700C rim suggestion needed for hub motor

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Dave in Hawaii   1 µW

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700C rim suggestion needed for hub motor

Post by Dave in Hawaii » Mar 15 2017 9:45pm

Hi,

I plan to take a Bionx hub motor from my Bike Friday and move it over to my old 700C Atlantis.

I'm not sure which rim would be the best. I'm considering the 2" wide Marathon Supremes. Bionx does sell a rim but it appears to be 18mm or 20mm internal width rim. I'd prefer something a little wider and I'm considering the Velocity Cliffhanger and Ryde Andra 35. I weigh about 220 lbs. I might be carrying a moderate load at times. I don't know much about rims. I just want something that I won't have issues with.

http://www.ryde.nl/andra-35

It's going from a disk brake on the Bike Friday to a rim brake on the Atlantis. That shouldn't be an issue, right? The dropouts are both spaced 135mm.

Thanks for the help,
Dave

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MadRhino   100 GW

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Re: 700C rim suggestion needed for hub motor

Post by MadRhino » Mar 15 2017 10:10pm

Beware, many rims are disc brake specific today, the wide ones especially. Going to rim brakes, you need a rim that is surfaced for the brake pads to grip. So, checking the rim specs, you need to select one that is 700C 36h rim/disc and the width that you want.

Then, if you want the best, you can check those that are welded seam, double wall, MTB rims.
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Ykick   100 GW

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Re: 700C rim suggestion needed for hub motor

Post by Ykick » Mar 15 2017 10:11pm

Should fit ok but the RPM/Volts may be less than ideal going from a small wheel to a larger diameter wheel.
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Re: 700C rim suggestion needed for hub motor

Post by ScooterMan101 » Mar 15 2017 11:03pm

I have done all the research for the rim that you need, as I have a 700c bike myself.

Here is the best rim that has all the features you need.

This is what I bought ... http://www.jensonusa.com/DT-Swiss-TK540 ... m?cs=Black

Get the 36 hole one if that is the spoke count on your present hub motor.

What RPM and Make / Model of motor do you have ?

Ykick and others have experience with different RPM Hubs and wheel sizes.

You might have do drop down in voltage .
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Dave in Hawaii   1 µW

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Re: 700C rim suggestion needed for hub motor

Post by Dave in Hawaii » Mar 16 2017 12:59am

Thanks for the input guys.

The Bionx is a P 350 DX from 2016. I'm not sure about the other technical details. I did double check with Bionx about moving from a 20" wheel to 28" and they said it would not be an issue. It will be interesting to see how much of a power loss there is. It definitely does well with the Bike Friday. Overall, I'm really impressed with the system...especially how seamless the assist is. It feels very natural compared to a Grin system I have on a tandem.
I have done all the research for the rim that you need
Those DT Swiss rims do look primo. It looks like those 2 inch wide tires can go on those rims without an issue.
Beware, many rims are disc brake specific today, the wide ones especially.
Thanks for the reminder. The Cliffhanger and Andra are both for rim brakes.

I appreciate the help,
Dave

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chas58   10 kW

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Re: 700C rim suggestion needed for hub motor

Post by chas58 » Mar 17 2017 5:19pm

Bionix is wrong.

Dave, we have seen that picture before - from back when you were designing your tandem. Nice bike!

If your 20" wheel did 22mph unloaded (for example) it would need to do 31mph on a 700c wheel. For most people this doesn't work.

Your best bet would be to go to a 24v battery (and increase the current) to get the speed of the wheel of the 700c to match that of the 20" wheel. Other wise you will be generating a lot of heat and causing problems.

Also, I like to go to em3ev and see what rims they are offering.
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Re: 700C rim suggestion needed for hub motor

Post by LewTwo » Mar 18 2017 8:44am

I suspect that frame is going to allow you a very limited choice of tire width 32c or 38C max. So getting wide wheel is not going to make much difference. I would think anything over 20mm inside would suffice.
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Dave in Hawaii   1 µW

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Re: 700C rim suggestion needed for hub motor

Post by Dave in Hawaii » Apr 28 2017 2:19am

Hi guys,
I was too far into the project to turn back. I went with the Velocity rims and 2" tubeless tires. Overall, I'm very happy with the end result. The motor provides plenty of power and the Bionx is so smooth. The big Atlantis frame seems like a very good host for the motor.

Here's some photos from today to my favorite spot.

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mark5   100 kW

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Re: 700C rim suggestion needed for hub motor

Post by mark5 » Apr 28 2017 2:24am

Dave in Hawaii wrote:Here's some photos from today to my favorite spot.
Is that Hoomaluhia?

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Dave in Hawaii   1 µW

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Re: 700C rim suggestion needed for hub motor

Post by Dave in Hawaii » Apr 28 2017 3:11pm

That's the place. Sorry, here's some smaller photos.

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