Wilkinson's is quite useful in a town with no bike shop, except out of town Halfords, but I've always been puzzled by the selection of tyre sizes. Here is what was available in their Barking branch today. I'm only quoting ISO sizes, formerly known as ETRTO sizes. Although unfamiliar to any, they are the only ones that are reliable. The British, European and US sizes can seem similar whilst being very different.This guide converts between the different standards.
ISO uses width in mm, dash, bead circumference in mm. Obviously the latter is critical. The former doesn't make that much difference, especially with a few mm of course
Wilkinson's had 47-406, 47-507, 47-559, 37-622 and 32-630 sizes. I believe the most popular size in the world is 37-590, which British (Empire) people know as 26 x 1 3/8. 37-622 is a common size amongs my LCC friends.
I once encoutered someone who had his Brompton folding bike stolen shortly after he bought some new tyres for it. Brompton tyres are 37-349 typically, commonly called 16 x 1 3/8. Unfortunately he had bought 16" USA sized tyres, of a mere 305mm diameter (probably 47-305), almost an inch and three quarters too small in diameter.
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