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DT Concours - Zirconite


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Tyre Care

Pneumatic Tyres
Because Rubber Pneumatic tyres can deform in order to take up small irregularities in the road surface the suspension and chassis are spared the vibration that would be transferred if the tyres where solid.

Top Ten Tyre Tips.

1. Check tyre pressure on a regular basis.
2. Never mix crossply/radial or directional/non directional on the same axle.
3. Tread depth should be at least 1.6 mm across 75% of tread depth, to be legal.
4. Be able to change your tyre in an emergency situation.
5. Keep tyre changing equipment in a serviceable condition.
6. Drive with care in adverse weather conditions - give your tyres a chance.
7. Be vigilant for damage to your tyres.
8. Look after your car's steering and suspension, as this will greatly affect tyre performance.
9. Choose the appropriate tyre size and speed rating recommended for your vehicle.
10. Any suspicions about your tyres - check it out!

Tyre Speed Ratings

Rating For Miles Per Hour
Up to 93 mph
Up to 99 mph
Up to 118 mph
Up to 130 mph
Up to 150 mph
Over 150 mph
Up to 87 mph
Up to 112 mph
Up to 169 mph


Tyre Size Coding

A tyre is referenced as "185/60R/15H", here is an explanation.

A = Width of Tyre (mm)
In this example it shows that the tyre is 185mm wide.
B = Profile as a % of width.
(i.e. profile is 60% of width)
In this example the ratio is 60%. This works out as 111mm.
C = Diameter of inner rim.
In this example it shows that the rim is 15" in diameter.


Tyre Pressures

Too much pressure (over inflated)

The tyre becomes hard and the contact area is reduced. Grip and performance is impaired especially in bad weather conditions and the steering becomes less assertive. Other symptoms include premature wear to the tyre in the centre.

Too little pressure (under inflated)

This is the most dangerous scenario. The tyre becomes less rigid and offers inferior control. Eventually, the tyre casing will break or crack, as the internal heat rises due to lack of air pressure.
The consequences can be severe. Because of the lack of pressure to hold the sidewalls fairly rigid the extra flexing can cause the walls to become weaker and may ultimately fail as speed and cornering forces increase. Tread pattern will suffer, with premature wear on the shoulders of the tyre and extreme cornering force can even cause the tyre to become detached from the rim.

It is essential to check your tyre pressure regularly!