Wikipedia:Articles for deletion/Tubular tyres
I've seen nominations like this before.  Common objects articles that are still in the stub stages and a misguided user believes the topic is un-encyclopedic because so far they see only a "definition."  Not only does its commonness make it encyclopedic (can easily be expanded to its history and variations plus many other details), but as Colonel Warden pointed out, it's the subject of secondary coverage included an whole book, the primary criteria of 
— User:Oakshade, 15:02, 24 June 2008 (UTC)
Stance: keep
Cited policy: WP:N (Wikipedia:Notability)