Quote Originally Posted by ttaylor508 View Post
So this thread is very timely for me as I was considering going with a skinnier tire. I currently have Specialized Roubaix 700 x 23/25c tires. DH has 700 x 23/23c and his tires are noticeably skinnier than mine. Does anyone know what the third number measurement means (/25c or /23c)?
I don't know why there are 3 numbers (usually there are just 2), but I do know that Specialized 23s tend to look a lot more like 25s. Depending on shape and tread, I've seen some 23s of other brands that look more like 20s.