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Canít understand what those numbers mean? Not sure how to convert metric to alpha? Were here to help!!! These simple conversion charts should offer some insight and help to understanding tire designations. Tires with 2.00, 2.25, and 2.50 nominal section widths are rated for 75 mph. Remember, tire safety requires proper care and use. All M-Rated motocross tires are non-DOT and feature no speed rating.
 

Convert your size to Inches, Metric, Or Alpha sizes with the chart below.

 
Front Tires  

Rear Tires

metric

alpha

inch

 

metric

alpha

inch

80/90

MH90

2.50/2.75

 

110/90

MP85

4.00/4.25

90/90

MJ90

2.75/3.00

 

120/90

MR90

4.50/4.75

100/90

MM90

3.25/3.50

 

130/90

  MT90

5.00/5.10

110/90

MN90

3.75/4.00

 

140/90

MU90

5.50/6.00

120/90

MR90

4.25/4.50

 

150/80

MV85

6.00/6.25

130/90

MT90

5.00/5.10

 

150/90

MV85

6.00/6.25

             

 

Motorcycle Knobby Tire Size

Front

Rear

Metric Old Metric Inch
60/ 100 90/ 80 2.50/ 2.75
70/ 100 90/ 90 2.75/ 3.00
80/ 100 100/ 80 3.25/ 3.50
     
     
Metric Old Metric Inch
80/ 100 80/ 90 2.50/ 3.60
90/ 100 110/ 80 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
 

Motorcycle Tire Speed Ratings, Load Ratings and Motorcycle Tire Size Designations

 

Speed Rating Chart

Motorcycle Speed Ratings

Maximum Design/Test Speed

J Type 62 100
N Type 87 140
P Type 94 150
S Type 112 180
H Type 130 210
V Type 149 240
Z Type 149+ 240+

Tires with 2.00, 2.25 & 2.50 nominal section widths are rated for 75 mph.

 

LOAD INDEX  (LI) RATING CHART

LI lbs. LI lbs. LI lbs. LI lbs. LI lbs.
20 176 33 254 46 375 59 536 72 783
21 182 34 260 47 386 60 551 73 805
22 187 35 267 48 397 61 567 74 827
23 193 36 276 49 408 62 584 75 853
24 198 37 282 50 419 63 600 76 882
25 204 38 291 51 430 64 617 77 908
26 209 39 300 52 441 65 639 78 937
27 215 40 309 53 454 66 661 79 963
28 220 41 320 54 467 67 677 80 992
29 227 42 331 55 481 68 694 81 1019
30 234 43 342 56 494 69 716 82 1047
31 240 44 353 57 507 70 736 83 1074
32 247 45 364 58 520 71 761 84 1102

 

STREET TIRE SIZE DESIGNATION

METRIC DESIGNATION

INCH DESIGNATION

ALPHABETICAL DESIGNATION