Tyres are possibly the most important single part of the car. As they provide the contact with the road in a straight line or under the stress of a corner or braking.

At Clock Garage, Blackburn we will advise you on the correct tyres and whether your current tyres need replacing.

We have included this quick guide to give you an idea of how we go about checking your tyre is legal and safe. Uynlike many tyre centres we will not advise you to change all four tyres unless neccessary. However it is a good idea to change tyres on the same axle to ensure the you have the same grip. When changing a tyre we will check the vehicle tracking and correct it if neccessary, to ensure that the car is safe for your journeys.

How can you tell what tyres you need?

On your tyres you will find the numbers illustrated below. Point to each number to see what they mean

Tyre Dimensions
The first number is the width of the tyre from one side to the other in millimeters
The second number is a percentage of the first number to indicate the tyre height ie. In the exampe shown the tyre height would be 35% of 275 = 96.25mm
The next part is R19, the R stands for Radial and is irrelevant as all tyres are now radial tyres. The number is the wheel diameter the tyre will fit on in inches. Don't ask why it is in inches it just is!
The last number and letter are the load rating and speed rating. The load rating is the maximum load the tyre can sustain at 130mph, we will ensure this correct for you. The speed rating is the maximum speed the tyre can sustain for ten minutes with out falling apart. You are unlikely to reach this but insurers do insist that the correct speed rated tyre is on the car.

Tyre Safety

For peace of mind we recomend you check your tyres at least once every two weeks. You need to check:

  1. Tyre tread depth: The legal limit for this is 1.6mm across 75% of the tyre width, most manufacturers have a tread depth indicator set at 2mm. We recommend you change the tyres before reaching this though.
  2. Tyre pressure: If your tyres are not inflated correctly they will wear out more quickly and most improtantly will not work correctly when needed. Check your manual for the correct pressures for your car and then use a gauge to check as visually the tyres may look fine.
  3. Tyre wear: If the tyres are wearing across the entire width this indicates incorrect inflation. If they are wearing at one side then the tracking of your car needs checking. You also need to check the tyre wall for wear, both the outside and the inside.
  4. Final tyre check: Don't forget your car has FIVE wheels, the spare needs regular checking for correct inflation and any damage. If you do need to use your spare tyre only use it to get to a garage to get the tyre changed. Especially if it is a space saver spare. These are only designed for low speed and essential driving.