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Tolerance for tire width?

Old 07-24-21, 03:32 PM
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6StringJazzer
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Tolerance for tire width?

I am replacing a tire that is 700x23c. I can't tell from the wheel what the size spec is, so I am going from the previous tire. The store only has a 700x25c in stock, and the guy tells me such a small change in width won't matter.

Is he right, or just trying to sell me a tire?
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Old 07-24-21, 03:35 PM
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He's right. Note, you'll inflate the 25s to a sightly lower pressure than the 23s.
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Old 07-24-21, 03:44 PM
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And you will get much more comf when riding it
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Old 07-24-21, 05:20 PM
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Thanks. The specs on the box do say that the pressure for 700x23c is 110 psi. Oddly most of the other sizes, smaller and larger, are 95.

I'm not really after comfort. I'm not a competitive rider but I've been riding on 115 psi just fine for years.
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Old 07-24-21, 05:37 PM
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Originally Posted by 6StringJazzer View Post
Thanks. The specs on the box do say that the pressure for 700x23c is 110 psi. Oddly most of the other sizes, smaller and larger, are 95.

I'm not really after comfort. I'm not a competitive rider but I've been riding on 115 psi just fine for years.
Is that 110 psi recommendation for your weight or just a generic figure for all?
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Old 07-24-21, 06:59 PM
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How much clearance do you have now and what is the inside with of your wheels. The 25mm tires may rubb.

I had a Madone 5.0 and upgraded to carbon wheel with inside width of 19.5mm. The old 14mm inside width rims worked with both 23 and 25mm tires. Even GP4000. Not so with the 19.5mm wheel. Opened the tires up. The 25mm tire rubbed on the chainstay in back and the fork crown up front. Newer bikes tend to have more clearance.
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Old 07-24-21, 08:25 PM
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Generally I recommend going as wide as possible so if your frame has clearance go for a wider tire, You will thank me and the person who sold you the tires. Wider is better up to a point. Certain bikes are for racing or are quite old school and have limited tire clearance (Clarence) but generally 23-25 isn't so bad and will likely fit unless you have a bike designed purely for racing that is older. A lot of Keirin bikes have almost no clearance nor do they need it for track racing where everything must be the same.
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Old 07-24-21, 08:56 PM
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Originally Posted by 6StringJazzer View Post
Thanks. The specs on the box do say that the pressure for 700x23c is 110 psi. Oddly most of the other sizes, smaller and larger, are 95.

I'm not really after comfort. I'm not a competitive rider but I've been riding on 115 psi just fine for years.
Pressure is based on rider+bike weight and tire size. 115psi is ridiculous. Period. If you 'need' that pressure what you really need is bigger tires.
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Old 07-24-21, 09:17 PM
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It will really depend on the bike. My Funny Bike really doesn't like anything wider than 23mm. I suppose I can fit 25mm in, but it will be awfully tight.

I've heard of quite a few bikes from around 2000 to 2010 that did better with 23mm (TT, Tri, etc).

Last edited by CliffordK; 07-25-21 at 02:24 AM.
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Old 07-24-21, 09:19 PM
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Originally Posted by 6StringJazzer View Post
The store only has a 700x25c.
The internet has a store with more sizes than just that one.

While it's true that fatter tires feel more "comfy," for many people, that's not always the case. However, you usually can't go wrong with 25c on a road bike, as long as it's a good quality tire and not el cheapo.
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Old 07-25-21, 02:23 AM
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Originally Posted by 6StringJazzer View Post
Thanks. The specs on the box do say that the pressure for 700x23c is 110 psi.
That spec is somewhere between a guess and wish.

Use this calculator to get the right pressure for any width tire, as measured.

And, wider is more comfortable, because wider means more volume, and can be run at lower pressures which means the carcass can flex a bit more. 25s won't be plush, but they'll be slightly more compliant than 23s.
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Old 07-25-21, 06:13 AM
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Originally Posted by cxwrench View Post
Pressure is based on rider+bike weight and tire size. 115psi is ridiculous. Period. If you 'need' that pressure what you really need is bigger tires.
I don't "need" that pressure. It's the recommended pressure for my tires, which show a max inflation of 160. And what would bigger tires do for me?
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Old 07-25-21, 06:15 AM
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Originally Posted by SurferRosa View Post
The internet has a store with more sizes than just that one.

While it's true that fatter tires feel more "comfy," for many people, that's not always the case. However, you usually can't go wrong with 25c on a road bike, as long as it's a good quality tire and not el cheapo.
Yes, I have found exactly what I want on the Internet if I want to wait a week for delivery. That's an option but I ride about three times a week and would prefer not to wait.
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Old 07-25-21, 06:16 AM
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Originally Posted by 6StringJazzer View Post
Thanks. The specs on the box do say that the pressure for 700x23c is 110 psi. Oddly most of the other sizes, smaller and larger, are 95.
I'm not really after comfort. I'm not a competitive rider but I've been riding on 115 psi just fine for years.
fwiw - past several years, I've been running my fronts approx. 10 psi lower (less diff. w/ the MTB). for example at my last pumping of the road bike I went to 100 rear 90 front. but since they burp when I take the chuck off they are closer to 90/80. these are 25mm tires & I'm approx 225lbs +bike, etc
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Old 07-25-21, 06:21 AM
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Originally Posted by Badger6 View Post
That spec is somewhere between a guess and wish.

Use this calculator [link removed, not allowed for new poster] to get the right pressure for any width tire, as measured.

And, wider is more comfortable, because wider means more volume, and can be run at lower pressures which means the carcass can flex a bit more. 25s won't be plush, but they'll be slightly more compliant than 23s.
Thanks for that. For my setup the calculator says 105 psi (slightly different front and rear).

If the carcass is flexing more, doesn't that increase rolling resistance? Comfort is not really an issue.
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Old 07-25-21, 06:56 AM
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Originally Posted by 6StringJazzer View Post

If the carcass is flexing more, doesn't that increase rolling resistance?
Depends very much on the design of the tire. A tire with supple sidewalls create less rolling resistance than one with stiff sidewalls.
And let’s not forget the influence off the surface you ride on.
If you have infinitely hard tires, then anything you hit, you have to roll up-and-over. And that upwards motion steals some forward movement. A softer tire allows minor irregularities to sink into the tire instead, preserving forward motion better
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Old 07-25-21, 08:30 AM
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Originally Posted by 6StringJazzer View Post
If the carcass is flexing more, doesn't that increase rolling resistance? Comfort is not really an issue.
As the poster above said: it depends. On a quality tire, with at least 120tpi, it may actually reduce the rolling resistance! On a cheap tire with a low thread count, 60tpi or "unpublished," the tire will feel stiff and though you may not feel it, the rolling resistance could be higher....of course, this discussion of higher or lower is relative to what you currently have, which I am guessing is a mid-range 23.

As for comfort, I didn't;t know what I was missing until I tried it. I can remember the rides and the conversation clear as day that I had with a guy on Veterans Day, 2014....the topic of tire width came up, he told me he was on 25s, recommended it, I tried it the following week....today I roll on 27s (summer) or 30s (winter) on my road bikes, and 32s on my "rain bike", and I can assure you the comfort matters. I live in a land of busted roads, and some are still made with cobblestones. Unless you only ride on pristine, new tarmac....comfort matters and will make you faster.
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Old 07-25-21, 09:00 AM
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Originally Posted by 6StringJazzer View Post
I don't "need" that pressure. It's the recommended pressure for my tires, which show a max inflation of 160. And what would bigger tires do for me?
160 is the max pressure the manufacturer found that is 'safe'...more and it may blow off or damage the rim. It has NOTHING to do w/ the pressure you'd actually ride the tire at. Bigger tire=more traction, better rim protection, better comfort and very slightly less rolling resistance.

Originally Posted by rumrunn6 View Post
fwiw - past several years, I've been running my fronts approx. 10 psi lower (less diff. w/ the MTB). for example at my last pumping of the road bike I went to 100 rear 90 front. but since they burp when I take the chuck off they are closer to 90/80. these are 25mm tires & I'm approx 225lbs +bike, etc
No, you're not losing any pressure, that air is only coming from the hose, not your tire.
Originally Posted by 6StringJazzer View Post
Thanks for that. For my setup the calculator says 105 psi (slightly different front and rear).

If the carcass is flexing more, doesn't that increase rolling resistance? Comfort is not really an issue.
No, it doesn't...it actually improves it. As posted before a very hard tire will bounce off every little imperfection in the pavement. By definition that is rolling (or bouncing) resistance. Tires are the only suspension on a road bike, you have to let them do that job to a certain degree. There are no negatives to reducing pressure to a reasonable level. Why would you not want any of those things? How do you know comfort is not an issue if you've never tried it? You don't know til you know. And...why are you so worried about speed as a recreational rider? None of these things make sense. And of course, it's free to try. This has been such a hot topic for the last decade I can't imagine how stubborn you'd have to be to totally ignore it.
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Old 07-25-21, 09:15 AM
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My tires don't have any coarse aggregate to bounce off. They roll better at 125 PSI than they do with 90 PSI. My legs and data collected have told me so.
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Old 07-25-21, 09:29 AM
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Originally Posted by Iride01 View Post
My tires don't have any coarse aggregate to bounce off. They roll better at 125 PSI than they do with 90 PSI. My legs and data collected have told me so.
If that is the most important thing to you...I don't know what to say. I can promise you that you have less traction and lower comfort at 125 than anything lower. And I'm pretty sure not every road you ride on is velodrome smooth...that doesn't happen in our country. No way. It doesn't have to be 'coarse aggregate'.
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Old 07-25-21, 11:32 AM
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Originally Posted by 6StringJazzer View Post
Yes, I have found exactly what I want on the Internet if I want to wait a week for delivery. That's an option but I ride about three times a week and would prefer not to wait.
Ah, only one bike. That's a shame.
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Old 07-25-21, 11:34 AM
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Originally Posted by biker128pedal View Post
How much clearance do you have now and what is the inside with of your wheels. The 25mm tires may rub.
^ This is what you need to do.

You can look up your inflated widths online, bicyclerollingresistance.com, to see if it will fit.

I personally could care less what pressure you like, the only thing that is important is to make sure it will fit in your frame.

John
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Old 07-25-21, 11:44 AM
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Originally Posted by 6StringJazzer View Post
Yes, I have found exactly what I want on the Internet if I want to wait a week for delivery. That's an option but I ride about three times a week and would prefer not to wait.
The trick is to plan ahead on consumables, so you just have to grab the part out of the closet.
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Old 07-25-21, 01:41 PM
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An entire week?!? Oh no...that's a tragedy.
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Old 07-25-21, 01:50 PM
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It’s late but I think 25 is a good idea. And yes you are probably over-inflating your tires by 10-20PSI. It’s ok, most people pump their tires to “max” pressure on sidewall which is understandable.
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