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Sheldon Brown wrong on tire widths? Can't be

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Sheldon Brown wrong on tire widths? Can't be

Old 03-07-16, 11:09 AM
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Inpd
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Sheldon Brown wrong on tire widths? Can't be

So I know that Sheldon Brown's webpages are an amazing resources. I was browsing through this one on tire widths:

Tire Sizing Systems

which says that for 23mm rims the minimum tire diameter is 40mm

However, there are all these posts like this one 23mm rims, 23 or 25mm tyres? - BikeRadar Forum talking about 23mm rims taking 25mm tires.

So I'm completely confused? Are they measuring different diameters (i.e. interior vs exterior) or is it something else.
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Old 03-07-16, 11:44 AM
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Originally Posted by Inpd View Post
However, there are all these posts like this one 23mm rims, 23 or 25mm tyres? - BikeRadar Forum talking about 23mm rims taking 25mm tires.

So I'm completely confused? Are they measuring different diameters (i.e. interior vs exterior) or is it something else.
Yes, the Sheldon chart is interior width, and most people talk about 23mm external width (at the brake track). So a Pacenti SL23 is actually 24.5mm external, 20.3mm internal.

Alloy Rim Roundup - Fairwheel Bikes Blog

The chart I believe is the official ERTO recommendations, so you'll notice a disclaimer below it:
"Note: This chart may err a bit on the side of caution. Many cyclists exceed the recommended widths with no problem."

Going with a wider rim that recommended is usually alright, going with a wider tire tends to lead to squirmy feel, since the tire is more unstable on the rim.
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Old 03-07-16, 12:05 PM
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"Sheldon Brown wrong on tire widths?"

Watch it buddy, you're close to becoming the first person both banned and tar & feathered from this forum.
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Old 03-07-16, 12:12 PM
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Originally Posted by BillyD View Post
"Sheldon Brown wrong on tire widths?"

Watch it buddy, you're close to becoming the first person both banned and tar & feathered from this forum.
In my defense, please note it was a question!
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Old 03-07-16, 12:13 PM
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Originally Posted by gsa103 View Post
Yes, the Sheldon chart is interior width, and most people talk about 23mm external width (at the brake track). So a Pacenti SL23 is actually 24.5mm external, 20.3mm internal.

Alloy Rim Roundup - Fairwheel Bikes Blog

The chart I believe is the official ERTO recommendations, so you'll notice a disclaimer below it:
"Note: This chart may err a bit on the side of caution. Many cyclists exceed the recommended widths with no problem."

Going with a wider rim that recommended is usually alright, going with a wider tire tends to lead to squirmy feel, since the tire is more unstable on the rim.
Bingo.


And quite honestly....when in the last 10+ years has anyone cared what the ETRTO has said about anything?
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