Puncture Repairs
Before we carry out any puncture repair we will need to inspect the tyre(s) to asses if a repair is suitable.
 

 Request a Quote For New Tyres

 
Tyre Width (Shown as 225 (in Red in above image))
This is the width of the tyre, measured in millimeters, sizes range from 135 to 355. Common sizes are 175, 185, 195, 205, 215, 225 and 235.
 
Tyre Profile (Shown as 45 (in Yellow in above image))
This is a percentage of the width of the tyre, so on our example 45 is actually 45% of the tyre width which is really 101.25mm
 
Wheel size or diameter of the inner rim (Shown as 18  (in Green in above image))
This is the size of the wheel which the tyre fits on and is measured in inches and is usually preceded with the letter R.
 
Load index (Shown as 91  (in Blue in above image))
This is the maximum load or weight a tyre can support and the higher the number the greater the load. Smaller cars will have a lighter Load Index than say a 4x4 which is heavier and requires stronger tyres to support its weight.
 
Speed Index (Shown as W (in Purple in above image))
Corresponding to the tyres maximum speed. It is prohibited to fit tyres with a speed index below that recommended by the manufacturer of your vehicle.
 
A list of the most common codes and speeds is below.
 
T – 118 mph
H – 130 mph
V – 149 mph
Z - 150+ mph
W – 168 mph
Y – 186 mph
 
Tyre wear
Here at Unit4 we cannot stress how important the tyres on your vehicle are, they are the only part of you vehicle in contact with the road and they are what helps you vehicle stop, corner and accelerate. If they are damaged or badly worn then your vehicles ability to do these things is diminished – This is also why Tyres are part of the MOT test which cars have to under go and a yearly basis.
 
You should regularly check your tyres to make sure that they are within the permissible legal limit for wear, this is currently 1.6mm and tyres falling below this level may incur a fine if stopped and checked by the police. Not only is it illegal, it is also dangerous as the lower the tread on your tyres the less they work as designed especially when it comes to stopping distances. A normal tyre with some wear will stop your car quicker than tyres with near, on or below the legal limit. By a considerable margin – almost twice the distance. Once a tyre is within its legal wear limit it should be replaced at the first available opportunity.
 
Wear however can occur in a number of ways, it doesn’t always happen at a uniform depth right across the tyre. Here are a few scenarios which you might encounter and the solutions to these problems.
 
Both Edges are Worn – This is a sign of under inflation, not enough air. Check you tyre pressures, the correct pressure will be written on the tyre or on the fuel filler flap or in the drivers door jam.
 
Worn in the middle – This is a sign of over inflation, too much air. Check you tyre pressures, the correct pressure will be written on the tyre or on the fuel filler flap or in the drivers door jam.
 
Worn on one side only – Your wheels are incorrectly aligned and your vehicle needs the tracking checking. Bring your vehicle to Unit4 and get the tracking done via laser alignment, which checks all the wheels are pointing in the right direction to specifications supplied by the manufacturer. Correct alignment will not only make your car handle better it will prolong tyre life.
 
Tyres Worn unevenly – The wheel is out of balance, or the tracking maybe out. Bring your vehicle to Unit4 and get the tracking done via laser alignment, which checks all the wheels are pointing in the right direction to specifications supplied by the manufacturer. Correct alignment will not only make your car handle better it will prolong tyre life.
 
Bald spots or uneven wear – This maybe a symptom of badly balanced wheels or even that the shock absorbers on you car are worn or broken.
 
Incorrectly balanced or damaged wheels – The biggest tell tale sign of a badly balanced wheel is that the car feels like its wobbling at specific speed. Slow down it goes away, speed up it gets worse or goes away. Badly balanced does not mean the tyre fitters have made an error. Perhaps you have lost a balance weight or incurred damage to your wheel. A badly balance wheel should be checked quickly as it may also be the start of one of the problems listed above.