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What size is my wheel?

Asked by Timebomb (240points) December 16th, 2009

So I measured the radius and it was 30 cm so I assumed pi x 60 would give me the right size, but I don’t think inner tube sizes work like that.
http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_168484_langId_-1_categoryId_228353

Here’s a inner tube and it says 28”, does 28” represent the diameter?

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