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Look at the date that video was posted.
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Has anyone tried helium in their tires?
It was a thing on elite level track bikes in the olden days. While the diffusion rate is higher than for air or nitrogen, it wouldn't be an issue for a one hour CX race. It's also the source of a legendary (or perhaps mythical) tale of Secret Squirrel psy ops in the first decade of the 21st century when Team GB painted their compressed air cylinder to look like Helium in order to trick the Australian team into wasting money
Colonel_of_Truth
gbj_tester
@Zane
I'm really into cyclocross, and everyone wants to make their bike lighter and I've just stumbled across helium filled tires! https://www.youtube.com/watch?v=t8upKwOrXRU
. Has anyone tried helium in their tires? I'd be interested to know how long the tires lasted.