1 1/4 rim = 1 1/8 rim?
12-21-07, 05:26 PM
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1 1/4 rim = 1 1/8 rim?
A thread below reminded me of a question I've been wondering about: I have two sets of 27" wheels with Araya alloy rims. One set is inscribed "27 X 1-1/4" and the other says "27 X 1-1/8." But I measured them a few weeks ago with a micrometer, and found that they actually seem to be identical in size. I did not remove the tires, so I didn't measure the interior rim width, but they were the same to the tenth of a millimeter on the outside. Does anyone here know why the inscribed markings state different sizes?
12-21-07, 05:42 PM
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They are the same size. I replaced a front rim last summer and although they are marked different they indeed are the same size.
I measured the inside and outside dimensions. No difference.
I measured the inside and outside dimensions. No difference.
12-22-07, 07:12 AM
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The inscribed making indicates the recommended tire size.
12-22-07, 08:53 AM
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So-called 27" rims are almost invariably 630mm in outer flange diameter, to accommodate tires of 27" outer diameter, 1-1/4" sidewall height, and variable width. One's sole concern is to match flange-to-flange rim width to tire width (see SheldonBrown.com for a good, though arguably overly safe and conservative, discussion), and to avoid using straight-walled rims at higher tire pressures.
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Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
12-22-07, 12:37 PM
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Not exactly apples to apples, but I have a couple 559 rims. One is marked 26x1.50 and the other is 26x1.75. The latter is actually a hair "skinnier".
12-22-07, 01:25 PM
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Interesting thread. It caught my interest because I have one set of UKAI, 1 1/8 rims and several other brands at 1 1/4. The UKAI are at least 1.4 mm narrower than any of my Araya or Weinmann 1 1/4 rims (I checked 6).
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12-22-07, 04:22 PM
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12-23-07, 06:51 AM
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I have a set of Araya rims and a set of Wienmann rims that are both marked 27x1 1/4". The Arayas are about 19mm wide, and the Wienmanns are 15mm. I have another set of Arayas with no size markings that are about 17mm.
