630 wheel size

[Sam Perez]

I am a little confused on what a 630 wheel size is and if the frame hase center pull brakes and is designed around such a size is it convertible to 650 b or 700 or 26?

[Joe Bernard]

630mm is the actual diameter of the rim nominally known as 27", you see it on a lot of '70s 10-speeds and most of those use centerpulls. 622 is what we call 700c and would be the closest size you could try and possibly get the brake pads to reach. 

[Eric Norris]

630mm is the same as 27-inch? See this:

https://www.sheldonbrown.com/harris/rims/630.html

–Eric N

On Nov 17, 2020, at 11:09 PM, Joe Bernard <joer...@gmail.com> wrote:

630mm is the actual diameter of the rim nominally known as 27", you see it on a lot of '70s 10-speeds and most of those use centerpulls. 622 is what we call 700c and would be the closest size you could try and possibly get the brake pads to reach. 

On Tuesday, November 17, 2020 at 7:51:57 PM UTC-8 Sam Perez wrote:

I am a little confused on what a 630 wheel size is and if the frame hase center pull brakes and is designed around such a size is it convertible to 650 b or 700 or 26?

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[Sam Perez]

I see thanks for the quick response everyone

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[Victor Hanson]

Eric yes 27 1/4 was the most popular size think Schwinn Varsity ect.   630mm refers to the bead seat diameter.

Victor

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VIctor R. Hanson

Gen Mgr

Schmier Industrial Properties

o:  510-652-0800

c:  510-207-8593

[Victor Hanson]

Sam, 

Be careful, remember its a 4mm radius when replacing 700c with 27 1/4" (American size from the 10 spd craze in the 70's.)  Going the other way placing 700c wheels on a 27 1/4"  frame is no problem, use a brake with greater reach.  BUT WHY? 

VTW

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[Sam Perez]

Figured more tire options moving to a 700c

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[Jason Fuller]

I would definitely go to 700c/622 myself, both for the tire options and the fact you can fit a little more tire too!  Probably 32mm but at least 28mm tires, and since the overall diameter will be pretty much the same as original, geometry will be preserved.