In order to get the correct answer you must ask the right question, there are TWO different sizes of 20" wheels: 405 & 451
Now, why there are TWO wheels named 20" is a bit of a mystery but the answer begins with the fact that the metric system is superior.
BTW the answer is: 451
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BMC Race Machine / BMC Team Machine / Rossin Record / 80's Pinarello Traviso / Merlin MTB / Raleigh "Folding 20" / Ti-Swift (!)
Erikson w/C&C couplers / Trek's: 2300, 1200, 990 / Jamis 'Sputnik'
Last edited by kraftwerk; 03-08-19 at 11:15 AM.