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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 07-01-16, 11:39 AM   #1
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700x23 vs. 25's?

I'm running a pair of Specialized Pro II's in 700x23. They will need replaced before too long, I'd imagine in the next month or so.The ride on these is plenty fast, but stiff and jarring on our Pennsylvania roads. For commuting they are fine but as I get into longer adventures, they are starting to beat me up a little.

I am considering going to a 25, but will two extra mm. make all that much difference in the ride?
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Old 07-01-16, 11:48 AM   #2
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None whatsoever. Mainly, a 25mm in the front will slow down the steering a tad. I run 23 front 25 rear on several of my bikes. It allows me to drop the pressure in the rear by 10 psi w/o risking a pinch flat.
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Old 07-01-16, 11:57 AM   #3
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How large of a tire will you frame/fork accept? Is speed/time important to you on the long rides?
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Old 07-01-16, 12:16 PM   #4
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How large of a tire will you frame/fork accept? Is speed/time important to you on the long rides?
Its my Kilo TT, and its my understanding that it will not take a 32. I'd have to take some measurements, though.
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Old 07-01-16, 12:31 PM   #5
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Have you considered 28mm tires?
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Old 07-01-16, 01:14 PM   #6
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A friend of mine once said: You'll still be able to feel that penny you ran over, but you won't be able to tell what year it was minted.
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Old 07-01-16, 02:11 PM   #7
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Have you considered 28mm tires?
Not yet. I suppose I should, though.
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Old 07-01-16, 02:34 PM   #8
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go to 25mm. I am a tall large man, but the only thing I noticed TRULY was better ride quality.
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Old 07-01-16, 04:16 PM   #9
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A friend of mine once said: You'll still be able to feel that penny you ran over, but you won't be able to tell what year it was minted.

Love it!
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Old 07-01-16, 08:47 PM   #10
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It wasn't yooooge difference going from 23-25 but I did notice it a little in a more comfortable ride not by a ton but ever so slightly. Though if you can go 28 go for 28 and you will be even better.
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Old 07-02-16, 03:25 PM   #11
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None whatsoever. Mainly, a 25mm in the front will slow down the steering a tad. I run 23 front 25 rear on several of my bikes. It allows me to drop the pressure in the rear by 10 psi w/o risking a pinch flat.
I have a friend who runs a conti 4000s 28 in the rear and a vittoria rubino 23 in the front for exactly the same reason.
She reports greater comfort mostly from the decreased tire pressure in the rear.
( I'm still running 23s on both wheels. I know wider tires will most likely be comfier but....reasons)
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Old 07-02-16, 07:55 PM   #12
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My experience is that the difference will be significant.

I purchased two pair of Vittoria Rubino Pro III Slick tires identical except for width. One pair was 23 and the other were 25's. They were tested back to back to back - same rider, same bike, same wheels, same tubes, same pressure, same roads, same day. The 23's went on first and then the 25's. The 25's were noticeably more comfortable and took less pedal effort. I could tell as soon as I started pedaling. To be sure I put the 23's back on and could tell the difference again immediately.

I left the 23's on for about ten months. The rear got a cut two weeks ago and I put the 25's on and it is much better.

This is my experience. Other people may have had a different experience but this is mine.


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Old 07-03-16, 10:25 AM   #13
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same pressure,
Interesting tidbit.
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Old 07-03-16, 10:30 AM   #14
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My experience is that the difference will be significant.

I purchased two pair of Vittoria Rubino Pro III Slick tires identical except for width. One pair was 23 and the other were 25's. They were tested back to back to back - same rider, same bike, same wheels, same tubes, same pressure, same roads, same day. The 23's went on first and then the 25's. The 25's were noticeably more comfortable and took less pedal effort. I could tell as soon as I started pedaling. To be sure I put the 23's back on and could tell the difference again immediately.

I left the 23's on for about ten months. The rear got a cut two weeks ago and I put the 25's on and it is much better.

This is my experience. Other people may have had a different experience but this is mine.


-Tim-
Why did you leave the 23s on, after that test???
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Old 07-03-16, 12:54 PM   #15
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Why did you leave the 23s on, after that test???
I paid for them so figured I should use them. Have been riding 23's my whole life and so it wasn't like a step back.

Also pride. The 23's are blue and match the bike. The 25's are black. Should have disclosed the color difference.
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Old 07-03-16, 01:47 PM   #16
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The bike takes more of a beating on a FG since coasting and getting weight off the saddle to roll over rough sections is out. That beating gets transmitted to the rider more on narrow low TPI tires running high pressures than wider supple casing tires running at lower PSI.

For me at 160lbs good quality 25mm tires at ~90 PSI provide an acceptable ride on our chip seal roads without feeling slow. Try something different than the OEM set-up and see how it works for you.

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Old 07-03-16, 09:25 PM   #17
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My experience is that the difference will be significant.

I purchased two pair of Vittoria Rubino Pro III Slick tires identical except for width. One pair was 23 and the other were 25's. They were tested back to back to back - same rider, same bike, same wheels, same tubes, same pressure, same roads, same day. The 23's went on first and then the 25's. The 25's were noticeably more comfortable and took less pedal effort. I could tell as soon as I started pedaling. To be sure I put the 23's back on and could tell the difference again immediately.

I left the 23's on for about ten months. The rear got a cut two weeks ago and I put the 25's on and it is much better.

This is my experience. Other people may have had a different experience but this is mine.


-Tim-
I had the same experience. Ran them back to back and left the 25's on.
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Old 07-03-16, 09:33 PM   #18
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I paid for them so figured I should use them. Have been riding 23's my whole life and so it wasn't like a step back.

Also pride. The 23's are blue and match the bike. The 25's are black. Should have disclosed the color difference.
I rode some red tires for a year, given I paid for them...
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Old 07-03-16, 10:37 PM   #19
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I rode some red tires for a year, given I paid for them...
I'm glad.

Blue tastes better IMO. That's just me tho.
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Old 07-03-16, 10:48 PM   #20
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I'm glad.

Blue tastes better IMO. That's just me tho.
How stoned do you have to be to think about blue tires tasting better than red tires?
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Old 07-04-16, 10:47 AM   #21
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How stoned do you have to be to think about blue tires tasting better than red tires?
Not very. It's an important decision though, and should be made while sober.


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Old 07-04-16, 11:16 AM   #22
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How stoned do you have to be to think about blue tires tasting better than red tires?
Bring back the 1980's and I'll let you know.

Getting stoned is so Bill Bennett era-ish anyway. Even the deep south has moved on to Pilates, Whole Foods or the crystal meth option.


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YIKES! Check out Frank's fingernails.
Frank is a bit effeminate now that you point it out. The count on the other hand...

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Old 07-04-16, 02:09 PM   #23
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It's been tested quite a bit, and everyone basically agrees that a 25 is faster than a 23. As far as comfort goes, I've found it's noticeable, but not to an extreme amount. Between same-make (GP4000S) tires, I run the 25s about 5psi lower than the 23s, so that's probably most of the benefit. I'm currently running 28mm Vittorias, and they're far more comfortable than 23mm tires of any make I've ridden in the past.
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