Just curious really,
At what speed are 23 faster than 25?
23's are aerodynamically faster than 25's but 25's roll better?
So at some point aero beats rolling.
Anyone know what that point is?
There's a lot of chatter about this but personally I find 25s feel more comfortable for no appreciable speed loss; we don't have very smooth roads. They last longer too. 23s go square quicker.
(I've not answered your question have I?)
23's are only more aerodynamic depending on the rim to which they are mounted, at the end of the day it's all minimal gains.
Cyclist mag had an interesting article about this a few months ago.
I can't feel any more drag on 25's but a swap to the same tyre in 23 seems to create a less pleasant ride. Never really ridden 23's though as I went from tubs to 25's.
I was a confirmed 25mmer but you can now only get the particular Michelins I like in 23mm. Obviously 'other brands are available' and I shall do some research.
Definitely second the comments about wear, 23mm seem to wear significantly faster than 25mm
I've just been surprised at how fast 25's can be, in particular how fast you can go on a set through bend after bend.
I noticed a few City Centre series guys had 25's.
Where as once I saw them as a slower or training tyre I now see them a race tyre for the right course. And although it's just 2mm the difference looks and feels far greater.