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Motorcycle Tyre Help
Motorcycle tyres are manufactured in multiple sizes, and in both imperial and metric variants. They also have different speed and load ratings. The tables below will help you perform the imperial/metric conversion and shed light onto the speed rating symbols.
| Speed symbol | J | K | L | M | N | P | Q | R | S | T | U | H | V | Z | W | Y |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Speed (km/h) | 100 | 110 | 120 | 130 | 140 | 150 | 160 | 170 | 180 | 190 | 200 | 210 | 240 | >240 | 270 | 300 |
| Speed (mph) | 62 | 68 | 75 | 81 | 87 | 93 | 99 | 106 | 112 | 118 | 124 | 130 | 149 | >150 | 168 | 186 |
| LI | lbs | KG | LI | lbs | KG | LI | lbs | KG | LI | lbs | KG | LI | lbs | KG |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 19 | 112.7 | 77.5 | 36 | 181.7 | 125.0 | 53 | 299.4 | 206.0 | 70 | 487.0 | 335.0 | 87 | 792.2 | 545.0 |
| 20 | 116.3 | 80.0 | 37 | 186.1 | 128.0 | 54 | 308.2 | 212.0 | 71 | 501.5 | 345.0 | 88 | 814.0 | 560.0 |
| 21 | 119.9 | 82.5 | 38 | 191.9 | 132.0 | 55 | 316.9 | 218.0 | 72 | 516.0 | 355.0 | 89 | 843.1 | 580.0 |
| 22 | 123.6 | 85.0 | 39 | 197.7 | 136.0 | 56 | 325.6 | 224.0 | 73 | 530.6 | 365.0 | 90 | 872.2 | 600.0 |
| 23 | 127.2 | 87.5 | 40 | 203.5 | 140.0 | 57 | 334.3 | 230.0 | 74 | 545.1 | 375.0 | 91 | 894.0 | 615.0 |
| 24 | 130.8 | 90.0 | 41 | 210.8 | 145.0 | 58 | 343.0 | 236.0 | 75 | 562.5 | 387.0 | 92 | 915.8 | 630.0 |
| 25 | 134.5 | 92.0 | 42 | 218.0 | 150.0 | 59 | 353.2 | 243.0 | 76 | 581.4 | 400.0 | 93 | 944.8 | 650.0 |
| 26 | 138.1 | 95.0 | 43 | 225.3 | 155.0 | 60 | 363.4 | 250.0 | 77 | 598.9 | 412.0 | 94 | 973.9 | 670.0 |
| 27 | 141.7 | 97.5 | 44 | 232.6 | 160.0 | 61 | 373.6 | 257.0 | 78 | 617.8 | 425.0 | 95 | 1003.0 | 690.0 |
| 28 | 145.4 | 100.0 | 45 | 239.8 | 165.0 | 62 | 385.2 | 265.0 | 79 | 635.2 | 437.0 | 96 | 1032.1 | 710.0 |
| 29 | 149.7 | 103.0 | 46 | 247.1 | 170.0 | 63 | 395.4 | 272.0 | 80 | 654.1 | 450.0 | 97 | 1061.1 | 730.0 |
| 30 | 154.1 | 106.0 | 47 | 254.4 | 175.0 | 64 | 407.0 | 280.0 | 81 | 671.6 | 462.0 | 98 | 1090.2 | 750.0 |
| 31 | 158.4 | 109.0 | 48 | 261.6 | 180.0 | 65 | 421.5 | 290.0 | 82 | 690.5 | 475.0 | 99 | 1126.5 | 775.0 |
| 32 | 162.8 | 112.0 | 49 | 268.9 | 185.0 | 66 | 436.1 | 300.0 | 83 | 707.9 | 487.0 | 100 | 1162.9 | 800.0 |
| 33 | 167.2 | 115.0 | 50 | 276.2 | 190.0 | 67 | 446.3 | 307.0 | 84 | 726.8 | 500.0 | - | - | - |
| 34 | 171.5 | 118.0 | 51 | 283.5 | 195.0 | 68 | 457.9 | 315.0 | 85 | 748.6 | 510.0 | - | - | - |
| 35 | 175.9 | 121.0 | 52 | 290.7 | 200.0 | 69 | 472.4 | 325.0 | 86 | 770.4 | 530.0 | - | - | - |
| Metric | Inch | Alpha |
|---|---|---|
| 80/90 | 2.75, (3.00) | (MH 90) |
| 90/90 | 3.00, (3.25), (3.60) | MH 90 |
| 100/90 | 3.25, (3.50), 3.60 | MJ 90 |
| 110/90 | 3.50, (3.75), 4.10 | ML 90 |
| 120/90 | 4.00, 4.25, 4.25/85, 4.60 | MN 90, MP 90 |
| 130/90 | 4.50, 5.00, 5.10 | MT 90 |
| 140/90 | 5.50 | MU 90 |
Please note: Values given in brackets are theoretically possible, but not recommended.
| Alpha | Size | Alpha | Size |
|---|---|---|---|
| H | 3.15 inch | R | 4.50 inch |
| J | 3.50 inch | S | 4.75 inch |
| L | 3.65 inch | T | 5.10 inch |
| M | 3.75 inch | U | 5.60 inch |
| N | 4.10 inch | V | 5.90 inch |
| P | 4.25 inch |
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