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Which tire to these wheels ?

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Which tire to these wheels ?

Old 06-07-15, 02:07 AM
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Which tire to these wheels ?

I'm confused about the terms of tire sizing during my hunt after the right tires for my new wheels (Campagnolo Khamsin) with these specs:



Which numbers should I pay attention to on the tires?
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Old 06-07-15, 02:30 AM
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The wheel is for a 700c tire, if you want comfort, and your frame can take it, a 28mm, if you want comfort & speed, 24/25/26mm (most frames should take upto 25mm with no issues), if you want speed 23mm, if you don't want comfort / like to look retro, go 19mm or less.
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Old 06-07-15, 03:43 AM
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The critical number is 622 (mm) which refers to the diameter of the rim it fits. 18.5 (mm) is the tire's approximate width, and here you have some latitude but ate limited by frame and fork clearance. 18.5 is extremely narrow, so feel free to go wider if possible.

28" is the obsolete nominal size in inches and was the approximate diameter of the complete wheel including the tire.
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Old 06-07-15, 09:58 AM
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they decided to put two notations, separated by a '/' on the tire, the first one is metric system based and is most useful. the other is Imperial (as in 'imperious') System based and is just about useless, unless you are designing a frame or trying to calculate gear-inches (you don't want to know ).

sometimes a Rosetta Stone is necessary to fully understand tire sizing.

Last edited by hueyhoolihan; 06-07-15 at 10:07 AM.
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Old 06-07-15, 10:18 AM
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Post #12

Originally Posted by hueyhoolihan View Post
they decided to put two notations, separated by a '/' on the tire, the first one is metric system based and is most useful. the other is Imperial (as in 'imperious') System based and is just about useless, unless you are designing a frame or trying to calculate gear-inches (you don't want to know ).

sometimes a Rosetta Stone is necessary to fully understand tire sizing.
I am pleased to hear this (not only me are confused). What is the 18.5 ?
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Old 06-07-15, 10:37 AM
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Originally Posted by jimc101 View Post
The wheel is for a 700c tire, if you want comfort, and your frame can take it, a 28mm, if you want comfort & speed, 24/25/26mm (most frames should take upto 25mm with no issues), if you want speed 23mm, if you don't want comfort / like to look retro, go 19mm or less.
TBH though...you will not be able to measure any speed difference between a 28mm slick and a 23mm slick. And the 28mm will be far more comfortable, although as you state frame clearance is a bugger...since all frame companies seem to believe riders are all sub-70KG.

Originally Posted by Winblows View Post
I am pleased to hear this (not only me are confused). What is the 18.5 ?
18.5mm is the rim width. Which as rims goes is quite narrow. Although all Campy rims still live in the stone age of narrow rims, I don't think they make any rims larger than 20.5 mm yet (externally measured, brake track to brake track).

Last edited by Marcus_Ti; 06-07-15 at 10:44 AM.
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Old 06-07-15, 10:44 AM
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Originally Posted by Winblows View Post
I am pleased to hear this (not only me are confused). What is the 18.5 ?
Probably the outside width of the rim - take your calipers and measure it to be sure. Or possibly the inside width of the rim.
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Old 06-07-15, 12:01 PM
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Post #13

Originally Posted by Marcus_Ti View Post
TBH though...you will not be able to measure any speed difference between a 28mm slick and a 23mm slick. And the 28mm will be far more comfortable, although as you state frame clearance is a bugger...since all frame companies seem to believe riders are all sub-70KG.



18.5mm is the rim width. Which as rims goes is quite narrow. Although all Campy rims still live in the stone age of narrow rims, I don't think they make any rims larger than 20.5 mm yet (externally measured, brake track to brake track).
rim width: 21mm outside
rim width: 15mm inside

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Old 06-07-15, 12:12 PM
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Originally Posted by Winblows View Post
rim width: 21mm outside
rim width: 15mm inside

15mm measured what-to-what? I presume that is the inside-bead-to-inside-bead measurement, I have a pair of 2006 Zondas that have a 15mm internal bead measurement. Where'd you get the pic in the OP from? I've never seen a graphic like that, then again I've never gone hunting for one.

Did some looking, 20.5mm is the official nominal brake-track width for basically all their 2015 wheels.
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Old 06-07-15, 03:46 PM
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Originally Posted by nfmisso View Post
Probably the outside width of the rim - take your calipers and measure it to be sure. Or possibly the inside width of the rim.
I have never seen a tire so proudly marked with a "width" that was intended to be a rim width. Why would this be assumed to be a rim width when marked on a tire? Andy.
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Old 06-07-15, 04:54 PM
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it's marked with a 18.5 and has an x 622 too.

the rim must match the tire, so the markings could be referring to the tire's dimensions or a rim that the tire fits. i'd put my money on the inflated tire's dimensions. although incredibly narrow for a modern tire designed for anything but a track sprinter.

in any case, it's unlikely that the 18.5 and the 622 refer to two different objects though.

like i said previously, you need a Rosetta Stone, maybe a crystal ball too.

Last edited by hueyhoolihan; 06-07-15 at 08:14 PM.
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Old 06-07-15, 07:24 PM
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Post #14

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Old 06-07-15, 07:26 PM
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700c x 23 should work nicely
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Old 06-07-15, 08:01 PM
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I am running 700c x 27mm Challenge Parigi-Roubaix tires on that rim with no problems. The tires actually measure 29mm on the rim.

(FYI, 622mm, 700c, 28" and 29er are all the same diameter rim. Obnoxious, I know. Personally I don't know why we can't just use the metric designation in general.)
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Old 06-07-15, 08:34 PM
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Post #15

Thanks to all of you, especially Mr. lostarchitect.
I finally feel well suited for ordering some tires
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Old 06-17-15, 11:41 AM
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Post #17

The final choice: 700x23c





Thanks for help !
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Old 06-17-15, 12:13 PM
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Originally Posted by Andrew R Stewart View Post
I have never seen a tire so proudly marked with a "width" that was intended to be a rim width. Why would this be assumed to be a rim width when marked on a tire? Andy.
It's not a tire in the pic, it's a rim strip.
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Old 06-17-15, 08:43 PM
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Nice tire, with the reflective stripe.

I have the Bontrager H2's (28mm) with reflective stripe on my road bike. Pricey but nice.
Put Continental Touring with reflective stripes on my Specialized Sirrus (32mm)
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Old 06-18-15, 04:49 AM
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Originally Posted by hueyhoolihan View Post
... incredibly narrow for a modern tire designed for anything but a track sprinter.
It's not a tire in the pic, it's a rim strip.
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Old 06-18-15, 07:34 AM
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Originally Posted by dabac View Post
It's not a tire in the pic, it's a rim strip.
Which would explain why I've never seen a tire with a rim width on it Andy.
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Old 06-18-15, 07:44 AM
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Originally Posted by Andrew R Stewart View Post
Which would explain why I've never seen a tire with a rim width on it Andy.
Maybe a feature to benefit tightrope riders, letting them know which maximum gauge of wire a certain wheel is good for....
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Old 05-23-19, 04:15 PM
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I wonder if a Schwalbe Marathon Plus (700X28C) tire would fit my Benotto "Paris Special" frame on this wheel ?
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Old 05-23-19, 04:19 PM
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Ignore and delete this post, I’m illiterate.
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Old 06-09-19, 08:12 AM
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the Schwalbe Marathon Plus (700X28C) tire fits perfectly, even though it has cost a lot of elbow grease to put it in place ...
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