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Kumho Ecsta SPT Run Flat 225/50R17XL 94W RF B

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*Continental U.S. only.

Part#: 1866313

Section Width : 225mm
Diameter : 17"
Speed Rating : W
Aspect Ratio : 50

  Kumho Ecsta SPT Run Flat 225/50R17XL 94W RF B

Fits On:

All Jeeps (Universal), Universal

Kumho Ecsta SPT Run Flat

Treadwear: 320
Traction: A
Temperature: A
Speed Rating: Z

About the Ecsta SPT Run Flat
A unidirectional UHP tire that provides new tire performance in wet and dry even after the tire is more than half worn. It delivers world class technology by combining grip, handling, comfort, exceptional wear and eye appealing characteristics.

- High dispersion silica expands compound performance envelope for superior wet grip and better treadwear.

- Race proven carcass design with jointless cap plies, wide steel belts, ESCOT carcass profile and high durometer apex delivers razor sharp response and extreme grip without compromising ride quality.

- Three-dimensional lateral grooves optimize water evacuation in footprint.

- Triple tread radius optimizes footprint shape for even pressure distribution.

- Shoulder blocks tilted into direction of travel to improve grip and reduce worn noise.

- Rim Protector in the lower sidewall safeguards wheel against scratches and abrasions.

With a massive manufacturing facility in Macon, Georgia, Kumho has become one of the best recognized names for good value performance tires in North America. With a history that dates back to 1960 Kumho has always pushed the boundaries of tire design and technology. From using eco-friendly materials in the production process to developing and patenting performance optimizing ESCOT technology, they are always one step ahead of the pack. As a company that has a true commitment to performance they are not afraid to show what they have to offer in the motorsports arena as well. They are especially active in grassroots level racing including SCCA and the Porsche Club of America (PCA), but they have also competed on the world stage including the challenging Paris Dakar Rally. With over 50 years of experience in the tire industry Kumho looks forward to a future where they continue to push the industry to new heights.
Q: What different tire types are there, and how do I know which one is best for me? How do I read tire sizes? How do I know which tire size is best for my vehicle?
A: Tires are one of the most important components on any vehicle. They can transform a ride from soft to harsh, improve handling, make your truck off-road competent, or even affect gas mileage. There are numerous different tire types developed for the different styles of driving that people have adopted. The major categories include off road tires or mud &snow tires, all-season tires and high performance tires. There are also tire options that blend the line between these categories. All-season tires are the most prevalent and are designed to work in the biggest array of conditions from dry roads to wet roads to the occasional ice and snow. These are the tires that most commonly come on passenger vehicles and light trucks/SUVs; they usually have the highest tread wear rating so they last the longest and are the most affordable of the groups. Off road tires are designed for more extreme conditions such as loose dirt, mud or deep snow. These are often used by 4x4 enthusiasts and they sometimes require a lift in order to clear the larger more aggressive tread designs. These tires tend to be noisy on the street, and wear out quicker than standard tires, but they really shine when the terrain gets rough. High performance tires are designed to maximize traction and handling for sports cars or performance oriented machines. These tires are rated for higher speed and increased grip but also wear out quicker due to softer compounds, and tend to be worse in the wet than all-season tires. You should choose your tire type based on how you use your vehicle the majority of the time. If you like performance driving you will want a performance tire, but if you commute 90% of the time, a good all-season will be probably be the best choice.

Tires come in a host of different sizes, and the sizing is usually stamped right on the sidewall of the tire. Some off road tires use a format that lists the tire diameter, the tire width and the wheel diameter. For example a 31x10.50x15 would mean the tire is 31” tall, 10.50” wide and fits a 15” tall wheel. More commonly though, tires rely on metric measurements using width, aspect ratio and wheel diameter. A 205/65/14 means that the tire is 205 mm wide, that the distance of the sidewall from the rim lip to the tread face (the aspect ratio) is 65% of the tread width (65% of 205 mm), and it should be mounted on a 14” rim.

In general when choosing a tire it is best to replace your tires with the size that was originally fitted to the vehicle. However, it is often popular to increase tire size in order to gain some added performance be it on or off road. In this case it is crucial to do your homework because a tire that is too tall or too wide will rub and damage the body work as well as hurting the tire itself. If you are planning to run larger wheels it is common to run lower profile tires (smaller sidewall) in order to prevent rubbing and to keep the final drive close to stock and the speedometer calibration the same. Many vehicle manufacturers will list tire sizes that fit your vehicle in the owner’s manual or on their websites. When in doubt it is best to contact the manufacturer directly to find out if a specific tire size will work with your vehicle.

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