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How To Read Motorcycle Tires

How to Read a Motorcycle Tire Graphic
  • 1 Nominal section width, expressed in metric, inch or alpha.
    See size chart below.
  • 2 Ratio between tire section height and nominal section width. This ratio is not indicated when section width is expressed in inches (eg. 3.50-18).
  • 3 Code for tire construction (- = Bias, R = Radial, B = Bias Belted).
  • 4 Nominal rim diameter size in inches.
  • 5 "Motorcycle" in abbreviated form. Differentiates motorcycle tires and rims from those designed for other vehicles. Not shown on all models.
  • 6 Expresses the tire's maximum load capacity (pounds) at the pressure indicated (psi).
    See load index chart below.
  • 7 Speed symbol. Indicates the tire's speed.
    See speed rating chart below.
  • 8 Tubeless (TL) or tubetype (TT), as applicable.
  • 9 The arrows indicated the direction of rotation of the tire according to the fitting position (front-rear); applicable for directional tires only.
  • 10 Number of plies and material.
  • 11 Abbreviation of "US Department of Transportation." Serves to indicate that the tire conforms to the regulations issued by the US Department of Transportation. Includes the serial # for the tire, and the last 3 or 4 numbers represent the date. Example 3805 means the tire was produced in the 38th week of 2005.
  • 12 Tread Wear Indicator, as applicable
  • 13 Brand name and registered trademark.
  • 14 Type of tread pattern and/or product line.
  • 15 Indicates where the tire was produced.

Size Chart

Size may be indicated in inches, metric, or by letters (alpha). The chart shows the approximate comparison of the different size indications.

Street Tire Size Conversion Chart

  • Inch
  • Metric
  • Alpha
  • 2.75/3.00
  • 80
  • MH
  • 3.25
  • 90
  • MJ
  • 3.50
  • 100
  • MM
  • 3.75/4.00
  • 110
  • MN/MP
  • 4.25/4.50
  • 120
  • MR
  • 5.00/5.10
  • 130
  • MT
  • 5.50
  • 140
  • MU
  • 6.00
  • 150
  • MV

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Load Index Chart

  • 47 = 386 lb.
  • 48 = 397 lb.
  • 49 = 408 lb.
  • 50 = 414 lb.
  • 51 = 430 lb.
  • 52 = 441 lb.
  • 53 = 454 lb.
  • 54 = 467 lb.
  • 55 = 481 lb.
  • 56 = 494 lb.
  • 57 = 507 lb.
  • 58 = 520 lb.
  • 59 = 536 lb.
  • 60 = 551 lb.
  • 61 = 567 lb.
  • 62 = 584 lb.
  • 63 = 600 lb.
  • 64 = 617 lb.
  • 65 = 639 lb.
  • 66 = 661 lb.
  • 67 = 677 lb.
  • 68 = 694 lb.
  • 69 = 716 lb.
  • 70 = 739 lb.
  • 71 = 761 lb.
  • 72 = 783 lb.
  • 73 = 805 lb.
  • 74 = 827 lb.
  • 75 = 853 lb.
  • 76 = 882 lb.
  • 77 = 908 lb.
  • 78 = 937 lb.
  • 79 = 963 lb.
  • 80 = 992 lb.
  • 81 = 1,019 lb.
  • 82 = 1,047 lb.
  • 83 = 1,074 lb.
  • 84 = 1,102 lb.
  • 85 = 1,135 lb.
  • 86 = 1,168 lb.
  • 87 = 1,202 lb.
  •  

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Speed Rating Chart

  • Rating
  • MPH
  • Rating
  • MPH
  • J
  • 62
  • L
  • 74
  • M
  • 81
  • P
  • 93
  • Q
  • 100
  • R
  • 106
  • S
  • 112
  • T
  • 118
  • H
  • 130
  • V/VB
  • 149
  • (V)/(VB)
  • 149+
  • W
  • 168
  • (W)
  • 168+

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