... . SOME DETAILS SOME THIS TIRE MODEL NUMBERRAWMATERIALPLY RATINGRUBBER CONTENTPORT300-18Natural rubber 6/8 PR 45% QINGDAO3. Below motorcycle tire size are available2 ... .75-18,2.75-19,2.75-21,3.00-8,3.00-10,3.00-10 TL,3.00-12 ... .25-17,3.25-18,3.25-19,3.50-8,3.50-10,3.50-10 TL,3.50-12 ... ,3.50-18,3.75-18,3.75-194.00-8,4.00-10,4.00-12,4.00-18,4 ...