Any question answered...

WTF is the seat clamp size for a Fuji Roubaix Pro (the 853 one)? I've tried measuring it but my micrometer is cheap and crappy, can't get a definitive reading. Have tried googling and thought I'd got it when I discovered the front mech fits at 28.6 therefore the seat post clamp should be 28.6, non? No, I bought a 28.6 clamp off the bay, which arrived this morning but it's too tight even if I try forcing it with lube. Seat post is 27.2.

Does anyone know?

Just out of interest (I know you already have your answer) which year is this roubaix pro from?