I was thinking about this the other day…skateboards are flexible, bike tires are bouncy. Why aren’t there “performance” skates with shocks? Wouldn’t that be better for your knees?
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On skates you push with the skate against the ground to accelerate. If you had spring you would first need to press against the spring and then against the ground to do the same acceleration. So it would be a lot harder or slower. On a skateboard you push with the leg that isnt on the board so there also isnt a bouncy thing in between. And for bikes there is also nothing to compensate between the pedals and the wheel.
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