ASPECT RATIO
The aspect ratio of a tire is the relationship of the tire cross section height to the cross section width. In a tire with an aspect ratio of 85, for example, height is about 85% of the tire width. "Low Profile" tires have an aspect ratio of less than 80. The aspect ratio of a tire is often contained in the size marking, e.g., 130/90x16, etc.
SPEED RATINGS (Sustained Speed)
R = 106 MPH
S = 112 MPH
T = 118 MPH
H = 130 MPH
V = 150 MPH
Z = 150+ MPH (Contact Manufacturer)
TIRE SIZE MARKING
Motorcycle tires are manufactured in a number of different countries with differing requirements in terms of load, dimensions and speed ratings. This has resulted in various size markings. The following chart gives a guide to the relationship between various size markings.
MOTORCYCLE STREET TIRE SIZE CONVERSION CHART
WARNING
The above are size marking conversion charts only and do not imply interchangeability. Consult motorcycle dealer or manufacturer for correct replacements for original equipment tires. Critical clearances, motorcycle compatibility and stability, load bearing capacity, speed rating, radial versus non-radial, pattern and tread compound requirements, inflation recommendations, and front to rear matching will all vary with tire selection. The wrong selection can result in tire failure, loss of control, serious injury or death.
Tire Rating
Size designation
ABBREVIATIONS
B = Belted
Blk = Black
BW = Black Wall
Pr = Ply Rating
RWL = Raised White Letters
SW = Striped Wall
TL = Tubeless
TT = Tube Type
WW = White Wall
WWW = Wide White Wall
WSW = Wide Stripe Wall