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MOTORCYCLE TYRE SIZE CONVERSION CHART

This information must only be used as a guide. If in doubt about specific fittings always follow manufacturers recommendations.

For new tyres to provide best performance possible, they should be allowed to go through a suitable running-in period. A minimum distance of 100 miles is recommended before being subjected to maximum power or extreme conditions. The running-in period allows for the tyre to be scuffed enabling grip and handling to reach its intended potential.

Always ensure sufficient clearance between the tyre and other parts of the motorcycle such as mudguard, chain etc, as heat, and centrifugal forces caused by riding can increase overall diameter of the tyre during use.

Tyres should carry a sufficient speed and load rating to correspond with the machines capabilities.

Motorcycle Street Tyre Size Conversion Chart
Front Tyres Rear Tyres
Metric Alpha Inch Metric Alpha Inch
80/90 MH 2.50/2.75 110/90 MP85 4.50/4.75
90/90 MJ90 2.75/3.00 120/90 MR90 4.50/4.75
100/90 MM90 3.25/3.50 130/80   5.00/5.10
110/90 MN90 3.75/4.00 130/90 MT90 5.00/5.10
120/80   4.25/4.50 140/80   5.50/6.00
120/90 MR90 4.25/4.50 140/90 MU90 5.50/6.00
130/90 MT90 5.00/5.10 150/80 MV85 6.00/6.25
      150/90 MV85 6.00/6.25
Motorcycle Knobby Tyre Size Conversion Chart
Front Tyres Rear Tyres
Metric Metric Inch Metric Metric Inch
60/100 90/80 2.50/2.75 80/100 80/90 2.50/3.60
70/100 90/90 2.75/3.00 90/100 110/90 3.60/4.10
80/100 100/80 3.00/3.25 100/100 120/80 4.00/4.10
  110/100 130/80 4.00/4.50
120/100 140/80 5.00/5.10
Tyre Speed Rating Chart
Tyre Speed Ratings Max. Design Speed Test Speed
J Type 62 100
N Type 87 140
P Type 94 150
S Type 112 180
T Type 118 190
H Type 130 210
V Type 149 240
Z Type 149+ 240+

Note: Tyres with 2.00, 2.25 & 2.50 nominal section widths are rated for 75 mph.

Motorcycle Tyre Load Index Chart
LI = Load Index. KG = 2.2 lbs.

LI KG LBS LI KG LBS LI KG LBS
43 155 342 59 243 536 75 387 853
44 160 353 60 250 531 76 400 882
45 165 364 61 257 567 77 412 908
46 170 375 62 265 584 78 425 937
47 175 386 63 272 600 79 437 963
48 180 397 64 280 617 80 450 992
49 185 408 65 290 639 81 462 1019
50 190 419 66 300 661 82 475 1047
51 195 430 67 307 677 83 487 1074
52 200 441 68 315 694 84 500 1102
53 206 454 69 325 716 85 515 1135
54 212 467 70 335 739 86 530 1168
55 218 481 71 345 761 87 545 1201
56 224 494 72 355 783 88 560 1235
57 230 507 73 365 805 89 580 1279
58 236 520 74 375 827 90 600 1323

Inner Tube Fitment Guide

Tube Size Will Fit Tyre Size:
2.50/2.75 - 8 2.50 - 8 2.75 - 8        
3.00/3.25 - 8 3.00 - 8 3.25 - 8        
3.50/4.00 - 8 3.50 - 8 4.00 - 8        
2.50/2.75 - 10 2.50 - 10 2.75 - 10        
3.00/3.25 - 10 3.00 - 10 3.25 - 10 80/90 - 10      
3.50/4.00 - 10 3.50 - 10 4.00 - 10 100/90 - 10      
2.75/3.00 - 12 2.75 - 12 3.00 - 12 80/100 - 12 100/80 - 12    
3.00/3.25 - 12 3.00 - 12 3.25 - 12 80/100 - 12 100/80 - 12    
2.75/3.00 - 14 2.75 - 14 3.00 - 14 3.60 - 14 80/80 - 14    
3.50/3.75 - 14 3.50 - 14 3.75 - 14 4.10 - 14 110/80 - 14    
2.75/3.00 - 16 2.75 - 16 3.00 - 16 80/100 - 16 80/90 - 16    
3.00/3.25 - 16 3.00 - 16 3.25 - 16 90/90 - 16 100/80 - 16    
3.25/3.50 - 16 3.25 - 16 3.50 - 16 100/90 - 16 90/100 - 16 90/90 - 16 100/80 - 16
4.00/4.60 - 16 4.00 - 16 4.60 - 16 120/80 - 16 110/90 - 16 120/90 - 16  
5.00/5.10 - 16 5.00 - 16 5.10 - 16 130/90 - 16 140/80 - 16 140/90 - 16 150/80 - 16
2.25/2.50 - 17 2.25 - 17 2.50 - 17 3.10 - 17 70/100 - 17    
2.75/3.00 - 17 2.75 - 17 3.00 - 17 3.10 - 17 80/90 - 17 100/80 - 17  
3.00/3.25 - 17 3.00 - 17 3.25 - 17 100/80 - 17      
3.25/3.50 - 17 3.25 - 17 3.50 - 17 110/80 - 17      
3.75/4.00 - 17 3.75 - 17 4.00 - 17 120/80 - 17      
4.00/4.50 - 17 4.00 - 17 4.50 - 17 4.25 - 17 4.60 - 17 110/90 - 17 110/100 - 17
120/80 - 17
120/90 - 17
130/70 - 17
130/80 - 17
5.00/5.10 - 17 5.00 - 17 5.10 - 17 130/90 - 17 140/80 - 17 140/90 - 17 5.30 - 17
2.25/2.50 - 18 2.25 - 18 2.50 - 18 3.10 - 18      
2.50/2.75 - 18 2.50 - 18 2.75 - 18 3.10 - 18 80/90 - 18    
2.75/3.00 - 18 2.75 - 18 3.00 - 18 3.60 - 18 80/90 - 18 90/90 - 18 80/100 - 18
3.00/3.25 - 18 3.00 - 18 3.25 - 18 3.60 - 18 90/90 - 18    
3.25/3.50 - 18 3.25 - 18 3.50 - 18 3.60 - 18 4.10 - 18 90/90 - 18 90/100 - 18
100/90 - 18
110/80 - 18
3.50/4.00 - 18 3.50 - 18 4.00 - 18 4.10 - 18 4.25 - 18 4.60 - 18 100/90 - 18
100/100 - 18
110/80 - 18
110/90 - 18
120/80 - 18
3.75/4.00 - 18 3.75 - 18 4.00 - 18 4.25 - 18 4.60 - 18 100/100 - 18 110/90 - 18
120/80 - 18
4.00/4.50 - 18 4.00 - 18 4.50 - 18 4.25 - 18 4.60 - 18 4.70 - 18 110/90 - 18
110/100 - 18
120/80 - 18
130/70 - 18
120/90 - 18
130/80 - 18
5.00/5.10 - 18 5.00 - 18 5.10 - 18 130/90 - 18 140/80 - 18 140/90 - 18 120/100 - 18
140/70 - 18
2.50/2.75 - 19 2.50 - 19 2.75 - 19 70/100 - 19      
2.75/3.00 - 19 2.75 - 19 3.00 - 19 3.60 - 19 90/90 - 19    
3.00/3.25 - 19 3.00 - 19 3.25 - 19 3.60 - 19 90/90 - 19    
3.25/3.50 - 19 3.25 - 19 3.50 - 19 3.60 - 19 4.10 - 19 90/90 - 19 100/90 - 19
110/80 - 19
3.50/4.00 - 19 3.50 - 19 4.00 - 19 4.10 - 19 4.25 - 19 4.60 - 19 100/90 - 19
110/80 - 19
110/90 - 19
120/80 - 19
4.00/4.25 - 19 4.00 - 19 4.25 - 19 110/90 - 19 120/80 - 19 120/90 - 19  
2.50/2.75 - 21 2.50 - 21 2.75 - 21 70/100 - 21 80/80 - 21 80/90 - 21 90/80 - 21
2.75/3.00 - 21 2.75 - 21 3.00 - 21 80/90 - 21 80/100 - 21 90/80 - 21 90/90 - 21
100/80 - 21
2.75/3.00 - 22 2.75 - 22 3.00 - 22        
2.75 - 23 2.75 - 23