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| ===== National Highway Traffic Safety Administration (UTQG) Grading System ===== | ===== National Highway Traffic Safety Administration (UTQG) Grading System ===== | ||
| - | |The National Highway Traffic Safety Administration has established the UTQG grading system, the Uniform Tire Quality Grading, to assist consumers in their purchase of tires. Basically it's another tool to be used besides the opinions you gather from trusted friends, mechanics and whatever other sources you may have at your disposal. The key to using this system is to understand that it is a relative comparison system. The UTQG is not a safety rating and not a guarantee that a tire will last for a prescribed number of miles. Under UTQG, manufacturers use three criteria to grade tires: Traction,Temperature and Treadwear. The information is right where you need it when buying the tire: 1, On the paper label affixed to the tread and 2, On the tire molded into the sidewall. ((slcharger of the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=1984086&highlight=tire+compound))The tests are also done in a lab, making it possible to gather much more empirical data, but also calling into question the exact application of that data to real-world conditions.((http://tires.about.com/od/understanding_tires/a/Uniform-Tire-Quality-Grading-Explained.htm))||| | + | |The National Highway Traffic Safety Administration has established the UTQG grading system, the Uniform Tire Quality Grading, to assist consumers in their purchase of tires. Basically it's another tool to be used besides the opinions you gather from trusted friends, mechanics and whatever other sources you may have at your disposal. The key to using this system is to understand that it is a relative comparison system. The UTQG is not a safety rating and not a guarantee that a tire will last for a prescribed number of miles. Under UTQG, manufacturers use three criteria to grade tires: Traction,Temperature and Treadwear. The information is right where you need it when buying the tire: 1, On the paper label affixed to the tread and 2, On the tire molded into the sidewall. ((slcharger of the XLFORUM http://xlforum.net/forums/showthread.php?t=1984086&highlight=tire+compound))The tests are also done in a lab, making it possible to gather much more empirical data, but also calling into question the exact application of that data to real-world conditions.((http://tires.about.com/od/understanding_tires/a/Uniform-Tire-Quality-Grading-Explained.htm))||| |
| ^UTQG Traction Grades^^^ | ^UTQG Traction Grades^^^ | ||
| |Specifications are based on tests to determine the tire's coefficient of friction on wet asphalt and wet concrete at 40 mph. The tire is given a letter grade depending on the amount of G's the tire can withstand on each surface. The grades are as follows:((http://tires.about.com/od/understanding_tires/a/Uniform-Tire-Quality-Grading-Explained.htm))||| | |Specifications are based on tests to determine the tire's coefficient of friction on wet asphalt and wet concrete at 40 mph. The tire is given a letter grade depending on the amount of G's the tire can withstand on each surface. The grades are as follows:((http://tires.about.com/od/understanding_tires/a/Uniform-Tire-Quality-Grading-Explained.htm))||| | ||
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| |The traction test does not evaluate the tire's ability to perform dry braking, dry or wet cornering or hydroplaning resistance. These are rather important qualities as well. To evaluate a tire's traction based solely on wet braking is somewhat oversimplifying actual tire performance. A tire that is graded as A for wet braking might well have better lateral grip than another tire graded AA.((http://tires.about.com/od/understanding_tires/a/Uniform-Tire-Quality-Grading-Explained.htm))||| | |The traction test does not evaluate the tire's ability to perform dry braking, dry or wet cornering or hydroplaning resistance. These are rather important qualities as well. To evaluate a tire's traction based solely on wet braking is somewhat oversimplifying actual tire performance. A tire that is graded as A for wet braking might well have better lateral grip than another tire graded AA.((http://tires.about.com/od/understanding_tires/a/Uniform-Tire-Quality-Grading-Explained.htm))||| | ||
| ^UTQG Temperature Grades^^^ | ^UTQG Temperature Grades^^^ | ||
| - | |Temperature grading is based on the tire's ability to dissipate heat while running at high speed against a rotating cylinder. A tire that cannot dissipate heat effectively will break down faster at higher speeds. ((http://tires.about.com/od/understanding_tires/a/Uniform-Tire-Quality-Grading-Explained.htm))The "A" rated tire is the coolest running, and even though the "C" tire runs hotter it does not mean it is unsafe. The temperature grade is established for a tire that is properly inflated and not overloaded.((slcharger of the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=1984086&highlight=tire+compound))||| | + | |Temperature grading is based on the tire's ability to dissipate heat while running at high speed against a rotating cylinder. A tire that cannot dissipate heat effectively will break down faster at higher speeds. ((http://tires.about.com/od/understanding_tires/a/Uniform-Tire-Quality-Grading-Explained.htm))The "A" rated tire is the coolest running, and even though the "C" tire runs hotter it does not mean it is unsafe. The temperature grade is established for a tire that is properly inflated and not overloaded.((slcharger of the XLFORUM http://xlforum.net/forums/showthread.php?t=1984086&highlight=tire+compound))||| |
| ^Temperatue Grade^Speed (mph)^^ | ^Temperatue Grade^Speed (mph)^^ | ||
| |A|Means that the tire is able to run for long periods of time at speeds over 155 miles per hour|| | |A|Means that the tire is able to run for long periods of time at speeds over 155 miles per hour|| | ||
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| |200| Tread life is twice the treadwear of the control tire|| | |200| Tread life is twice the treadwear of the control tire|| | ||
| |400| Treadlife is four times the treadwear of the control tire|| | |400| Treadlife is four times the treadwear of the control tire|| | ||
| - | | However, another tire manufacturer may grade a comparable design 300, so a grade of 150 would last just half as long under their grading scheme. The lesson learned is to not to use one manufacturer's grade versus the other, but instead to compare tire grades within a given brand. Actual treadwear performance can vary tremendously according to the tire's real-world use. Variations in driving habits, service practices (most importantly air pressure maintenance), road conditions and climate affect tire life((slcharger of the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=1984086&highlight=tire+compound))||| | + | | However, another tire manufacturer may grade a comparable design 300, so a grade of 150 would last just half as long under their grading scheme. The lesson learned is to not to use one manufacturer's grade versus the other, but instead to compare tire grades within a given brand. Actual treadwear performance can vary tremendously according to the tire's real-world use. Variations in driving habits, service practices (most importantly air pressure maintenance), road conditions and climate affect tire life((slcharger of the XLFORUM http://xlforum.net/forums/showthread.php?t=1984086&highlight=tire+compound))||| |
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| ==== How Long Will a Tire Last? ==== | ==== How Long Will a Tire Last? ==== | ||
| - | * Tires don't have any "life", they are sacrificial by design. If a tire was made that lasted forever it would have no traction (even a brick won't last forever)(a tire will last longer)((ryder rick from the XLFORUM http://xlforum.net/vbportal/forums/showthread.php?t=1997899&highlight=tire+compound&page=2)) | + | * Tires don't have any "life", they are sacrificial by design. If a tire was made that lasted forever it would have no traction (even a brick won't last forever)(a tire will last longer)((ryder rick from the XLFORUM http://xlforum.net/forums/showthread.php?t=1997899&highlight=tire+compound&page=2)) |
| * A telltale sign that your tires are becoming old is if they have become weather checked (cracked around the circumference). But that doesn't always have to be the case. Many tire manufacturers actually add anti-oxidants to help prevent the breakdown from exposure to air. The integrity of the tire could still be compromised with increased age though. It's because of this and the fact that not all tires are manufactured the same that it's a good rule of thumb to try to purchase tires with the newest manufacturer date. This date will be printed on the sidewall of the tire. The large turnover of tires at retailers usually helps ensure that you are buying the newer tires. ((https://www.denniskirk.com/learn/motorcycle-tire-guide)) | * A telltale sign that your tires are becoming old is if they have become weather checked (cracked around the circumference). But that doesn't always have to be the case. Many tire manufacturers actually add anti-oxidants to help prevent the breakdown from exposure to air. The integrity of the tire could still be compromised with increased age though. It's because of this and the fact that not all tires are manufactured the same that it's a good rule of thumb to try to purchase tires with the newest manufacturer date. This date will be printed on the sidewall of the tire. The large turnover of tires at retailers usually helps ensure that you are buying the newer tires. ((https://www.denniskirk.com/learn/motorcycle-tire-guide)) | ||
| * Service life is dependent on many variables such as inflation pressure, storage, driving conditions, loads, general maintenance and abuse. ((http://www.dunlopmotorcycletires.com/care/faq/)) | * Service life is dependent on many variables such as inflation pressure, storage, driving conditions, loads, general maintenance and abuse. ((http://www.dunlopmotorcycletires.com/care/faq/)) | ||
