What's the "real difference"? How much less rolling resistance is a 23 going to give vs a 25. WIll the 25 provide better traction/cornerign due to being slightly larger?
23 seems to be the most common size I see for the balance of performance and reliability. Any thinner and you increase your chances of flats. Thicker and rolling resistance slows you down.
A 25 would have a taller sidewall which I don't think would be better when cornering. It'll be a more cushionned ride.
Keep in mind that the differences between tires is really really small in terms of contact patch. EG--the average motorcycle with big fat tires (compared to a bicycle) has a contact patch of about a quarter. I doubt the difference in cornering would be very much going from a 23 to a 25c.
Not sure about rolling resistance, though.
Dont forget that most 25s tend to be wire beads. Wire beads are heavy. So not only do you have more rubber, you have some heavy wire in there adding more weight.
If you are thinking about changing your stock 25s to decent 23s, you're looking at one of the biggest bang for the buck upgrades. Tires change your whole ride.
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