The wheelchair application seems to run straight into the eternal problem with sprung wheels. Without dampers, they bounce badly, as sometimes seen in tractors fitted with buckets on a bad road. With dampers, they have very high rolling resistance. I tire needs enough flex to meet the ground, but any further suspension should be on the axle. Lardo January 30, 2018 06:00 PM
One designer wants to increase shock absorption in mountain bikes by replacing standard spokes with shock-absorbing coils. Triple the shocks, triple the fun!
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The spokes on a standard spoked wheel hold it in tension. If the spokes lose tension, they start to break and the rim will buckle. A Loopwheel is not held in tension by its springs.
“In the past, if I wanted to go down the sidewalk or over any big bump in a regular wheelchair, I’d feel it a lot on my back, and it would really hurt. You do it a couple of times a day each day, a week, a month, a year – you’re talking about thousands of times,” Cohen told From the Grapevine. “With Acrobat, it's all absorbed into the wheel and not in the back, creating a better sensation when riding a wheelchair.”
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The latest idea to come across our desks, though, makes a compelling business case for itself as well as offering some interesting dynamic capabilities. Meet the Air Suspension Wheel (ASW), from Global Air Cylinder Wheels out of Chandler, Arizona.
Things turn even further in the favor of the ASW system if you factor in punctures, blowouts, tire fires and how long a truck has to be out of service each year while those monster tires get changed. ASW treads are bolt-on, bolt-off chunks that can be changed with very little gear, without even jacking any wheels up, and done in sections during shift changes and lunch breaks so the truck's never out of service due to tires. They can also ship much more cheaply, since the whole assembly can be broken down into bits that easily fit in a regular shipping container.
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Loopwheels are designed with suspension within the wheel itself: in place of rigid spokes, they have three loop-shaped springs.
Editor’s note: This article originally appeared in Q2_2020 of quattro Magazine and on our sister site, e-tron connect. If you would like to subscribe to quattro Magazine, please join Audi Club here.
The big limitation that I can see, is that if there is any deflection when the rider gets on the bike, that means that the rider is essentially pedaling uphill all the time (Because he has to compress the springs as he moves forward). The other problem is that unless the springs are precisely calibrated to the riders weight this will really destroy the rolling efficiency of the bicycle. Malcolm Jacks May 23, 2020 03:09 AM
Loopwheels are different from spoked wheels. They look, feel and perform differently. You will be used to a wheel being a rigid thing, Loopwheels have flexibility in them in order to provide vibration reduction. The hub moves within the rim as the springs flex. The whole wheel acts as a flexible moving system which constantly adjusts to the load it carries and the obstacles it encounters.
Just purchased a 2nd Traxion for my wife; after she borrowed mine she had to have one. This one arrived in perfect condition via UPS. Had to fine tune the brakes and shifters but that is easy. The people here having pedal/crank problems are causing the problem themselves by installing them dry and severly over tightening them. Put a little grease on the threads and take them down to just beyond finger tight. They are threaded opposite of the crank rotation and will not back out, and if you ever need to replace them they'll come out easily without seizing or galling. Great bike for the money!
The LBR Review Team is back with Peter Stull doing a review of the Greenspeed Magnum BW and Larry Varney evaluating the Steintrike Wild One.
After building a PacMac track in its previous video in the Cat Trials series, Caterpillar set up a mock Hot Wheels race track featuring a variety of Cat equipment and life-sized versions of Hot Wheels cars.
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