Presentation Opti Grip T U E V

Influence Of Mileage On Tire Performances
Test Results Of Summer Tires 225/45 R17 94W
Abstract of Test Report No. 76230122
TÜV SÜD Automotive GmbH

TÜV SÜD Automotive
Project
Description

Objective

The objective of this project was to benchmark 225/45 R17 94W
passenger car summer tires of different makes against each
other during their mileage with special regards to:

Safety on wet and
Durability
dry roads

Some of the properties above were examined on used tires as
well.

TÜV SÜD Automotive GmbH • TÜV SÜD Group


Scope

Durability

Convoy driving over a distance of 30,000 km
(three runs over a 10,000 km distance on public
roads with identical vehicles fitted with the
Tire tread benchmark tire makes)
wear test

NOTE: these “new” tires served as “used”
tires in subsequent tests.



Scope

Safety on wet roads

Measurement of braking distance from 80-20 kph (ABS braking) on:
Braking - wetted asphalt (after 0, 10000, 20000 & 30000 km)
- wetted concrete (after 0 and 30000 km)
Subjective assessment of ride and handling criteria and timed laps on
Handling a wetted handling circuit (after 0, 10000, 20000 & 30000 km)

Aquaplaning Measurement of the transmittable lateral forces when cornering
in corners through a water basin (after 0 and 30000 km)
Aquaplaning Measurement of the aquaplaning speed at 15% slip in a water basin
longitudinal of 9 mm water depth (after 0, 10000, 20000 & 30000 km)



Scope

Safety on dry roads

Braking Measurement of braking distance from 100-5 kph
(ABS braking) on dry asphalt (after 0 and 30000 km)



Test Population

Summer tires 225/45R17 94W

Manufacturer Commercial name Tread design

Goodyear OptiGrip

Continental Sport Contact 3

Michelin Primacy HP

Control tire: new Goodyear OptiGrip



Test Vehicles

VOLKSWAGEN GOLF Mk V 2.0 FSI VOLKSWAGEN GOLF Mk V 1.9 TDI

Specifications of test vehicle used for The wear test was performed with three
tests on wet and dry surface: test vehicles specified as follows:

Body 5-door saloon Body 5-door saloon
Max. Engine power 110 kW / 6000 min-1 Max. Engine power 77 kW / 4000 min-1
Engine type 4 cyl. 2.0l petrol engine Engine type 4 cyl. 1.9l turbo diesel engine, direct injection
Max. Speed 206 km/h Max. Speed 185 km/h
Drive concept front Drive concept front
Max. Engine torque 200 Nm / 3500 min-1 Max. Engine torque 250 Nm / 1900 min-1
Gearbox 6-speed manual transmission Gearbox 5-speed manual transmission
Max. Permissible weight 1890 kg Max. Permissible weight 1910 kg


Test Details
Wear

Key Points

Tires fitted to five identical vehicles driven in convoy
over a total distance of 10,000 km :
• Chassis alignment check & adjustments as needed
• Driver / vehicle rotation every 125 km; tire / vehicle rotation
every 500 km  to ensure same conditions
• Tread wear measured by digital gauge (1/10 mm accuracy)
• Measurement intervals: every 3,350 km;
6 or 7 (Goodyear) spots in the tire„s 4 main grooves and on each
shoulder measured 5 x on each tire (every 72°)
• Tire inflation pressure checked at each tire / vehicle rotation (every 500 km)
– no air loss noted on any of the test tires throughout the test


Test Results
Wear

Expected Lifetime (Average of most worn axle)

55% 60% 65% 70% 75% 80% 85% 90% 95% 100% 105%

Goodyear OptiGrip 100,0%

after 30000 km Michelin 96,9%

Continental 71,6%


Test Details
Performance

General Key Points

• Results show both absolute values measured and % evaluation
in comparison to the average performance of all tires in the test.

• Results of tread wear test (exp. Lifetime) are subject to linear extra-
polation (based on wear between 0 and 30,000 km in the most worn
groove of the average of axle of each brand)

• Relative performance:
performance compared to average performance of all tires in the test
- value above 100 % = better
- value below 100 % = worse


Test Details
Wet Braking

Key Points

• Test vehicle equipped with vehicle speed measurement equipment

• One tire make selected as control tire / re-tested at end of each
complete sequence  to consider potential changes of test
conditions (e.g. temperature)

• Deceleration on artificially wetted asphalt and concrete

• Relevant factor for result: stopping distance

• Minimum of 8 validated runs for each tire

• Mean deceleration calculated based on 8 values


Results On
Wet Surface

Braking performance on wet surface, new / used tires (lowµ)

lowµ 65% 70% 75% 80% 85% 90% 95% 100% 105%

Control tire = new Goodyear OptiGrip 100,0%
new Michelin 90,4%
Continental 96,4%

Continental 95,1%

Continental 86,7%

after 30000km Michelin 75,6%
Continental 73,0%


Results On
Wet Surface

Braking performance on wet surface, new / used tires (highµ)

highµ 70% 75% 80% 85% 90% 95% 100% 105%

new Michelin 99,4%
Continental 100,0%

after 30000km Michelin 92,6%
Continental 80,2%


Test Details
Aquaplaning Long.

Key Points

Test vehicle equipped with vehicle speed measuring system and
rotation wheel spin sensors on both front wheels
• Driving: The vehicle is driven with constant speed into a flooded water
basin with an approximate water depth of 9 mm.
One side of the vehicle is running on dry asphalt the other side runs
through the flooded segment.
• Test: Acceleration with full throttle when entering the water basin.
Speed and wheel spin are recorded. The corresponding vehicle speed
to a wheel spin difference of 15% represents the aquaplaning speed.

• Aquaplaning longitudinal: Characterized by maximally reached
aquaplaning speed. Four valid runs in same gear.


Results On
Wet Surface

Aquaplaning longitudinal ability, new / used tires

65% 70% 75% 80% 85% 90% 95% 100% 105%

new Michelin 95,7%
Continental 96,7%

Continental 89,9%

Continental 87,0%

Continental 79,8%


Test Details
Aquaplaning Corn.

Key Points

Test vehicle equipped with vehicle speed measuring
equipment and lateral acceleration sensor

• Driving: Constant speed & steering angle on dry asphalt
(circle with app. 20 m segment flooded water)

• Test: Lateral acceleration and speed recorded when vehicle enters
flooded segment (light barrier); vehicle speed is increased run by run
until clear decrease of lateral acceleration occurs

• Aquaplaning in corners: Characterized by maximally transmittable
lateral acceleration as well as drop after reaching max (the flatter
the gradient the easier to control)


Results On
Wet Surface

Aquaplaning in corners ability, new / used tires

50% 60% 70% 80% 90% 100% 110%

new Michelin 92,3%
Continental 95,4%

Continental 61,7%


Test Details
Wet Handling

Key Points

Subjective assessment of handling & ride by experienced test
drivers on special, artificially wetted handling circuit (asphalt):
• Driving at and beyond vehicle„s stability limit (ESP off / ABS on)

• Avoidance of excessive under- / oversteer while driving at stability
limit (striving for maximum reproducibility)

• Lap times recorded and average speed calculated from lap time
and track length

• Use of 10-point scale for different performance criteria
 one overall evalution score


Results On
Wet Surface

Handling ability on wet surface, new / used tires

65% 70% 75% 80% 85% 90% 95% 100% 105%

new
Michelin 96,9%
Continental 98,6%

after 10000 km
Michelin 94,9%
Continental 95,0%

after 20000 km
Michelin 93,0%
Continental 89,1%

after 30000 km
Michelin 90,3%
Continental 83,1%


Test Details
Dry Braking

Key Points

• Test vehicle equipped with vehicle speed measurement equipment

• One tire make selected as control tire / re-tested at end of each
complete sequence  to consider potential changes of test
conditions (e.g. temperature)

• Deceleration on dry asphalt

• Relevant factor for result: stopping distance

• Minimum of 8 validated runs for each tire

• Mean deceleration, calculated based on 8 values


Results On
Dry Surface

Braking performance on dry surface, new / used tires

95% 100% 105%

new
Michelin 99,0%
Continental 99,9%


after 30000 km
Michelin 102,4%
Continental 100,1%


Presentation Opti Grip T U E V

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