"10 Answers to Your Questions About Run Flat Tyres"
"Hankook Tyres Derby, Tyres Derby (750+ words)"
[ "10 Answers to Your Questions About Run Flat TyresRun Flat Tyres Derby (also known as Self Supporting or auxiliary tyres) are pneumatic tyres that can be driven for some distance even when they are punctured, deflated or lack pressure. There is a unique reinforced structure under the tyre's tread area, which will keep the tyre inflated and stiff despite there being no air in it. With this special construction, users can still drive 50 km to 80km on their alloy wheels (depending on your vehicle model)The technology was designed specifically for cars with low ground clearance like sports cars, where changing tyres could get very costly if they were required to lift the car using a jack etc. It was also developed for higher-performance cars which could be in jeopardy in a puncture.Can I run-flat tyres on all four wheels?;No, it is impossible to fit both front and rear Tyres with the technology. Only one axle can feature this technology either the front or back pair of tyres. If you were to put run-flat tyres on all four wheels, only two tyres would support the weight of your vehicle (if they both get punctured) leaving two standard road-legal tyres at the rear for emergency braking etc. This might become dangerous if you require more than 50 km after a puncture and had no means of replacing your tyre(s).How do I know if I need run flats?;If you have a car that has the potential to lift the front or rear tyre in case of a puncture, it is likely to be fitted with run-flats. The tyre pressure monitors installed in your vehicle will warn you about low tyre pressure in any tyre, which would be an indication.Will my fuel economy drop?;No, there is no impact on your vehicle's performance and its fuel economy from this change. This is because the car alternator supplies power for your auxiliary battery to maintain the air level even if they are punctured/deflated or running on flat spots etc.Are flat tyres more expensive than standard tyres?;They might cost slightly more at the time of purchase but run-flats are considered more durable and user friendly.Can I drive with a puncture using this technology?;No, It is not possible. The tyres must have pressure in them for the particular reinforced structure to work properly under low ground conditions i.e your car might get stuck if you were to attempt it anyway. If you do need to replace your tyre(s) on the road, bring along an air pump and add some air into your new flat-free tyres until such a time as they can be switched out for regular new ones (s).Can I fix my punctured tyre at home?;You can't - There is no way of fixing the tyre using jack and patch repair. You will need to replace the tyre and a trained tyre technician should do this to make sure that the new one is properly seated and inflated according to manufacturer specifications (if you don't have run-flats, there are DIY options).Can I use my spare tyre when using run-flat tyres?;No, you cannot use your spares because it does not have a reinforced structure built into them. In case of a puncture, you must get it replaced immediately by an authorised dealer/retailer wherever possible or else drive on your alloy wheels until you can reach a garage for maintenance.Are these tyres legal in all countries?;All EU Countries have been approved as road-legal so if you have run-flats in the UK onwards you are good to go.In the United States, flat Hankook Tyres Derby on light trucks and vans must comply with FMVSS 109 and be placed on the vehicle as unsafe for highway use. However, on 31 August 2011 NHTSA granted an exemption to some manufacturers so they can sell a limited number of these vehicles without the restriction until more testing is done.Vehicles that have been exempted from this rule include:Chevrolet/GMC pickup trucks, Dodge Ram 1500 4x4s, Jeep Wrangler Unlimited 4WD models, Chrysler Aspen 4WDs and Dodge Durango SUVs. They also allow certain commercial fleet owners to purchase new or used exempt vehicles temporarily but it's at the discretion of the Department whether they allow it or not." ]