[url=
of the disadvantages of lightweight bikes[/url] 🙂
Genuine, fake or web based promotion?
money on viral advertising
Quick back of the envelope calculation
Density of air is 1.25 kg/m3
To lift a 12.5 kg bike (27lbs) you need to displace 10m3 of air
Assuming a gas of zero density you'd need a balloon 2.66 metres in diameter. (Can't be bothered to work out what size you'd need for a helium balloon, but it would be larger)
Balloon in video is clearly less than 2.66m (looks less than 1m) therefore it's a fake.
You only have to look at the way the bike isn't dangling or swinging about to know it's fake. Fun though 🙂
What if the bike was nearer 20lb?
Yeah, but that's a Swiss balloon, not your common old tat bit of rubber 😉
Stop it Matt, I'm supposed to be working.What if the bike was nearer 20lb?
Oh, alright then
You need roughly 1m3 of helium to lift 1kg
So 20lbs (9kg) needs 9m3 of helium, giving a balloon 1.6m (about 5 foot) in diameter.
[i]Although that doesn't really work because in order to inflate the balloon the helium would need to be under pressure so would weigh more so the balloon would need to be bigger than that.[/i]
And they could've filled the tyres with helium...
Yes, but, it's a 29er balloon... 🙂