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Bikes without chains
I've ridden a bicycle, but I've never seen a bicycle before, and today there was a kid who rode a bicycle without a chain on the way out of school, and he didn't pedal hard when riding, what is this?
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Indeed, there is a wrench-like on the pedals, which floats up and down with the foot, giving the rear wheel of the bicycle forward momentum.
According to the understanding, this bicycle generates the moment by applying force at both ends of the lever separately, the lever principle can double the force applied at a point or generate more force, during the riding of the bicycle, this principle can help the rider to apply force more efficiently, thus pushing the bicycle forward quickly.
Without a chain, there is less trouble for repairing the chain break in the later stage, which is indeed a good invention, but why is it not vigorously promoted, netizens have commented on it.
Such a bike can only be ridden on flat or downhill roads, it doesn't have enough traction, and it will be difficult to go uphill.
And the legs are not all-round movements, and the legs will not be able to stand it for a long time.
When I was a child, I made a wood electric drill, and the principle is actually the same as this.
This kind of rear bar power, the wear of the rear wheels will be very serious, although the chain is saved, but the tire wear is accelerated.
Pedal this car is afraid of failure, if the sudden failure, it is easy to cause leg damage, although the record is small, but the failure rate of this structure is much larger than the traditional one.
There is also a key question, this car does not have a chain, is it not able to slide, and needs to keep pedaling?
This kind of bicycle is still not perfect enough, if there is a benefit, then there will not be so many chain bikes on the market now, down to hundreds, up to hundreds of thousands, all chain.