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Measuring 27 Inch Wheel Width?

Old 09-20-14, 09:20 AM
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pgtr
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Measuring 27 Inch Wheel Width?

Hello,

27 inch wheels are listed in a number of widths, 1, 1-1/4, etc. How are those widths measured? Inside rim? Outside rim?

thanks,
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Old 09-20-14, 09:44 AM
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The tires are 1 1/4.

You can use 27x1, 27x1 1/8, 27x 1 1/4 and 27x1 7/8.

I don't know of rims for 27" wheels that are narrower.
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Old 09-20-14, 10:31 AM
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Let me rephrase - In order to establish the nominal width of a 27" wheel which does not have it's dimensions stamped on it somewhere - do you measure the inside width of the rim or the outside width of a rim?

Thanks,
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Old 09-20-14, 10:46 AM
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Rim widths are measured inside the bead to determine what size tire can be used. Here is a chart that has some guidance on compatibility: Tire Sizing Systems

Some rims have markings like "27x1 1/4" but if you measure them, they can vary a lot, and are not 1 1/4" wide. I have a pair of Weinmann concave rims that are marked 27x1 1/4 but are only 5/8" wide. I think the marking is for the recommended tire size.
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Old 09-20-14, 10:50 AM
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Normally, it's the rim's inner width between the rim lips that's used.



Tire Sizing Systems: sheldonbrown.com

The bead seat diameter of 27" rims is always 630mm regardless of the tire width. There are ranges of "safe" rim widths for different width tires, so if you scroll down the page linked above you'll see a matrix of safe rim widths for different width tires (green = safe, red = unsafe).

EDIT - Pompiere beat me to it.
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Old 09-20-14, 01:10 PM
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Originally Posted by Pompiere View Post
Some rims have markings like "27x1 1/4" but if you measure them, they can vary a lot, and are not 1 1/4" wide. I have a pair of Weinmann concave rims that are marked 27x1 1/4 but are only 5/8" wide. I think the marking is for the recommended tire size.
Thanks for the links everyone - I had seen some of those links previously but above is what I've been confused by. I see 27 inch wheels and on the rims they are sometimes stamped "27 x 1-1/4" or "27 x 1" or "27 x 1-1/8" or sometimes they are just generically described as or measure out to be "27 inch" wheels. So what's the difference between those 27 inch wheels marked as such? And should I care?

thanks again
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Old 09-20-14, 01:50 PM
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Originally Posted by pgtr View Post
Thanks for the links everyone - I had seen some of those links previously but above is what I've been confused by. I see 27 inch wheels and on the rims they are sometimes stamped "27 x 1-1/4" or "27 x 1" or "27 x 1-1/8" or sometimes they are just generically described as or measure out to be "27 inch" wheels. So what's the difference between those 27 inch wheels marked as such? And should I care?

thanks again
27 x 1, 27 x 1-1/8, and 27 x 1-1/4 are tire sizes, not rim sizes.

It's possible a rim marked 27 x 1-1/4 has an inner rim width optimized for 1-1/4" wide tires as Pompiere says.
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Old 09-20-14, 02:14 PM
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Specialized tires, particularly the Armadillo/Turbo series, seem to run true to callout size, such that the 700Cx28s I have owned really are 28mm wide at their widest point. In contrast, everything else I have bought runs about 10% small.

700Cx28 Contis are consistently 25, sometimes 26, mm wide and can therefore fit in my Bianchi, which Specialized 28s cannot without rubbing.
Likewise, 700Cx28 Vittorias run about the same size as the Contis.

I use the actual width, as measured with a caliper, rather than the callout number stamped on the tire when assessing the suitability of a given tire for a particular rim's inner wall-to-wall width.
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