Tire Size & Setting Up My Computer

[stpbound]

Hi all,

I was looking at my new road bike's tire size to figure out what size to input into my bike computer. The size on the tire says 700 x 23/25c. My options, according to the manual for my bike computer are 700x23 and 700x25.

Anyone know the right answer?

Thanks!
stpbound

[VeloVT]

That's actually what it says on your sidewall? Interesting... I wonder if the effective tire size for your tires depends on the PSI you're running??? Lower psi=more tire contacting ground=25 or higher psi=less tire contacting ground=23??? I've never seen anything like this before (so yeah, I don't know what I'm talking about !), but I would probably try to find more info on your tire specs by going to the manufacturer's website.

Maybe someone else will have a better idea though (or, well, know what they are talking about ! ).

[jobob]

Here you go!

http://www.sheldonbrown.com/cyclecom...ation.html#ccc

Scroll down to the Roll-Out Test.

[SadieKate]

stpbound, are you looking at the tire or the tube?

[Batbike]

stpbound, are you looking at the tire or the tube?

i agree with SadieKate -- sounds like you may be looking at tube versus tire. Tubes vary because they go on the inside of the tire, but tires usually come in one size -- what brand is your tire and what does it say on the sidewall?

[stpbound]

i agree with SadieKate -- sounds like you may be looking at tube versus tire. Tubes vary because they go on the inside of the tire, but tires usually come in one size -- what brand is your tire and what does it say on the sidewall?

The TIRE is the Specialized Roubaix Pro. It says 700x23/25c on the sidewall. I have not actually seen the tube yet...it's a brand new bike and luckily haven't had a flat yet!