Anyone running 27” tubulars?
07-24-18, 05:45 PM
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07-24-18, 05:48 PM
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Wow!!! I wish I was in Portland. In this case, 27" is 700C.
07-24-18, 06:09 PM
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07-24-18, 09:12 PM
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There was just an extended conversation on this topic in the Classic Rendezvous Group.
Before the ETRTO (European Tire and Rim Technical Organization) Standards were adopted by most European tire and rim manufactures, just about every country had their own standards.
700c like 650b and many other letter sizes were originally French tire size standards. The ETRTO standards measure the diameter of the bead seat in the rims rather than tire sizes: 622 = 700c tires, 630 = 27" tires.
While there were smaller wheel size tubular tires made for specific uses (600mm, 500mm, 400mm, 26", 24", 22", 20" etc.) the standard size over the past 70+ years have been 700c sized.
Before ETRTO, Continental tires used the German standard call out: Sewups were marked 27" not 700c. Here's a Continental cyclocross sewup I bought in the late 70's. It's marked 27 x 1 1/8 (it still holds air)
So yes, most tubular tires are the equivalent to 700c sized.
Clear as mud eh?
And for the newbie MTBrs, they are 700c NOT 29ers!
verktyg
Before the ETRTO (European Tire and Rim Technical Organization) Standards were adopted by most European tire and rim manufactures, just about every country had their own standards.
700c like 650b and many other letter sizes were originally French tire size standards. The ETRTO standards measure the diameter of the bead seat in the rims rather than tire sizes: 622 = 700c tires, 630 = 27" tires.
While there were smaller wheel size tubular tires made for specific uses (600mm, 500mm, 400mm, 26", 24", 22", 20" etc.) the standard size over the past 70+ years have been 700c sized.
Before ETRTO, Continental tires used the German standard call out: Sewups were marked 27" not 700c. Here's a Continental cyclocross sewup I bought in the late 70's. It's marked 27 x 1 1/8 (it still holds air)
So yes, most tubular tires are the equivalent to 700c sized.
Clear as mud eh?
And for the newbie MTBrs, they are 700c NOT 29ers!
verktyg
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07-25-18, 05:25 AM
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During the early 1970s bicycle boom, many tubular brands were labelled as 27". Based on being the equivalent of 622mm BSD equivalent, they were technically a 28" tyre. However, the average consumer could not rationalize how a 28" tyre could be a smaller diameter than a 27" tyre, which was popular on "10 speeds" of the era. To the average consumer, they were closest to 27" and often you could even switch wheels with a minor brake pad adjustment. They were also the two sizes most commonly used on "10 speeds". So, in order not to confuse the consumer, many manufacturers labelled tubulars as 27", as that was the closest common imperial size, based on actual outer diameter.
07-25-18, 06:05 AM
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Yes, I think much of the labeling confusion arose because of the existence of metric and English measurement systems, the wide variation in tire heights, and the need to specify brake pad height (rim radius or diameter) and mudguard / stay / fork clearance (tire outer radius or diameter). I have never seen a bicycle tubular tire that did not sit on a 622mm diameter rim.
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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
07-25-18, 09:04 AM
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As pointed out by verktyg, there were several other sizes of tubular tyres, When I was racing in the early 1970s there was a Pee-Wee class racer (10-11 years old) with a custom built Reynolds 531 DB frame with full Campagnolo (Nuovo) Record group (yes, even the brakes) and 24" tubulars. His bicycle was the envy of a lot of riders.
07-25-18, 02:04 PM
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As pointed out by verktyg, there were several other sizes of tubular tyres, When I was racing in the early 1970s there was a Pee-Wee class racer (10-11 years old) with a custom built Reynolds 531 DB frame with full Campagnolo (Nuovo) Record group (yes, even the brakes) and 24" tubulars. His bicycle was the envy of a lot of riders.
Vittoria still makes them in four sub-700c diameters.
https://www.vittoria.com/us/juniores-training.html
JUNIORES
Training and racing tubular for juniors, identical casing to Rally but fitting smaller wheels: 20, 22, 24, and 26 inches. Vittoria quality, feel and performance, at an entry-level price point!
07-25-18, 05:42 PM
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650c sized tubulars are not rare, that was the triathlon standard for while, with a 571mm rim diameter and often referred to as 26x1".
