I'm sure they are measuring seat tube to a virtual top as it's a compact frame so a 56 is a 54 cc. I'm make that assumption having looked at the geometry of a 58 which has similar numbers to the 56 cc frames I ride .. head tube is a bit more sportive though.
I'm sure they are measuring seat tube to a virtual top as it's a compact frame so a 56 is a 54 cc. I'm make that assumption having looked at the geometry of a 58 which has similar numbers to the 56 cc frames I ride .. head tube is a bit more sportive though.