Rims and tires with ISO 630mm bead seat diameter. The former standard road bike rim and tire size, particularly in the US bike boom of the 1970's.

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19
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Am I too heavy for my road bike tires?

I am wondering if bike tires have a weight limit. I have to admit, I am a large guy at 6'3" 250lb (190 cm, 113,5 kg), and I have always had issues with my road bike's tires getting pinch flats. I ...
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2answers
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How do I know if I can replace the 27 inch wheels with 700c wheels on my bike?

I recently purchased an 80's Japanese bike off craigslist called "Jupiter King." It has 27 inch tires but I want to switch to 700c for greater wheel/tire selection. I specifically want some nice ...