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Gear Question

I need to buy replacement tires for an...

I need to buy replacement tires for an old, old road bike with 27 x 1 1/4 tires. I have crawled google to convert that to an equivalent 32-630 ISO, but an mystified by the size system realcyclist is using (I cannot find any explantion of it). Can anyone help me convert to the tire size I need to find? Thank you!

Responded on

A 32-630 is 32mm wide tire for a 630mm diameter wheel. Almost all road tires on Real Cyclist are 700x## which are 700mm tires in ## width. These will not work for your old ten or twleve speed.

Sheldon Brown is always where I go for a vintage job like this.