Lightest DOT compliant 16" moped wheels?

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The Toecutter   10 kW

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Lightest DOT compliant 16" moped wheels?

Post by The Toecutter » May 17 2020 12:10pm

I know there are builders here who have laced hub motors to 16" moped wheels, and that the diameter is almost a perfect match for 20" bicycle wheels, and that motorcycle tires to fit 16" moto rims and 20" bicycle tires to fit 20" bicycle rims are usually interchangeable when it comes to size.

That said, I am designing something that requires the stoutness of a motorcycle wheel because it will be capable of sustained highway speeds, but weight is also a concern because the vehicle will still need to be operable via pedaling with the motor turned off. I am planning to fit them with Mitas MC2 low rolling resistance tires rated for 100 km/h. Ideally, the wheels will also be DOT compliant.

I've done many searches on motorcycle, moped, and scooter wheels and data regarding weight/mass is scarce. Does anyone have any information on 16" motorcycle wheels they've either bought or built or links to builds that have used 16" motorcycle wheels?

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The Toecutter   10 kW

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Re: Lightest DOT compliant 16" moped wheels?

Post by The Toecutter » May 22 2020 10:21pm

I came finally across a 16" rim that had its weight listed(I've found it is rare for these figures to be listed):

https://www.mopeddivision.com/part-type ... gloss-1-5/

Universal Moped Rim - 36 Spoke 16 Inch - Black Semi-Gloss - 1.5", listed as 2.3 lbs.

That is not at all bad. With a hub and spokes, it is conceivable that an entire wheel could be built up that weighs under 6 lbs, fully ready for doing highway speeds. It would fit a Mitas MC2 16x2.25 tire.

goatman   100 kW

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Re: Lightest DOT compliant 16" moped wheels?

Post by goatman » May 23 2020 12:44am

bike tubes in 20x2.50 are hard to find right now, never thought of looking at moped tubes, amazon says I can get them by May.28 :thumb:

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Overclocker   10 kW

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Re: Lightest DOT compliant 16" moped wheels?

Post by Overclocker » May 23 2020 2:12am

Image

this is a 1.2 x 17 rim. 680 grams only

tire is 2.5 x 17 knobby. 2000 grams

sorry no links. local shop

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The Toecutter   10 kW

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Re: Lightest DOT compliant 16" moped wheels?

Post by The Toecutter » May 24 2020 12:32pm

Nice! How much does the entire wheel weigh in at, tire, hub motor, spokes, all included? What make/model of hubmotor are you using?

This will allow me to get an idea of how much weight I will need to devote to three wheels since the vehicle I am designing requires three wheels!

One motor for the rear wheel(for now, at least until lighter, more efficient, more powerful hub motors with very low cogging losses come onto the market so that I can consider FWD or AWD setups), and two front wheels. I need the wheels to be able to handle 60 mph cruising speeds with occasional forays into the triple digits when no one is looking and road conditions are appropriate. I'm trying to build a vehicle that is under 100 lbs ready to ride, unladen with tools/parts/rider, but equipped with motor/controller/battery/charger and with a full suspension and a full body shell on it to cut wind resistance and allow all-whether operation. I'm looking at making a 10+ kW beast with extreme aerodynamic efficiency, as it needs to be efficient enough that a very fit rider can turn the motor off and cruise at 20+ mph on flat ground and sprint to 40+ mph, just strictly pedaling it, cogging losses and heavy rotational inertia included.

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Re: Lightest DOT compliant 16" moped wheels?

Post by john61ct » May 24 2020 12:34pm

Would like to see that sort of frame geometry full rear suspension but with a real cargo rack, carry say 50+lbs.

John in CR   100 GW

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Re: Lightest DOT compliant 16

Post by John in CR » May 25 2020 1:51am

john61ct wrote:
May 24 2020 12:34pm
Would like to see that sort of frame geometry full rear suspension but with a real cargo rack, carry say 50+lbs.
Make that same rack with a well designed truss structure and 50lbs should be simple using the same material as long as the connections to the bike are adequate for the load. In fact, with those dual triangles it wouldn't take much to make it capable of 50lbs...a few more triangles inside each triangle along with some cross triangulation of the two should get the job done with little added weight. Personally I'd make it match the bike better and use .75" tubing and the same design could handle it, though I'd go further and divide the large triangles into 2ea using a cross support for lateral rigidity to make it passenger capable once I figured out a place for their feet.

John in CR   100 GW

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Re: Lightest DOT compliant 16

Post by John in CR » May 25 2020 1:57am

John in CR wrote:
May 25 2020 1:51am
john61ct wrote:
May 24 2020 12:34pm
Would like to see that sort of frame geometry full rear suspension but with a real cargo rack, carry say 50+lbs.
I agree. Great looking bike, but the rack looks spindly, so a beefed up rack would enhance the look IMHO. If it's just about strength that same rack with a well designed truss structure should make 50lbs simple using the same material as long as the connections to the bike are adequate for the load. In fact, with those dual triangles it wouldn't take much to make it capable of 50lbs...a few more triangles inside each triangle along with some cross triangulation of the two should get the job done with little added weight. Personally I'd make it match the bike better and use .75" tubing and the same design could handle it, though I'd go further and divide the large triangles into 2ea using a cross support for lateral rigidity to make it passenger capable once I figured out a place for their feet.

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