Just picked up a pair of Continental 29r X King tires. They are labeled as 2.4" tires. On the stock rims on my Santa Cruz TallBoy they measure a whopping 2.1". Not at all what I had hoped for. :-( The outer width of my rims is .9". The stock "2.1 tires" measure a bit under 2" on a slightly wider rim. At least that is sort of close to what is claimed.

My question I guess, is whether rim width hugely effects final tire width or whether Continental is just full of ... claiming a 2.4" width.