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TIRE SIZES AND FREQUENTLY ASKED QUESTIONS  
This chart compiled by Pirelli will aid in the selection of comparable tires by cross-referencing metric, alpha and inch designations for most popular motorcycle street tire sizes.

FRONT  TIRES

METRIC ALPHA INCH
80/90 MH90 2.50/2.75
90/90 MJ90 2.75/3.00
100/90 MM90 3.25/3.50
110/90 MN90 3.75/4.00
120/80   4.25/4.50
120/90 MR90 4.25/4.50
130/90 MT90 5.00/5.10
 

REAR  TIRES

110/90

MP85 4.50/4.75
120/90 MR90 4.50/4.75
130/80   5.00/5.10
130/90 MT90 5.10/5.10
140/80 5.50/6.00
140/90  MU90  5.50/6.00
150/80 MV85 6.00/6.25 
150/90  MV85 6.00/6.25
 

FREQUENTLY ASKED QUESTIONS

Q.  What do speed ratings really mean?

A.  While not recognized by the U.S. Government, speed rating designations indicate that high speed testing has been performed on the tire.  The designation "S" refers to speeds up to 113 mph.  "H" refers to speeds up to 130 mph and "V" refers to speeds up to 150 mph.
 

Q.  What is the advantage to identical front and rear tread patterns?

A.  Handling dynamics such as straight-on tracking and cornering are enhanced when the same tread configuration is applied to the road surface by both front and rear tires, provided the particular tread design is appropriate. 


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