700x23 to 700x25?

[Trichoclasis]

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[TrevA]

I run 25mm on my Allez with no problems, I’ve even had 28mm ones on it. The only problem may occur if you are trying to run them with full mudguards. My wife’s Dolce (Ladies version of the Allez) will only take 23mm tyres with mudguards fitted.

Tyre widths can vary between manufacturers, but I’ve had no problems running Continental tyres - Gatorskins, Grand Prix GT and I’m currently running 25mm GP5000’s on the Allez.

[pwa]

If you have a tyre size on your bike and are considering going up a size, a good starting point is to look at the clearances you have with your existing tyres. How close do they come to the brake callipers, the frame or the mudguards (if you use them) at the closest points? That will give you some feeling for how much space you have to play with. But you don't want to be reducing the space to something silly, like 2mm, because that sort of gap easily gets clogged with grit and mud, even on tarmac roads.

[Audax67]

^^^ That, and have a look at the seat tube clearance. My early-2000s Lapierre frame will take a 25mm but the clearance is about 2 mm. I can only get a 25 into it deflated.

Never had any trapped-crud problems, though.

[pwa]

^^^ That, and have a look at the seat tube clearance. My early-2000s Lapierre frame will take a 25mm but the clearance is about 2 mm. I can only get a 25 into it deflated.

Never had any trapped-crud problems, though.

I take it that you aren't doing a lot of winter cycling in the west of Britain then

[Audax67]

Nope. Bike & I don't like getting wet.

<anecdotage>
In the 90's I rode a Raleigh 'demi-course', basically a road bike built for pootling about with a carrier, panniers and 28 mm tyres, which vastly amused my usual riding partner, who had had a successful amateur racing career. One of the things I learnt from him was to put a hand (gloved) between seat tube and tyre after anything got stuck to the latter so as to brush it off.

In the early 2000's I 'graduated' to an MBK with modern shifters and 23mm tyres. On one ride with chums I was out ahead when I went through a patch of broken-windscreen glass and reached down as I had learnt on the Raleigh. The bike being a punter's version of the Cofidis TdF bikes of the era, clearances were much tighter, though, so that my hand was whipped round by the tyre and jammed solid between it and the seat tube.

Take a moment now to envisage the position: tooling along at ~25 kph, bent double and reaching back between legs, hand trapped immovably between tyre and frame, back wheel suddenly immobilized, unclipping left pedal, teetering right, waving left leg desperately to try and keep balance...

Amazingly I didn't break anything, but I had a bit of gravel embedded in one elbow for the next two years.

I don't try that manoeuvre any more.

</anecdotage>