Bought a Yuba Mundo
Well, I finally bought a Yuba Mundo. The owner's manual, seventeen pages joined with a staple, seems to consist mainly of warnings, with a few cautions thrown in, among which I thought the following particularly interesting:
"Never carry other riders or packages" !!! "When braking always apply stronger braking pressure to the rear wheel . . . . If the front brake pressure . . . is applied too strongly or quickly, the bicycle may flip forward." I find it hard to believe that a bicycle as long and massive as the Mundo could flip. |
Generic manual? Cycling is extremely dangerous. :rolleyes:
Aaron :) |
You need two helmets to ride that thing :).
We need pix! |
"When braking always apply stronger braking pressure to the rear wheel . . . . If the front brake pressure . . . is applied too strongly or quickly, the bicycle may flip forward." I find it hard to believe that a bicycle as long and massive as the Mundo could flip. In the situation described in your owner's manual, I don't think they were saying the Mundo would flip over your head if that is what you were thinking. But there is a good chance that it will flip to your left or right side in the right set of circumstances. In less extreme circumstances you will likely experience this as the bike doing a "shimmy" from side to side when you stop. |
Well that's an interesting explanation.
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Originally Posted by MadCityCyclist
(Post 14959423)
No, it's simple physics. If you brake the front wheel more than the rear, the rear wheel moves faster than the front wheel and try to move around it, especially if there is more weight on the back. It's like a car braking on ice and then fishtailing, or a rear wheel drive car going up a hill on ice and stepping on the gas, which results in fishtailing. Trust me on this, I'm an engineer. If you know anyone who is a professional truck driver they will tell you basically the same thing. With the big trucks, they cannot even maintain the same speed going up a hill on ice because they will fishtail (although moving at the same speed, power is applied to the rear wheels going up a hill to maintain a constant speed, and the power that the rear wheels have but the front wheels don't have means that the rear wheels try to move in front of the front wheels). On ice, big trucks have to use the momentum of the downhill run to carry them up the next hill so they don't have to step on the gas. It's basically the same principle with stopping a cargo bike, in less dire circumstances of course. The rear wheel can't have more energy than the front wheel or it will find a way to move ahead of the front wheel, which isn't good.
In the situation described in your owner's manual, I don't think they were saying the Mundo would flip over your head if that is what you were thinking. But there is a good chance that it will flip to your left or right side in the right set of circumstances. In less extreme circumstances you will likely experience this as the bike doing a "shimmy" from side to side when you stop. By the way, later in the Mundo manual they do mention that braking too hard w/ the front brake could cause the rear wheel to lift off the ground so I think when they warn of flipping the bike they are referring to endo'ing. Disclaimer: I too am an engineer (or enginerd depending on your perspective). |
Originally Posted by MadCityCyclist
(Post 14959423)
No, it's simple physics. If you brake the front wheel more than the rear, the rear wheel moves faster than the front wheel and try to move around it, especially if there is more weight on the back. It's like a car braking on ice and then fishtailing, or a rear wheel drive car going up a hill on ice and stepping on the gas, which results in fishtailing. Trust me on this, I'm an engineer. If you know anyone who is a professional truck driver they will tell you basically the same thing. With the big trucks, they cannot even maintain the same speed going up a hill on ice because they will fishtail (although moving at the same speed, power is applied to the rear wheels going up a hill to maintain a constant speed, and the power that the rear wheels have but the front wheels don't have means that the rear wheels try to move in front of the front wheels). On ice, big trucks have to use the momentum of the downhill run to carry them up the next hill so they don't have to step on the gas. It's basically the same principle with stopping a cargo bike, in less dire circumstances of course. The rear wheel can't have more energy than the front wheel or it will find a way to move ahead of the front wheel, which isn't good.
In the situation described in your owner's manual, I don't think they were saying the Mundo would flip over your head if that is what you were thinking. But there is a good chance that it will flip to your left or right side in the right set of circumstances. In less extreme circumstances you will likely experience this as the bike doing a "shimmy" from side to side when you stop. |
Originally Posted by badmother
(Post 14964989)
Your description of the truck on ice reminds me of driving a Volvo 242 on ice. Those were the days..
Aaron :) |
Originally Posted by wahoonc
(Post 14965913)
I had a 144 with studded tires...what was the problem? :D
Aaron :) When I was young I used to go fast with my horse and a long low sledge behind it. Since it was lighthly loaded (me) it would fishtail a lot. Great times. |
Originally Posted by badmother
(Post 14965976)
Ok, maybe I had a tendensy to drive on "not so studded tyres". :rolleyes:
When I was young I used to go fast with my horse and a long low sledge behind it. Since it was lighthly loaded (me) it would fishtail a lot. Great times. First snow fall regardless of car I was always the first into the mall parking lot to have fun on the made to order skid pad. Aaron :) |
On a loaded longtail or a tandem, it is often possible to skid the front wheel (almost certain to cause a crash) before the rear wheel lifts. On a half-bike the rear brake is only a backup on pavement, but with a long wheelbase you need to use it to stop in minimum distance.
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