Hi, I am new to road cycling and just bought a Specialized Roubaix Elite Triple (2007) last week and I am loving it. I bought a sigma sport computer (BC906) model and am actually going to give it to my boyfriend and upgrade to the one with cadence pretty soon. But I wanted to have something to play around with.
My question has to do with the wheel size. I think I have it right, but want to make sure. The wheel is a Specialized Roubaix Pro, 700x23/25c, aramid bead, 120TPI. What is throwing me off is what does the 25c mean in the description of the tire? Is the tire a 700X23 tire? If so, I set the computer to 2133 as stated in the instructions. Is that right?

Thanks for your help! Everyday I can't wait to leave work so I can go ride.