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Ok so i am rebuilding a benelli 350 single. long story short rear tire is a Pirelli MT-53 3.00-17. Seems to me modern tires have a different sizing code these days. How can i convert this size tire to modern terms. and additionally i am goin for a more aggressive somewhat brat look...can anyone recomend a suitable sized tire.
Tire sizing codes are different these days because older inch-based tire sizes do not have the aspect ratio as part of the tire size while modern tires do. That is because older inch-based tires all have a 100% aspect ratio, meaning they are the same wide as tall. With advancements in tires came changes in the aspect ratio. You can convert your inch-based size by first converting inches to mm (3 inches~ 76 mm). Since that's not a regular modern size (e.g. 70, 80, 90) I'd round up to the nearest, which would be 80. The second number in modern tire sizes is the aspect ratio, that is the ratio of the height to the width (represented by a percentage). Since you coming over from a inch-based tire, it'd be 100 (i.e. 100%). If you wanted a tire that was 90% as tall as the tire is wide, your aspect ration would be 90. Assuming you want to keep it 100, then your tire size should be 80/100/-17. Motorcycle superstore lists a few at this size, most aggressive is probably the Shinko 241 or 244.
P.S. If you want to fit a bigger tire than factory, you need to check out your rim's width in the below table to see what's recommended. A lot of factory fitted tire sizes are a tad conservative. The "brat" style emphasizes huge tires, which can look cool to some people, but performance and safety can suffer.
Your rims are probably WM1 (1.60") or WM2 (1.85") so a 110/90 is over recommended size. That extra material has to go somewhere and it usually means the tires end up bulging (in ways that the manufacturer certainly didn't design for). I guess you could call it beefy...if you were Cartman.
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