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Tire Conversions and Codes
Tire Conversion Chart
There are three different systems of tire measurement in use: Inch System (it is well known from tire size readings like 5.00-16 or 4.50/S/18) Alphanumeric System (the descriptions on tires are like MT 90-16 or MJ90-19) Metric System (for example 130/90-16). The last numbers are easy to read. They describe the rim size (which is equal with the inner diameter of the tire). Before that number there is normally a dash (-) or one of the letters H, S or V. This is the key to the speed range: (H) tires are admissible for speeds up to 130MPH, (S) tires are up to 112MPH, (V) tires for 150MPH and up. Series 90, Alphanumeric System and Series 80 are describing low-profile tires which means the height is smaller than the width and the proportions to the width is fixed (90% or 80% of the nominal width). Only in the Standard Inch-System can we find tires with equal width and height, which is then a square-profile. Metric Alpha Numeric Inch-System 80/90 MH90 2.50 to 2.75 90/90 MJ90 2.75 to 3.00 100/90 MM90 3.25 to 3.50 110/90 MN90 3.75 to 4.00 120/80 4.25 to 4.50 120/90 MR90 4.25 to 4.50 130/80 5.00 to 5.10 130/90 MT90 5.00 to 5.10 140/80 5.50 to 6.00 140/90 MU90 5.50 to 6.00 150/80 MV85 6.00 to 6.25 150/90 MV85 6.00 to 6.25 Motorcycle Street Tire Speed Rating Chart Symbol Maximum 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 Z---------149 MPH W---------168 MPH Y---------186 MPH Tire Load Index L.I. LB. 33 254 34 260 35 267 36 276 37 282 38 291 39 300 40 309 41 320 42 331 43 342 44 353 45 364 46 375 47 386 48 397 49 408 50 419 51 430 52 441 53 454 54 467 55 481 56 494 57 507 58 520 59 536 60 551 61 567 62 584 63 600 64 617 65 639 66 661 67 677 68 694 69 716 70 739 71 761 72 783 73 805 74 827 75 853 76 882 77 908 78 937 79 963 80 992 (RK, thanks for putting this up! 8)
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