:03am

bht wrote:
Apr 02 2019 6:42am
if you use by rated power my motor give to you zero problem ;) my new motor builded in unitemotor factory and cant say is bad quality

nothing to do w/ rated power. the yellow phase wire wasn't properly tied in so it ended up touching the rotor. a quality control issue

anyway i just got back from an event...

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SlowCo   100 kW

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Re: New build, BHT mid-drive "direct", custom frame

Post by SlowCo » Apr 02 2019 10:49am

:thumb:
Congratulations on getting first price on your first(?) event. Well done!

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macribs   1.21 GW

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Re: New build, BHT mid-drive "direct", custom frame

Post by macribs » Apr 02 2019 5:00pm

Congrats on the complete build, the first place and the paint job. Really fun to see the bike completed.

Great job and cool bike.

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trazor   100 W

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Re: New build, BHT mid-drive "direct", custom frame

Post by trazor » Apr 02 2019 5:38pm

Awesome!

Even if you race alone, please use some protection (if you are low on cash buy the first items).
I've purchased the cheapest stuff on amazon and I really like the products.
Gloves: https://www.amazon.com/gp/product/B07B4 ... UTF8&psc=1
Boots: https://www.amazon.com/gp/product/B00SX ... UTF8&psc=1
Knee/shin guard: https://www.amazon.com/gp/product/B008Y ... UTF8&psc=1
Body armor: https://www.amazon.com/gp/product/B002T ... UTF8&psc=1

Using those changed my riding style from "hehe this is going to hurt" to "who cares, i'm god." I think this is usual, because the jacket comes with a sleeve that says something like 'WARNING even if you use this jacket you can die from an accident" :lol:
Last edited by trazor on Apr 03 2019 2:07pm, edited 1 time in total.

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madin88   1 GW

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Re: New build, BHT mid-drive "direct", custom frame

Post by madin88 » Apr 03 2019 5:16am

Overclocker wrote:
Apr 02 2019 7:03am
anyway i just got back from an event...
Congrates! :thumb:

Did you won a race? or a building contest?

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Overclocker   10 kW

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Re: New build, BHT mid-drive "direct", custom frame

Post by Overclocker » Apr 04 2019 2:45am

trazor and madin888,

it was a race but nothing serious, was just for fun. slow twisty track so i didn't even put on all my gear, coz i'm not an all-the-gear all-the-time person :lol:

but thanks for the links trazor! when out trail riding i put on elbow, knee/shin, gloves, and hiking boots.

PS here's the all-electric lineup:

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skeetab5780   10 MW

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Re: New build, BHT mid-drive "direct", custom frame

Post by skeetab5780 » Apr 04 2019 8:05am

That's awesome! Looks like that red scooter was likely your toughest competition :)

great job on the build and 1st place well deserved

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Overclocker   10 kW

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Re: New build, BHT mid-drive "direct", custom frame

Post by Overclocker » Apr 11 2019 6:34am

thanks skeetab!

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just got a budget quad piston for the front only. the rear tire is already easy to lockup

working great so far. i also got these 203mm rotors. thicker and heavier than shimano RT-66 that i replaced. 250g each. seems to be more powerful too, probably due to having more contact area i.e. less drilled out

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Re: New build, BHT mid-drive "direct", custom frame

Post by Overclocker » Apr 27 2019 11:07pm

i just got 4 boxes of #41 chain (10ft/bx). interestingly #41 uses the exact same size sprockets as #420. much lighter weight. slightly smaller pins. we'll see how fast it wears out...

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i'm also posting these side-by-side pics of these various size chains because i couldn't find any proper pics on the web. top to bottom:

- #25H
- 1/2" x 3/32" (for 6 7 8-speed bicycle)
- 1/2" x 1/8" (also known as #410, for single-speed bicycle)
- #41
- #420

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Overclocker   10 kW

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Re: New build, BHT mid-drive "direct", custom frame

Post by Overclocker » Apr 29 2019 2:12am

#41 running great so far...

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the 220mm shock w/ 550lb spring was too soft so i purchased a 240mm w/ 650lb spring. will test it soon

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trazor   100 W

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Re: New build, BHT mid-drive "direct", custom frame

Post by trazor » Apr 29 2019 3:33am

Overclocker wrote:
Apr 11 2019 6:34am
just got a budget quad piston for the front only. the rear tire is already easy to lockup

working great so far. i also got these 203mm rotors. thicker and heavier than shimano RT-66 that i replaced. 250g each. seems to be more powerful too, probably due to having more contact area i.e. less drilled out
I've found the same conclusion. I use 180mm on rear wheel since is enough to lock up, 203 in front.
Up to now my prefered brakes are the Shimano Zee. https://www.chainreactioncycles.com/shi ... -prod82434 , quad piston designed for downhill, amazing modulation.
Those 203 rotors you have look thick. Are the usual 1.8mm width? Magura makes 2.0 rotors by default. Talking Magura, I purchased one MT5E, these come with brake cut switch and are flip flop (you can use left or right). https://www.amazon.com/Magura-MT5E-Carb ... B01EQS1Z6O . Last years I've been using other Magura device to make the brake switch ( https://www.amazon.com/gp/product/B015DJWWM6 ) but I can't find any dealer that carry these anymore. That makes me ask... do you have a brake switch on the brike?

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minde28383   10 kW

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Re: New build, BHT mid-drive "direct", custom frame

Post by minde28383 » Apr 29 2019 3:46am

Tektro makes 2.3mm
These are coupled with brake supports designed for up to 45km/h as they advertise it.

Usually brake rotors are ~1.8mm

Ps. Chinese brakes comes with thin regular brake rotors and are advertised as brakes up to 45km/h.

Never tried but I think before mentioned magura brakes are good brakes. In the same price range as alternative comes tektro hd71x, hd72x.
ebike build in progress
CN 5.5kw scooter (on sale)
E Mindless Maverick Talisman longboard, 2.2KW motor, 150Amps controller (on sale)

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Overclocker   10 kW

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Re: New build, BHT mid-drive "direct", custom frame

Post by Overclocker » May 04 2019 12:28am

trazor wrote:
Apr 29 2019 3:33am

I've found the same conclusion. I use 180mm on rear wheel since is enough to lock up, 203 in front.
Up to now my prefered brakes are the Shimano Zee. https://www.chainreactioncycles.com/shi ... -prod82434 , quad piston designed for downhill, amazing modulation.
Those 203 rotors you have look thick. Are the usual 1.8mm width? Magura makes 2.0 rotors by default. Talking Magura, I purchased one MT5E, these come with brake cut switch and are flip flop (you can use left or right). https://www.amazon.com/Magura-MT5E-Carb ... B01EQS1Z6O . Last years I've been using other Magura device to make the brake switch ( https://www.amazon.com/gp/product/B015DJWWM6 ) but I can't find any dealer that carry these anymore. That makes me ask... do you have a brake switch on the brike?


https://www.aliexpress.com/item/new-arr ... 15682.html

1.9mm

no brake switch. yes i know, dangerous :lol:


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skeetab5780   10 MW

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Re: New build, BHT mid-drive "direct", custom frame

Post by skeetab5780 » Jun 07 2019 11:53am

Looking good! About to throw mine in the truck and do the same

Ianhill   10 MW

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Re: New build, BHT mid-drive "direct", custom frame

Post by Ianhill » Jun 11 2019 6:43pm

Really like this bike looks a nice well positioned ride, how do you find the rear wheel bearing hold up? I only ask I got a kuberg it's uses 219 chain and a simular looking hub with either a 12 or 15mm axle if I remember correct and after 100 miles or so the wheel needs a rebuild bearings shot with the torque loading how you getting on in this regard, Thanks again Ian.

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Overclocker   10 kW

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Re: New build, BHT mid-drive "direct", custom frame

Post by Overclocker » Jun 14 2019 11:21pm

Ianhill wrote:
Jun 11 2019 6:43pm
Really like this bike looks a nice well positioned ride, how do you find the rear wheel bearing hold up? I only ask I got a kuberg it's uses 219 chain and a simular looking hub with either a 12 or 15mm axle if I remember correct and after 100 miles or so the wheel needs a rebuild bearings shot with the torque loading how you getting on in this regard, Thanks again Ian.

i'm using a rear hub for a 150cc motorcycle that weighs over twice. uses sealed cartridge bearings but no signs that they need replacement despite repeated river crossings...

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Re: New build, BHT mid-drive "direct", custom frame

Post by Ianhill » Jun 15 2019 3:27pm

Couldn't be a pain and ask you the dropout width of your rear ?
Sounds like I need a better hub ideally it's tapped out.

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Overclocker   10 kW

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Re: New build, BHT mid-drive "direct", custom frame

Post by Overclocker » Jun 17 2019 10:36am

Ianhill wrote:
Jun 15 2019 3:27pm
Couldn't be a pain and ask you the dropout width of your rear ?
Sounds like I need a better hub ideally it's tapped out.

160mm

btw check out the sur-ron rear hub

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Re: New build, BHT mid-drive "direct", custom frame

Post by Ianhill » Jun 17 2019 1:58pm

Top man for replying, my hub is 145mm so that's not gonna work, I've got the most heavy duty hub available for the size but 12kw geared low just smashes the rear end to bits, new swing arm time I think.

Grantmac   10 kW

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Re: New build, BHT mid-drive "direct", custom frame

Post by Grantmac » Jun 17 2019 2:48pm

Have you looked at the OSET hub?

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Re: New build, BHT mid-drive "direct", custom frame

Post by Ianhill » Jun 17 2019 3:49pm

Grantmac wrote:
Jun 17 2019 2:48pm
Have you looked at the OSET hub?
Yes I'm gonna ring them in the morning and see what axle they use, I've got a 15mm axle after checking.

It's for a kuberg freerider pro i gor second hand the original wheel was a 14,3.00 trials rim with a wierd sprocket that matches a disc brake hub but with 7 bolt pattern, I only noticed after I bought a oset sprocket carrier and then noticed 7 not 6 so I need to build a new wheel from scratch or a swing arm and upgrade.

I got a 36 spoke dh32 rim 20 inch and sapin spokes spare so I could take a punt at the hub get a sprocket for my carrier and see if it solves the issues, I will say though the torque seems alot for what's a push bike setup really to cope with and that's factory.

I can't find much info on the surron hubs but I bet that route would be more expensive than just making a new swinger and getting a decent mx rim on there.

Thanks guys for the input.

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Overclocker   10 kW

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Re: New build, BHT mid-drive "direct", custom frame

Post by Overclocker » Oct 13 2019 3:14am

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just ordered a yuyangking YKZ7280JA. 80A square-wave controller. let's hope i don't fry the motor :lol: to help avoid that i'll be installing a smaller 11T motor sprocket (currently 13t, 53t rear)
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