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I have a 20" road frame (it's very cute) that I want to build up. As one can imagine, 20" road rims are not that easy to find. I found some rims that might work, but how can I tell if I need 406mm or 451mm rims (they are both listed as 20")?
 

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It's about the tire, not about the rim

Go to Sheldon Brown's web site and go to the tire size discussion. I can't remember which, but one of those rims is for performance tires (what you want) and the other is for kids' bikes.
 

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Kerry Irons said:
Go to Sheldon Brown's web site and go to the tire size discussion. I can't remember which, but one of those rims is for performance tires (what you want) and the other is for kids' bikes.
Don't forget recumbents! They use both 406 and 451 with 406 being the more commonly available wheel/tire combo. Keep this in mind when you go to shop for wheels and tires, look to the recumbent specific dealers for better selection, price and stock. Two good sources for 20" wheels and tires are www.hostelshoppe.com and www.poweroncycling.com.

John
 
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