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When you need to stop, you need to do so quickly and safely regardless of the situation or type of road you're driving on. Not everyone realises how important tyres are to stopping distances and effective braking. So the Kwik Fit tyre team thought it best to give the topic the attention it deserves. Read on to find out more about the role your tyres play in helping you stop.
According to the Highway Code, what we refer to as “stopping distance” actually consists of two phases. First, there’s “thinking distance” – the time it takes for the driver to react. And second comes “braking distance” – how far the car travels until it stops after the brakes have been applied. Braking distances can double when it’s wet. Yes, that’s right, double.
What is stopping distance?
The distance required to bring a moving car to a complete stop is referred to as stopping distance. It comprises the time it takes to react to the hazard (thinking distance) as well as the time it takes for the brakes to come to a stop (braking distance). The entire stopping distance is determined by the driver's reflexes, the vehicle being driven, the weather, and the speed of the vehicle.
What is the stopping distance formula UK?
Calculating stopping distance is done by adding the thinking and braking distances.
Tyre condition affects stopping distances
Worn or incorrectly-inflated tyres pose a serious
risk, not only to drivers and their passengers but to other road users and
pedestrians too. Both issues affect the way your tyre is able to grip the road and expel water through its tread in wet driving conditions.
Worn tyres? They’re dangerous, full stop.
Pioneered by engineers at Continental Tyres in 1904, tyre treads – the grooves on the tyre – were designed to expel road-surface water, so that the tyres rubber can grip the road. While new tyres are very effective at this, worn tyres are not.
Imagine two cars both travelling at 50 mph. Car A
has brand new tyres with 8mm tread all round, while Car B’s tread is just about
legal at 1.6mm. If both drivers brake at the same time, Car A will stop nearly
14 metres shorter than Car B – that‘s three car lengths! Now imagine what could
be in Car B’s path… Learn more about why tyre tread depth is so important on our blog. In the meantime, book in a free tyre check with Kwik Fit today for peace of mind about your tyres.
Under-inflated tyres make your car more difficult to control because the tyres can’t get a proper grip on the road surface. When tyres have too much air in them, the part of the tyre that makes contact with the road is reduced which results in less grip. Less grip means it takes longer to stop, whatever the weather.
As well as being unsafe, incorrectly-inflated tyres
wear out unevenly and need replacing more often. Under-inflated tyres wear at
the edges which affects driver handling. Over-inflated tyres, on the other hand, wear more at
the tyre centre, resulting in a loss of tyre tread just where it makes most
contact with the road and where you need the most grip.
Shorter stopping distances mean being safer
everywhere
Wherever you drive, you always need to be prepared to stop.
In towns and cities, you'll need to be alert to pedestrians, particularly children who can step out without warning. In the countryside, it could be an oncoming car on a narrow lane. On the motorway a sudden build-up of traffic might mean you’re suddenly braking to avoid coming into contact with the cars ahead. In all of these situations, your ability to stop quickly can prevent accidents and save lives, including your own.
Are premium tyres safer for reducing stopping
distances?
Why pay extra for premium tyres? It’s a question we’re often asked at Kwik Fit, and we understand why. Alongside evidence that premium tyres are in fact less expensive over time than budget tyres comes another, much more important answer. If you value your safety and that of the people around you, it’s clear that premium tyres are the correct choice.
Your ability to react quickly, your brakes and the tyres you purchase are the three crucial factors in being able to stop quickly and safely. And the truth is that, due to their lower quality rubber composition, budget tyres just aren’t as effective at gripping the road, resulting in a significantly longer stopping time and distance, especially in wet conditions.
Next steps to ensuring safer stopping distances
If you’re concerned about the quality of your tyres
and want expert advice on the best ones to buy for your car, get in touch with your nearest KwikFit team for impartial advice. Our tyre team can also answer any questions you
have about stopping distances, how to spot the signs of tyre wear, and advise
you on tyre pressures. Contact us today.
Driving in heavy rain can be tricky and bring extra risks. Check out our guide for top tips to stay safe and avoid breakdowns if travelling in wet conditions.
Is the UK on the verge of ‘the coldest winter for 50 years?’ Even if El Niño doesn't hit the UK this winter, reduce the risk of a winter breakdown by making sure your car battery is winter-ready.
Your tyre size can be found on the sidewall of your current tyre and is a sequence of numbers and letters. The most common tyre size in the UK is 205/55R16 but there are many variations so it’s important to check your existing tyre first before searching for tyres.
Tip: Take a photo of your existing tyre sidewall to make it easier to identify your tyre size using the guide below.
The first three digits. This displays the width of the tyre in millimetres. A tyre marked 225 will measure 225mm across the tread from sidewall to sidewall.
Aspect Ratio
The fourth and fifth digits of the tyre code that immediately follow the tyre width. The aspect ratio or profile height of the tyre sidewall is expressed as a percentage of the tyre width. So an aspect ratio of 55 for example means that the profile height of the tyre is 55% of its width.
Rim Diameter
The next two digits represent the size of the wheel rim that the tyre can be fitted to. It is also the diameter of the tyre from bead to bead. So a tyre marked 16 will fit on a 16-inch wheel rim.
Speed Rating
The speed rating of a tyre is represented by a letter of the alphabet at the end of the tyre size code and indicates the maximum speed capability of the tyre. Tyres receive a speed rating based on a series of tests which measure the tyres capability to handle a set speed for a prolonged period of time.
Select your tyre speed rating to find out the maximum speed your tyres can maintain.
If you are unsure what speed rating you need, be sure to check your vehicle handbook. Choosing a lower speed rating than that recommended by your vehicle manufacturer could potentially invalidate your insurance.
Load Rating
The load index provides information on the maximum weight capability for the tyre. The load index is a numerical code that can be located just after the tyre size marking and before the speed rating.
Select your load index to find out the maximum load capability for your tyres.
Although not illegal, it is not advisable to have tyres with a lower speed rating or load index than the manufacturer recommended tyre specification for your vehicle, or to have a combination of different tyre construction types. Consult your vehicle handbook to confirm your vehicle’s tyre speed rating and load index as well as any additional requirements.
0800 75 76 77 You can reach our customer care team 6 days a week from 9:00am to 6:00pm on Monday and Thursday, 8:30am to 6:00pm Tuesday, Wednesday and Friday, 8:30am to 5:00pm Saturday, and 10:00am to 4:00pm on Bank Holidays.
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We endeavour to ensure we are displaying the correct tyres for your vehicle. However, we recommend all customers check the tyre size printed on the side wall of their tyres before proceeding with a tyre purchase as occasionally discrepancies do occur. By selecting the tyre sizes above and clicking 'Continue', you are indicating that you have checked your tyre sizes.
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