confusing tire sizes

rc mad

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May 13, 2006
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scunthorpe, north lincs
Just a bit confused with the tire sizes on my old sp370, got the wheels rebuilt myself

IMG_1714.jpg


powdercoated black with stainless spokes :clap Not bad considering what they started out as

IMG_1568.jpg


Anyway, they are going to be trued up tomorrow so i thought i'd look into getting a set of tires for the bike, the sizing are strange (to me) tho

front is 3.00-21 51R and the rear is 4.00-18 64R, can anyone decipher this into usefull info ie 100/90-19, ta muchly :thumb2
 


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