Why 27" / 630 mm wheels?
#27
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597mm was the standard size for British club bikes until around 1950. I figured you'd have known that, NormanF, with your love for Path/Club bikes.
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Of course but today are practically obsolete. My last path bike had 635 mm wheels, the last size any one is still making tires to fit them. That would be Schwalbe.
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SCHWALBE HS130 26 x 1 1/4 (32/597) :: £12.00 :: PARTS & ACCESSORIES :: Tyres - General :: Spa Cycles, Harrogate - The touring cyclists specialist.
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Dont forget 507mm for 24" kid MTB's, 571mm for 650c (26" narrow road tires) both are fairly common. There are also a couple of other 20" wheel sizes that all use different rims. I
nterestingly, the outer diameter of the tire for both 507mm and 571mm are very close. I converted a 24" mtb frame into a road bike for my daughter by switching it to 650c wheels and fork and drilling the frame bridge for a road brake on the rear tire.
nterestingly, the outer diameter of the tire for both 507mm and 571mm are very close. I converted a 24" mtb frame into a road bike for my daughter by switching it to 650c wheels and fork and drilling the frame bridge for a road brake on the rear tire.
#34
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More to the point; why isn't everyone using ETRTO designations? In automobiles, trucks, motor vehicles - just about everywhere else, tires are designated by the bead seat diameter (BSD). It would a great deal less confusing for everyone if bicycling followed the same standard.
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Back in the early '70s, 26" wheels were used on Western Auto and cheap department store bikes and 27" wheels were used on more expensive bikes.
#36
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And have you ever noticed how bad most 24"-wheeled kids bikes are? I'd try to keep a kid on a 20" bike as long as possible until she's ready for 26".
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More to the point; why isn't everyone using ETRTO designations? In automobiles, trucks, motor vehicles - just about everywhere else, tires are designated by the bead seat diameter (BSD). It would a great deal less confusing for everyone if bicycling followed the same standard.
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#39
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Do you mean "it was already the dominant wheel size in the rest of the world" or "it's only dominant in the US"?
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#40
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Don't forget size of the rider. It gets complicated, doesn't it. Suppose we decide that people over 6'2" (188 cm) tall really need to be riding 30" wheels. Should we make a new standard for them? Should adults buy bikes sized not just in frame sizes but wheel sizes? I hope not. It's bad enough that there are 12", 16", 20", and 24" wheels for kids.
And have you ever noticed how bad most 24"-wheeled kids bikes are? I'd try to keep a kid on a 20" bike as long as possible until she's ready for 26".
And have you ever noticed how bad most 24"-wheeled kids bikes are? I'd try to keep a kid on a 20" bike as long as possible until she's ready for 26".
Last edited by 1987; 07-12-14 at 09:23 AM.
#41
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More to the point; why isn't everyone using ETRTO designations? In automobiles, trucks, motor vehicles - just about everywhere else, tires are designated by the bead seat diameter (BSD). It would a great deal less confusing for everyone if bicycling followed the same standard.
The auto companies, wanting to have simple procurement processes that actually work, have usually set policies that where there isn't a good reason not to, SAE standards ("J-documents") must be used. The credibility of SAE also gives the company lawyers something to anchor their claws onto ("We followed industry good practices," et cetera) as they survey the incoming threats.
Other than in the USA there are national and continental standards bodies that serve the same purposes and sometimes agree with SAE. Because the industry is so huge, any released (accepted, agreed, recognized) standards really have a lot of effect. In some cases national safety standards enforced by say, the National Highway Traffic Safety Administration (which have legal strength), have followed SAE standards and research. In a few cases ISO has developed international standards on topics that SAE has addressed and vice versa. But the ISO standards are usually recognized for their technical authority and generality, but are not usually made into regulations in the USA. SAE makes an attempt to be consistent with ISO.
Anyway, no such adherince to standards is true in the bike industry. ISO and some national standards exist, but for the most part cottage builders (like the thousands of custom and bespoke frame builders) are free to have their own ideas and to sell what they think works. It's a much more free market in the wild bike world. But "let the buyer beware" is still an important point, as a result.
Last edited by Road Fan; 07-14-14 at 04:44 PM. Reason: improve clarity
#42
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Another interesting point: tubulars (sometimes called "sprints" in the UK) can be found marked "27 inch." But they still fit what is known in the USA as a 700c tubular rim. And the 700c tubular rim is called that because its brake track is in the same position as the brake track of a 700c clincher rim. Therefore a set of tubular rims (your race wheels) could be readily interchanged with a set of 700c clincher wheels (your training wheels).
#43
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But it might be a fun on-line toy for bikie nerds!
#44
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I have no doubt that a creative engineer can come up with an optimization process and program it, but the range of factors must be weighted. Do you prefer traction, cushiness, speed, efficiency, flat resistance, or what? I think the "optimized" result would be different for different rider preferences.
But it might be a fun on-line toy for bikie nerds!
But it might be a fun on-line toy for bikie nerds!
#45
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The Michelin TRX - it was still measured by bead seat diameter. The TRX required a different shape of rim, which is why Michelin choose to introduce different rim sizes so that it was impossible to install a TRX tire on a regular rim.
#46
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Old article but an interesting perspective by a manufacturer president:
700c vs. 26"
Outdated but sort of gives an insight how riders and manufactures think and steer the market.
As for myself, scary thought of having bikes with just about every assortment of tire size and type. Old, new, road, knob's, tubulars, clinchers and even tubular/clinchers, 20, 24, 26, 27, 28, 700c. And then there's the LBS asking about my 'exclusive Schwinn' size and not by dimension...LOL.
700c vs. 26"
Outdated but sort of gives an insight how riders and manufactures think and steer the market.
As for myself, scary thought of having bikes with just about every assortment of tire size and type. Old, new, road, knob's, tubulars, clinchers and even tubular/clinchers, 20, 24, 26, 27, 28, 700c. And then there's the LBS asking about my 'exclusive Schwinn' size and not by dimension...LOL.
#47
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And lets us not forget the Venerable ISO
[h=3]26 x 1 3/8 inch (590 mm) [/h]
[h=3]26 x 1 3/8 inch (590 mm) [/h]
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#48
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Fat bikes use standard 559mm (26" mtb tire size) rims that are really wide (65-100mm width) combined with a huge tire to achieve tire outside diameter that is very close to a 29'er mtb tire. While they are cushy, fat tires/wheels are really heavy, feel slow on the road and they have some weird self-steering characteristics when used on hard surfaces.
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