Some handy info
Tire Conversion Charts
Motorcycle Street Tire Size Conversion Chart Front Tires Metric Alpha Inch 80/90 MH 2.50/2.75 90/90 MJ90 2.75/3.00 100/90 MM90 3.25/3.50 110/90 MN90 3.75/4.00 120/80 N/A 4.25/4.50 120/90 MR90 4.25/4.50 130/90 MT90 5.00/5.10 Rear Tires Metric Alpha Inch 110/90 MP85 4.50/4.75 120/90 MR90 4.50/4.75 130/80 N/A 5.00/5.10 130/90 MT90 5.00/5.10 140/80 N/A 5.50/6.00 140/90 MU90 5.50/6.00 150/80 MV85 6.00/6.25 150/90 MV85 6.00/6.25 N/A Motorcycle Off-Road Tire Size Conversion Chart Front Tires Metric Alpha Inch 60/100 90/80 2.50/2.75 70/100 90/90 2.75/3.00 80/100 100/80 3.00/3.25 Rear Tires Metric Alpha Inch 80/100 80/90 2.50/3.60 90/100 110/90 3.60/4.10 100/100 120/80 4.00/4.10 110/100 130/80 4.00/4.50 120/100 140/80 5.00/5.10
Size Types
Motorcycle Speed Ratings
Speed Symbol Max Speed Speed Symbol Max Speed Speed Symbol Max Speed J 62 mph K 68 mph L 75 mph M 81 mph N 87 mph P 93 mph Q 99 mph R 106 mph S 112 mph T 118 mph U 124 mph H 130 mph V 149 mph W 168 mph Y 186 mph
Load Indexes (L.I.)
L.I. lbs. L.I. lbs. L.I. lbs. 33 254 49 408 65 639 34 260 50 419 66 661 36 276 52 441 68 694 37 282 53 454 69 716 38 291 54 467 70 739 39 300 55 481 71 761 40 309 56 494 72 783 41 320 57 507 73 805 42 331 58 520 74 827 43 342 59 536 75 853 44 353 60 551 76 882 45 364 61 567 77 908 46 375 62 584 78 937 47 386 63 600 79 963 48 397 64 617 80 992