Skateboarders v cyclists..amazing footage

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Vantage
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Re: Skateboarders v cyclists..amazing footage

Post by Vantage »

Fair enough :mrgreen:
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[XAP]Bob
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Re: Skateboarders v cyclists..amazing footage

Post by [XAP]Bob »

No disputing t skill, or their bravery...
A shortcut has to be a challenge, otherwise it would just be the way. No situation is so dire that panic cannot make it worse.
There are two kinds of people in this world: those can extrapolate from incomplete data.
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Si
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Re: Skateboarders v cyclists..amazing footage

Post by Si »

I'm also guessing that the boarders had to be a bit choosy about which hill they used - whereas the cyclists could chuck themselves down most tarmacked hills. As demonstrated by Guy Martin the other week when he tested different wheels on the same cart, the skate/luge wheels massively underperformed compared to bike wheels. If he'd have picked a velodrome smooth bit of road then things would have been closer.....but when was the last time you found a long, perfectly smooth bit of road, eh?
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Re: Skateboarders v cyclists..amazing footage

Post by SilverBadge »

Mick F wrote:Just a quickie calculation.
1 mile is 63,360 inches.
60mph is 1 mile per minute.
27" bicycle wheel is 85" circumference.
2" skateboard wheel is 6.3" circumference.

At 60mph .....
27" bicycle wheel is doing 745rpm
2" skateboard wheel is doing over 10,000rpm.
For Thrust2 land speed record car ~630mph, wheel diameter was dictated by the "centrifugal" stresses, smaller and the higher rpm would have resulted in self-destruction. Bearings had to be pretty clever too.
In all this footage the following car is not struggling to keep up in the corners. It's probably easier to corner near the theoretical limit on a board as overstepping the mark is less catastrophic. No idea what the friction coefficient is for urethane wheels, or how grip would drop off on rougher tarmac. Ventoux descent shows filmed cyclist vastly quicker than other cyclists, so what does that prove?
Not sure which bit of Ventoux Guy Martin chose, couldn't see the point of a push start etc as the limiting factor was the last bend he had to brake for before the timed section. Get the speed and exit through there spot on, easiest with minimal braking beforehand and your terminal/timed velocity will be highest
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