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 tireis often contained in the size marking, e.g., 130/90 x 16, etc.
Speed Ratings:
Tire manufacturers do not recommend the use of their products in excess of legal speed limits.
| R = 106 mph |
|
V = 150 mph |
| S = 112 mph |
|
W = 168 mph |
| T = 118 mph |
|
Z = 150 + (Contact Manufacturer) |
| H = 130 mph |
|
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Tire Size Markings:
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 charts give a guide to the relationship between various size markings.
Street Motorcycle Tire Size Conversion Chart
| Front Tires |
|
Rear Tires |
| Metric |
Alpha |
Inch |
|
Metric |
Alpha |
Inch |
| 80/90 |
MH |
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 |
|
130/80 |
- |
5.00/5.10 |
| 110/90 |
MN90 |
3.75/4.00 |
|
130/90 |
MT90 |
5.00/5.10 |
| 120/80 |
- |
4.25/4.50 |
|
140/80 |
- |
5.50/6.00 |
| 120/90 |
MR90 |
4.25/4.50 |
|
140/90 |
MU90 |
5.50/6.00 |
| 130/90 |
MT90 |
5.00/5.10 |
|
150/80 |
MV85 |
6.00/6.25 |
| - |
- |
- |
|
150/90 |
MB85 |
6.00/6.25 |
THESE CHARTS DO NOT IMPLY EXACT COMPARISONS.
Knobby Motorcycle Tire Size Conversion Chart
| Front Tires |
|
Rear Tires |
| Metric |
Alpha |
Inch |
|
Metric |
Alpha |
Inch |
| 60/100 |
90/80 |
2.50/2.75 |
|
80/100 |
80/90 |
2.50/3.60 |
| 70/100 |
90/90 |
2.75/3.00 |
|
90/100 |
110/90 |
3.60/4.10 |
| 80/100 |
100/80 |
3.00/3.25 |
|
100/100 |
120.80 |
4.00/4.10 |
| - |
- |
- |
|
110/100 |
130/80 |
4.10/4.50 |
| - |
- |
- |
|
120/100 |
140/80 |
5.00/5.10 |
THESE CHARTS DO NOT IMPLY EXACT COMPARISONS.
WARNING:
The above are size marking conversion charts only and do not imply the ability to interchange sizes.. Consult motorcycle 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. Wrong selection can result in tire failure, loss of control with serious injury or death.
Popular Abbreviations:
| B - Belted |
|
Pr - Ply rating |
|
TT - Tube Type |
| Blk - Black |
|
RBL - Raised Black Letters |
|
WW- White Wall |
| BW- Blackwall |
|
RWL - Raised White Letters |
|
WWW- Wide White Wall |
| NWW- Narrow White Wall |
|
SW- Slim Whitewall |
|
|
| OWL - Outlined White Letters |
|
TL - Tubeless |
|
|
Important Safety Information:
- Follow Tire Mounting Safety Precautions as specified by the tire manufacturer
- Checking of tire pressures is the most important tire-maintenance function you and your customer may perform. NOTE: For high-speed, fully loaded or dual-riding touring motorcycle applications, inflate front tires to maximum recommended by vehicle manufacturer for Dunlop fitment and rear tires to maximum load inflation pressure on sidewall. Rear touring tires must be inflated to a mini mum of 36 psi for light to medium loads and 40 psi for dual riding and other loads. Never exceed maximum load indicated on tire sidewall, or vehicle capacity load found in owner’s manual.
- Replacements for worn, differently patterned or constructed tires will not react the same. When new tires are fitted, they should not be subjected to maximum power, abrupt lean-over or hard cornering until a reasonable run-in distance of approximately 100 miles has been covered. This will permit the rider to become accustomed to the feel of the new tires or tire combination, find the edge, and achieve optimum road grip for a range of speed, acceleration and handling use. Advise your customer to check and adjust to recommended inflation pressure after tire cools for at least three (3) hours following run-in. Remember: New tires will have a very different contact patch and lean-over edge. New tires, new with older, as well as different pattern combinations require careful ride evaluation.
- The letters S, H, V, and Z included in the size markings of some of our street tires are speed ratings recognized by the European Tire and Rim Organization and Japanese Industry Standards. The ratings are assigned based upon controlled indoor wheel testing. Dunlop does not recommend the use of any of its products in excess of legal speed limits.
- For purposes of assessing clearance, inflated section width is not the tread width. Section width is the width of the tire measured from sidewall to sidewall at the widest point in the case of most tires. The exceptions are in some of the knobby tires where the knobs on the sidewall protrude farther than the section width.
- Metric-sized sport tires do not have the same load capacity as alpha-numeric (i.e., MT90H16) touring tires and should not be used for the same service.
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