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Folding Bikes Discuss the unique features and issues of folding bikes. Also a great place to learn what folding bike will work best for your needs.

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Old 03-15-14, 12:12 AM   #1
gate28
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20 x 1 3/8th?

Can anyone tell me how this size wheel eventuated? Was is a product of the engineering process? Of steel export duties? And why when the Raleigh 20 frame went to USA, did they equip with a 20inch wheel?

My reasons for asking are that the feel of that wheel under a 6' 3" 90KG man is light and responsive.

The BMX for the middle ages?

It's such a natural size - is it like the Golden Section for Clasical architects?
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Old 03-15-14, 01:30 AM   #2
jur
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I am speculating that the US R20 was equipped with tyres that were commercially available in the US at the time.

Tyre sizes are pretty chaotic. See sheldonbrown.com/tire-sizing.html
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Old 03-15-14, 02:06 AM   #3
gate28
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No. I am talking about a natural (see Gravity) size wheel. I ask you, why don't cars have 26inch, 29 inch wheels? The Fiat Uno has a wheel the same size as the R20 Folder!

Racing cars, Formula 1, they have 20 x 1 3/8ths wheels.
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Old 03-15-14, 09:28 AM   #4
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Projecting a Guess >>> There were a lot of 3 speed bikes EA3 26" is that wide,
smaller Brompton wheels are that wide, so why not thought the genii at Raleigh, a 20" too
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