I found an old raliegh folder behind a body shop and as it is complete I decided to restore it. The tires were rotted off and I could not read the size so I measured across the rim. It was 18 inches. I assumed it would take a 20 inch tire. I bought a 20 inch BMX type tire and it doesn't fit. it is too small it seems. Is there an odd sized tire for these? The old tires measure about 21inches across but they may be stretched from age.
Any help would be appreciated