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5

To expand this, a 1.5 ton car with 100 horsepower is ~75,000 watts or 50 watts per kilo. A 100 kg cycle+rider doing 250 watts is 2.5 watts per kilo, so approximately 1/20th that of the car. The motor vehicle has much more power to burn (ie waste) on overcoming rolling resistance from hefty tyres.
– Criggie ♦
Commented Jun 28, 2020 at 21:02
1

a 1.5 ton car doesn't use all the 100 horsepower when coasting. it may use 10-30 horsepower to maintain a 100 km/h speed. @Criggie
– Mark Segal
Commented Jun 29, 2020 at 11:47
@MarkSegal Which is still insanely overpowered, imho...
– cmaster - reinstate monica
Commented Jun 29, 2020 at 11:57
1

@MarkSegal We're diverging from the purpose of comments. Feel free to use Bicycles Chat
– Criggie ♦
Commented Jun 29, 2020 at 12:06
4

Steel belts in car tires are not for puncture protection. You simply need reinforcement in a tire which must withstand a couple of tons, and steel happens to be suitable and cheap. Incidentally, it also protects against punctures somewhat.
– Dmitry Grigoryev
Commented Jun 30, 2020 at 8:35

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