Odd-looking bike ditches the chain
Apr 11, 2017 16:02:38 #
Apr 11, 2017 16:29:00 #
Apr 11, 2017 16:39:40 #
Interesting, but not as efficient as a conventional bike.
--Bob
--Bob
bcheary wrote:
http://newatlas.com/chainless-bike/48915/?
Apr 11, 2017 18:24:32 #
ken hubert wrote:
Don't think Trek has anything to worry about.
Interesting concept though!Apr 11, 2017 18:26:05 #
rmalarz wrote:
Interesting, but not as efficient as a conventional bike.
--Bob
--Bob
How would you compare efficiency? Energy expended over distance?
Apr 11, 2017 18:55:26 #
bcheary wrote: Interesting concept though!
Interesting concept though!Not stable around corners. At any speed it would be a guaranteed wreck!
Apr 11, 2017 19:11:52 #
Yup. When I raced bikes, we had some very close calculations as to seat height, top tube length, seat tube length, etc. Leg length, from seat contact point to knee, to ankle, etc. was involved in setting the seat height. Top tube length was related to a measurement between the pubic bone of the pelvis and the top of the breast bone, just below the adam's apple. All of this for efficiency. Maximizing the mechanical advantage of the rider/bike combination.
One of the measurements that was also important was when the pedal was just about horizontal to the ground. A plumb bob suspended from just below the riders kneecap should point to the ball of the foot, with the foot secured to the pedal. That is part of the seat setup fore and aft. Look at the rider's position with respect to the seat/pedal locations on that bike and that is very inefficient.
The reason was that lab tests showed that at certain set ups, less energy was expended. The rider is a fuel cell. The tank is not really refillable. I know eating on a bike during a race occurs, that helps, but still doesn't provide the immediate energy like filling a gas tank. So, the goal is to expend as little energy as possible, but still exert the necessary amount to be competitive.
--Bob
One of the measurements that was also important was when the pedal was just about horizontal to the ground. A plumb bob suspended from just below the riders kneecap should point to the ball of the foot, with the foot secured to the pedal. That is part of the seat setup fore and aft. Look at the rider's position with respect to the seat/pedal locations on that bike and that is very inefficient.
The reason was that lab tests showed that at certain set ups, less energy was expended. The rider is a fuel cell. The tank is not really refillable. I know eating on a bike during a race occurs, that helps, but still doesn't provide the immediate energy like filling a gas tank. So, the goal is to expend as little energy as possible, but still exert the necessary amount to be competitive.
--Bob
bcheary wrote:
How would you compare efficiency? Energy expended over distance?
Apr 11, 2017 21:50:48 #
rmalarz wrote:
Yup. When I raced bikes, we had some very close ca... (show quote)
Thanks for the lesson Bob. I will have to remember all that when I am riding my beach cruiser!
Apr 11, 2017 21:51:49 #
ken hubert wrote:
Not stable around corners. At any speed it would be a guaranteed wreck!
I wonder if the inventors will get around to correcting that?
Apr 11, 2017 21:57:29 #
bcheary wrote:
I wonder if the inventors will get around to correcting that?
No. See post above on bike tubes by Bob
Apr 11, 2017 22:01:37 #
Apr 12, 2017 08:08:52 #
birder585
Loc: Rochester, NY
It doesn't even look comfortable. More like pedaling a "crotch rocket".
Apr 12, 2017 10:24:27 #
It's like a unicycle with a front wheel.... I'm trying to figure out how they made it stand there with no stand. I've decided they shoved it out there and shot at 1/2000sec..... Nyms
Apr 12, 2017 12:40:16 #
Apr 12, 2017 15:46:24 #
birder585 wrote:
It doesn't even look comfortable. More like pedaling a "crotch rocket".
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