Only problem for carpet racing is that they are all 26mm. Jaco did have success a couple years ago with a 26mm rim, but most seem to like 28mm rims. Not to mention they don't give a rim diameter.
Still, at $10 a pair, I think a lot of guys would be willing to try them.
edit:xe.com says 6.64 GBP is $13, but still not bad.