Jack Klarich
18000+ Posts
Some handy info
Tire Conversion Charts
Size Types
Motorcycle Speed Ratings
Load Indexes (L.I.)
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 |