Lowrider eBike project

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wheelbender6   100 W

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Re: Lowrider eBike project

Post by wheelbender6 » Dec 12 2019 10:56pm

I love this thread. I recently finished my banana seat bike (Sears Spyder replica) build. I may have to add a hub motor.
"Money can't buy you happiness, but it can buy you a yacht big enough to pull up right alongside it." - David Lee Roth

Turbotd04   100 mW

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Re: Lowrider eBike project

Post by Turbotd04 » Dec 13 2019 12:11am

E-HP wrote:
Dec 06 2019 12:49am
Turbotd04 wrote:
Dec 06 2019 12:25am

I was surprised how hard it was to bend back so there is still quite a bit of strength there I recon and now I haven't got the brake pressure on it it should be ok but if not I can just get a new one. The bend is to far up to be able to cut it and still make the adjustment holes, we will see how it goes but if I start feeling flex its not the end of the world if I need to get a new one.
So that was a lot of force from the brake mount. If you're at all concerned about the frame, you could get a short piece of angle iron (3 inches) to put between the seat stay and bracket to spread the force and resist bending.
Could you explain this a little more? Just trying to work out where you mean, the disc brake mount is a lot more solid than the cheap one I was using before but would like to strengthen then frame as much as possible as well

Turbotd04   100 mW

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Re: Lowrider eBike project

Post by Turbotd04 » Dec 13 2019 12:15am

wheelbender6 wrote:
Dec 12 2019 10:56pm
I love this thread. I recently finished my banana seat bike (Sears Spyder replica) build. I may have to add a hub motor.
Congrats! Yeah I haven't seen a 20" lowrider style bike with a motor before so fancied giving it a go! Stay tuned as going to be swapping the crank over soon as the ground clearance isn't enough with the 170mm Bafang cranks

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E-HP   100 kW

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Re: Lowrider eBike project

Post by E-HP » Dec 13 2019 11:55am

Turbotd04 wrote:
E-HP wrote:
Dec 06 2019 12:49am
Turbotd04 wrote:
Dec 06 2019 12:25am

I was surprised how hard it was to bend back so there is still quite a bit of strength there I recon and now I haven't got the brake pressure on it it should be ok but if not I can just get a new one. The bend is to far up to be able to cut it and still make the adjustment holes, we will see how it goes but if I start feeling flex its not the end of the world if I need to get a new one.
So that was a lot of force from the brake mount. If you're at all concerned about the frame, you could get a short piece of angle iron (3 inches) to put between the seat stay and bracket to spread the force and resist bending.
Could you explain this a little more? Just trying to work out where you mean, the disc brake mount is a lot more solid than the cheap one I was using before but would like to strengthen then frame as much as possible as well
My thought is it probably isn’t necessary since the new mount is about twice as long between the axel attachment point and the end with the clamp, so a corresponding reduction in force applied there (the seat support had to endure twice the force of the current setup attached to the seat stay).
But, if you want to beef up that anchoring point, then either using a short piece of angle iron, or maybe a short piece of 3/4” steel conduit, cut in half lengthwise, and placed between the seat stay and clamp could spread the force out and provide a little more strength too.


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Turbotd04   100 mW

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Re: Lowrider eBike project

Post by Turbotd04 » Jan 08 2020 3:31am

Been away for a bit with Christmas and all that but back at the bike now. So ive gone from the bafang crank arms 170mm to 100mm unicycle crank arms to give me more clearance and they look like they are going to be a lot better for rideability.

Bafang crank arms
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100mm unicycle crank arms
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Have got a front wheel to match the rear wheel on the way and think ive got everything to get the light circuit going now so its all coming together nicely! Will be ready for summer

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thundercamel   1 kW

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Re: Lowrider eBike project

Post by thundercamel » Jan 08 2020 5:19pm

I didn't realize that bottom bracket was so low!
My Ebike builds - Existing bikes, affordable motor kits, self built 14s6p batteries - Now with more recumbent!

Turbotd04   100 mW

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Re: Lowrider eBike project

Post by Turbotd04 » Jan 10 2020 2:55am

thundercamel wrote:
Jan 08 2020 5:19pm
I didn't realize that bottom bracket was so low!
Yeah it would have only been a matter of time before I caught the old ones going around a corner ha

Turbotd04   100 mW

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Re: Lowrider eBike project

Post by Turbotd04 » Jan 11 2020 5:44pm

Have addressed the rear brake issue completely now and thats gone from the weakest to probs the strongest part of the bike, following E-HP idea about the half pipe I got a 1/2" x 8" galvanised steel connector pipe used for plumbing from Home Depot and went to work turning that into a strengthening plate for the lower tube. Heres some pictures.

Started off with this
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Needed it to be 4" 1/4 long so started cutting it down and shaping it
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Then thought I would add some holes so the jubilee clip could grip on the top a bit as well
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Trial fitting
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Painted and fitted
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