is the "something" just that those are the approved building materials for njs/keirin bikes? i mean i dont know how costly it would be for columbus to have a special tubing set aside for such a small little niche. i'd imagine it's like: "ok, columbus genius tubing.... thats the one we will use." and boom, njs stamp and keirin approval. then all they do is change the name, or just add "keirin" to it. like how the njs dura ace hubs are exactly the same (mechanically speaking) as the non-njs stamped dura ace hubs with the same amount of spoke holes. you know?

like its not technically any different in any way, or maybe it is? thicker? diameter?

its just hard to believe, for a naive chap like myself, that there is an entirely special tubing - specially designed, specially made, etc - specifically for that market. but, then again, i've been amazed at similar things before. im not trying to argue or anything, i'm just curious because it's a curious subject. i realize the philosophy behind njs approval, and am interested by it. what gains the approval, what is so special, etc. thats all.