4x4 Tires
4x4 Tire Guide and Basic Tire Knowledge
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4x4 Tires
2 Content Performance requirements Technical info Application guide Market segmentation SUV and 4x4 evolution OE sizes of Goodyear on Jeep vehicles For selected markets: Why you need winter tires
4x4 Tires
Where to get more information:
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www.goodyear.com
4x4 Tires
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4x4 Tire Performance Requirements Cushioning/Comfort
Braking Side stability
Acceleration
Load carrying capacity Cushioning ability Torque transmission Steering response Road holding ability Traction on all surfaces (road, mud, grass, gravel, sand, snow, ice) Durability Out-of-rut grip Adherence Side protection Puncture resistance
Steering response
4x4 Tires
7 Tire Markings
4x4 Tires
How to read your tire’s sidewalls •
Example: Goodyear Wrangler HP AW 245/60 R 18 105 H Tire brand
Product name Tire width Tire height
Wheel diameter inch
Load index
Speed index
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4x4 Tires
Speed and load index on tires Speed index:
Load index:
• • • • • • • • •
• • • • • • • • •
Q = 160 km/h R = 170 km/h S = 180 km/h T = 190 km/h U = 200 km/h H = 210 km/h V = 240 km/h W = 270 km/h Y = 300 km/h
100 = 800 kg 101 = 825 kg 102 = 850 kg 103 = 875 kg 104 = 900 kg 105 = 925 kg 106 = 950 kg 107 = 975 kg 108 = 1,000 kg
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4x4 Tires
Best Practices
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Dimension Dimension • Off road : a taller tire for increased ground clearance and vehicle angles. • Do not excessively increase external tire diameter to keep the center of gravity down. • Tire width should not extend outside wheel arches or contact suspension components on full lock. • An increased diameter reduces braking capability without brake tuning. • Large tires demonstrate more flotation capability on soft grounds. • Tire traction increases with tire width. (except in snow!) Inflation Inflation On road: under inflation : the worst enemy ! (premature wear,excessive heat..) Follow the Jeep recommended tire pressure ! For all sizes different to original size, follow tire manufacturers recommendation. Off road: - 10 % on rough terrain - 50 % on loose ground with low speed to prevent ploughing . - 25- 45% improves sand flotation. - > 50% : not recommended (no traction gain / tire structure fatigue) IMPORTANT: When back on the road, immediately correct tire pressure! Regular Regularcheck check Regular check : a 4x4 tire is designed to provide performance and safety !
4x4 Tires
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A Comprehensive Range for SUV and 4x4 ...
On OnRoad Road
Wrangler F1
Winter Winter On OnRoad Road All Season All Season
HP AW Vector 4seasons
Off Off Mixed Mixed
Wrangler AT/R
Wrangler MT/R
Wrangler Ultragrip
Ultragrip SUV
4x4 Tires
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… For each customer need Asphalt
Dirt
Mud
Snow
Ice
Sand
Wrangler F1 On Road High Performance On Road All Season
Mixed
Off Road
Winter
Wrangler HP All Weather
Wrangler AT/R
Wrangler MT/R
Wrangler UG Ultragrip
Most suitable
Suitable
Possible
4x4 Tires
For selected markets: The need for winter tires!
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4x4 Tires
Off-Road tire segmentation
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Road
Road
Winter
Winter
Summer
Mixed (AT)
Off Road (MT)
Off Road
4x4 Tires
Winter
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4x4 Tires
Why do 4x4 vehicles need winter tires?
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4x4 Tires
A 4x4 vehicle has better traction on slippery surfcaces, but NOT when braking !
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4x4 Tires
Winter tires for 4x4 vehicles Typical tread pattern Summer tire
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Typical tread pattern Winter tire
Sipes
Wrangler AP
Wrangler UG
4x4 Tires
24 Why are sipes so extremely important in winter?
• • • • •
The weight of the vehicle causes a thin waterfilm on icy roads. That is, why the ice is so extremely slippery. The microscopically small sipes are building multiple grip edges, which cut into the waterfilm. The same happens on wet asphalt. And the sipes are also giving better traction on snow. Rule of thumb: The more sipes, the better a tire is on snow, ice and wet roads. Only drawback: Since the tire is much softer, because of less stable tread pattern blocks, there is less traction and control on dry and hot roads in summer.
4x4 Tires
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Winter Performance of different 4x4 tire types Winter tire
„All season tire“
Summer tire
All-Terrain-tire
Mud-Terrain-tire
4x4 Tires
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Traction on Snow (Zugkraft (N Pneu de Inverno
Winterreifen
Pneu AT
AT-Reifen
3116
Pneu 4 estações
Ganzjahresreifen
3115
Pneu MT
MT-Reifen
3064
Pneu de Verão
Sommerreifen
5170
2707 0
1000
Source: AutoBild AllesAllrad Nr.2, February 2005
2000
3000
4000
5000
6000
4x4 Tires
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Braking distance on snow from 50km/h Bremsweg (m) aus 50km/h Pneu de Inverno
Winterreifen
Pneu AT
AT-Reifen
Pneu de Verão
Sommerreifen
47.5
Pneu 4 estações
Ganzjahresreifen
48.1
Pneu MT
32.8 44.0
50.0
MT-Reifen 0.0
10.0
20.0
30.0
40.0
50.0
When the vehicle comes to a full stop on winter tires, the same vehicle on MT tires is still driving at a speed of 30km/h Source: AutoBild AllesAllrad Nr.2, February 2005
60.0
4x4 Tires
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Handling on snow, average speed (km/H) Durchschnittsgeschwindigkeit (km/h) Pneu de Inverno
Winterreifen
Pneu AT
AT-Reifen
Pneu MT
MT-Reifen
Pneu 4 estações
Ganzjahresreifen
42,4
Sommerreifen
42,0
Pneu de Verão
53,4 47,7 45,1
0,0
10,0
Source: AutoBild AllesAllrad Nr.2, February 2005
20,0
30,0
40,0
50,0
60,0