Clincher tyre width - which brands/models fit as sized?

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JBC2
Posts: 16
Joined: Sat Jan 13, 2018 4:51 pm

by JBC2

Can anyone advise on which tyres actually measure the width they are sold as?

As per my other thread new 17mm rims mean I have to buy 25mm tyres and when I use 25 mm tyres on the 17mm the tyres need to measure 25mm +/- 0.2 mm.

They can't end up as 28mm....!

So which brands and models are the most reliable as actually measuring their stated size when installed.

Many thanks

by Weenie


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stormur
Posts: 1173
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Location: FIN

by stormur

Veloflex Corsa 25 will have 25
Pirelli 23mm will have 25.6mm on 17.5 rim.
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I can be wrong, and have plenty of examples for that ;)

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TonyM
Posts: 3376
Joined: Thu Jan 22, 2015 4:11 pm

by TonyM

Vittoria Open Corsa 25mm on 17C: 27mm with 95 psi, 26mm with 75 psi

JBC2
Posts: 16
Joined: Sat Jan 13, 2018 4:51 pm

by JBC2

Found this to be a useful place to find more detailed info, what a minefield!
On a 17C rim, at an air pressure of 100 psi, all versions of the GP4000S II are a bit wider than specified. With the 23C being 25 mm wide, 25C 27 mm wide and the 28C a whopping 31 mm wide.
https://www.bicyclerollingresistance.co ... i-23-25-28

alcatraz
Posts: 4064
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

It's possible (I think) that every manufacturer has a similar way of measuring their tires.

Most tires of the same brand should measure similarly. Check some real measurements of different brands (like in the tables at bicyclerollingresistance.com) and you'll probably be able to guess what you will end up with. Check a tire that you've previously owned with the table as a reference.

17c is quite standard I think. It should be very close to what is written on the tire.

With my light weight and wide inner width rims (404copies) I could never go wider than 23 specified. They are at least 25mm mounted. Good for me.

/a

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fa63
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Location: Atlanta, GA, US

by fa63

I have found the Specialized Turbo to be pretty true to size; 24 mm measures ~25 mm (and also quite short) on HED Belgium+ rims.

Hexsense
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Location: USA

by Hexsense

fa63 wrote:
Thu Feb 01, 2018 4:09 am
I have found the Specialized Turbo to be pretty true to size; 24 mm measures ~25 mm (and also quite short) on HED Belgium+ rims.
Yes they are small compare to Continental/Vittoria/Pirelli.
my 26c Turbo almost reach 28mm on 21mm internal width. While Continental,Pirelli and Vittoria 25c are around 28.7-29.5mm .
It almost feel unfair when some website test 24c specialized (which is narrower than 23c on many brand) against 25c of others.

JBC2 wrote:
Wed Jan 31, 2018 9:58 pm
As per my other thread new 17mm rims mean I have to buy 25mm tyres and when I use 25 mm tyres on the 17mm the tyres need to measure 25mm +/- 0.2 mm.
Get over the old outdated guideline of 17mm internal width can't use 23c already!
Why don't you use 23c on 17-18mm rim? That would be closer to 25mm than trying to find 25c that run small.
PS. Continental 23c on my 21mm internal width rim is 27.3mm wide so it's clear that even some 23c will be wider than 25mm on wide rim.

JBC2
Posts: 16
Joined: Sat Jan 13, 2018 4:51 pm

by JBC2

[/quote]
Get over the old outdated guideline of 17mm internal width can't use 23c already![/quote]

The concern is safety. If a major wheel manufacturer says use 25mm for safety reasons and its your kids safety at risk I am tended to follow what is prescribed.

Hexsense
Posts: 3270
Joined: Wed Dec 30, 2015 12:41 am
Location: USA

by Hexsense

When you find a 25c that run smaller than other brands 23c you do realize it is essentially a smaller tire regardless of what it label, right?
:roll:
I should open a company, buy continental 23c and relabel as 25c (that run more true to size) with mark up price of 100% to market people who must use tire labeled as 25c but it can not be wider than what 23c supposed to be (on wide rim).

by Weenie


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