Frequently Asked Tyre Questions

Most drivers struggle to understand tyre sizes let alone the codes used to name different tyres. With this in mind Yokohama Tyres has made their tyre range consumer-friendly. Yokohama tyres are the easiest to choose.

We've replaced the tyre codes with names. We've replaced the confusing tyre descriptions with simple ones. We've given each tyre a strong colour that's memorable. The colour theme runs through the advertising, driveway flags, tyre displays, tyre brochures and price list. So you can go into a Yokohama store and ask for the red one and the salesman behind the counter will know which tyre you're talking about.

Please click on each of the tyre questions to view answers below.

  • How do I find my tyre size?

    To find your tyre size you can look at the numbers on the side of your tyres. 

    You should check the size on the front tyres and rear tyres. Sometimes they differ. For example some Porsche and BMW cars often run wider tyres on the rear for more traction.

    If you have a secondhand vehicle it's best to check the tyre placard for the correct size as an alternative or incorrect tyre size may be fitted. 

    If your car is fitted with incorrect tyres it may not be covered by your insurance or your car may be defected if it is inspected by police.

    Tyre sizes explained tyre width tyre series tyre diameter

    Using the illustration above:

    215 is the tyre width in millimeters.
    It's measured across the tread from sidewall to sidewall.

    45 is the tyre series or profile.
    It's the height of the sidewall measured as a percentage or the width. Basically it's 45% of the tyre width which is 215mm. Nobody ever makes this calculation but the sidewall height would be about 96.7 mm.

    17 is the wheel diameter in inches.
    Wheels are measured in inches. So this tyre suits a wheel that's 17 inches in diameter.

    91 is the load rating.
    All you need to know is that the minimum load rating is specified by the manufacturer on the tyre placard and you can't choose a tyre with a lesser rating.

    The load rating means nothing without access to a load index table. The index is a numerical code associated with the maximum load a tyre can carry at the speed indicated by the speed symbol. A tyre with a 91 load rating is capable of carrying 615 kilos. Having 4 tyres the total load carried by the vehicle including it's own weight would be 2,460 kilos if the weight was evenly distributed. 

    W is the speed category.
    As with the load rating the manufacturer sets a minimum load rating alphabetically and you can't choose a tyre to the left of it on the alphabet. A W rated tyre can carry the load specified on the load rating up to 270 km/h. If you were to choose a V rated tyre it can only carry the load up to 240 km/h and would be too low.

  • What are the UTQGS treadwear and traction ratings on tyres?

    UTQGS stands for Uniform Tyre Quality Grading System.

    The UTQGS is an American government requirement from the Department Of Transport where tyres manufactured and sold in the USA must be grades with three specific markings on Treadwear, Traction and Temperature resistance.

    Yokohama Geolandar SUV UTQGS treadwear rating 600
    The Treadwear rating of 600 on the Geolandar SUV is very high indicating that these tyres should last a long time.

    UTQGS Treadwear Rating
    The treadwear grades are comparative under controlled conditions. A tyre graded 600 would wear twice as well as one graded 300.

    UTQGS Traction Rating
    There are 4 ratings AA, A, B and C. They indicate a tyre's ability to stop on wet pavement measured in controlled conditions. AA indicates the highest level of traction and C the lowest.

    UTQGS Temperature Rating
    The temperature grades A, B and C represent the tyre's resistance to heat under controlled conditions. If a tyre has good heat resistance it is considered durable and less likely to overheat and sustain damage. A is the highest rating and C represents the lowest resistance to heating.

    These ratings should be used as a rough guide only. The "controlled conditions" may not be relevant to the road surfaces and climate of Australian roads.

  • What is a tyre placard, and where can I find it?

    It's important to have the right tyres fitted to your vehicle for safety reasons as well as from both a legal and insurance perspective.

    Subaru Impreza 2009 Tyre Placard

    Since January 1973, new vehicles have been required by law to have a tyre placard affixed giving information about the designated tyres for the vehicle and recommended inflation pressures. 

    You will find the placard on the driver's door pillar, in the glove box, or sometimes in the boot or on the inside of the fuel filler flap. You should locate the placard on your vehicle and become familiar with this important information.

    For more details on tyre sizes and placards click here.

  • What tyre pressures do I use in ADVAN race tyres?

    With standard road cars fitted with road tyres we recommend following the car manufacturers tyre placard recommendations and setting the tyre pressures cold, before you drive. You can find more about this here.

    Racing tyres are completely different from road tyres. Yokohama suggests "hot pressures" for the tyre as a starting point. Then it's up to the racer to determine the optimum tyre pressure.

    Racing tyres are only available from the Yokohama motorsport dealer in each state. That's because the sizes, pressures and car set up require specialist advice. You can find the list of Yokohama motorsport dealers at the bottom of this page.

    Where things get a little complicated is with amateur track days. The Yokohama ADVAN Neova AD08 is a dual duty street and track tyre. It should set these up with cold pressures as per a normal street tyre for street driving. However, to get the best out of it at the race track you need to set up the "hot pressures" just like a race tyre.

    ADVAN Neovas are available from Tyres & More and Bob Jane T-Marts so you're unlikely to get the specialist advice a Yokohama motorsport dealer would provide. So our marketing manager, and resident track day nut, has written a helpful blog on setting hot pressures. This can also be used for ADVAN R-spec race tyres.

  • Why should you rotate your tyres?

    Having your car's tyres rotated at regular intervals can help your tyres last longer. If the style of driving you do is light you could have your tyres rotated every 8,000 kms. If your style of driving is hard have your tyres rotated every 5,000 kms.

    Why rotate your car's tyres?

    Each tyre on your car sees different levels of stress. The front tyres receive 80% of the braking force while the rears have an easy time with just 20%. If your car is also a front wheel drive the front tyres also have to grab for traction when you accelerate. Meanwhile the rear tyres just trail along. It's possible to buy 4 new tyres and wear out the front ones completely while the rear ones still have 80 - 90% of their original tread. The goal of tyre rotations is to make all your tyres wear evenly. This can include the spare.

    Moving the tyres around to different parts of the vehicle can also reduce tyre noise. Braking forces tend to wear tyre tread blocks in one direction creating "heel and toe" wear. The tread blocks begin stop looking square and start to resemble a saw tooth shape. This often causes tyres to become noisy. When the tyre is rotated to the other side of the car, so it turns in the opposite direction, this can even out the wear pattern making the tread blocks square again. Note this only works with non-directional tyres.

    Tyre rotations are a good opportunity to have your tyre pressures checked and adjusted and your wheel alignment checked.

    Volkswagen Polo driving around on bald tyres

    Tyre wear like this suggests a wheel alignment is necessary. Not to mention tyre replacement!!!

    It is much easier for your tyre specialist to perform this for you than for you to try it with limited equipment. It's also a good opportunity for them to keep an eye out for any signs of mechanical problems before they get worse.

  • What is a wheel alignment, and why is it important?

    Volkswagen Polo driving around on bald tyres

    Have you ever noticed your tyres (particularly the front) wearing on the edge but not across the tyre? 

    Tyres showing this, or even feathered edges, may indicate the wheel alignment needs adjusting. Most tyre services recommend a wheel alignment usually between 5,000 and 8,000 kilometers.

    The front (and sometimes the rear) wheels on a vehicle need to be adjustable to allow for variation in vehicle control characteristics. This can only be done by a technician using a wheel alignment machine. 

    There are various types of wheel alignments; the alignment you require depends on the make of vehicle you are driving.

    Correct wheel alignment will:

    • Extend the life of tyres by reducing premature wear
    • Allow tyres to wear more evenly
    • Improve the handling of the vehicle
    • Optimise the steering response of your vehicle

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