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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 08-18-08, 09:29 AM   #1
chagzuki
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Wheel standards - please educate me

Could you guys give me a run through of the fundamentals of 20" wheel standards & compatibility? How many axle diameter and lengths are in use? Do most fork dropouts accomodate BMX size axles, or is it only BMX forks that have big enough dropouts? How many hub width standards are in use? And am I right in thinking that the 451 size rim is generally not in use in current folders?
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Old 08-18-08, 11:40 AM   #2
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How many axle diameter and lengths are in use? I think 20" Folders have same hubs as regular bikes (Road,Mountain,BMX).

http://sheldonbrown.com/tire-sizing.html
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Old 08-19-08, 08:07 AM   #3
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Originally Posted by geo8rge View Post
...I think 20" Folders have same hubs as regular bikes (Road,Mountain,BMX)....
Several 20" Dahons use a narrower hub to get a tighter fold. It's around 75-80mm OLD
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Old 08-19-08, 08:18 AM   #4
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Quote:
Originally Posted by chagzuki View Post
Could you guys give me a run through of the fundamentals of 20" wheel standards & compatibility? How many axle diameter and lengths are in use? Do most fork dropouts accomodate BMX size axles, or is it only BMX forks that have big enough dropouts? How many hub width standards are in use? And am I right in thinking that the 451 size rim is generally not in use in current folders?
I don't know what widths are used in BMX. But relative to standard road and mountain bikes, some folders use narrower front hubs (Brompton, tikit, new Birdy, Dahon) as well as narrower rear hubs (Brompton, Downtube Mini SA8) that correspond to the internal hubs that come with the bikes. You will have to check each model to verify. However, such information is typically available on the web.

In regards to 20" wheels, yes, the typical ERTO size is 406 instead of 451. But again, there are some ERTO 451 20" bikes out there.
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