tire pressure: does this exist?

not according to the people who use them on track cars… looks like I’m not the first to think of this.

from evoM:

[quote=“VR4orceCJ”"]

Yup… Longacre sells them… You’ll have to drill an 1/8" NPT hole in your rims and set the relief pressure. Never used them myself but know of others that do and they like them.

http://www.longacreracing.com/catalog/item.asp?id=580&catid=9

[/quote]

how is this a bad idea… let’s hear your better idea on how to maintain tire pressure while on track?