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Tire sizing explained *PIC*

Ran into an issue the other day trying to fit a new rear tire to a W650 Kawasaki.
The only tire maker I could find that still made the OEM size (130/80-18) was IRC.
If the owner wanted to upgrade he'd have fit an alternative, so I suggested a 120/90-18.
It made me do some hunting, here's a chart giving an explanation to some of the more archaic nomenclatures -

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Tire sizing explained *PIC*
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