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Dunlop Grandtrek AT20 vs Dunlop Grandtrek AT25

Dunlop Grandtrek AT20 vs AT25 - Which To Buy? [Test Data]

Here are the key stats for the Dunlop Grandtrek AT20 and Dunlop Grandtrek AT25 tyres, at a glance.
Grandtrek AT20Grandtrek AT25
Vehicle SuitabilityLight Truck / SUVLight Truck / SUV
Driving StyleHighway All-SeasonOn-/Off-Road All-Terrain
SeasonAll SeasonAll Season
Release Date20062011
Run Flat?NoNo
Overall Score67/100N/A

Pricing

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Dunlop Grandtrek AT20 vs Dunlop Grandtrek AT25 in Australia

The Grandtrek AT20 has been around in Australia for about 18 years, whereas the Grandtrek AT25 has been on the market for about 13 years

The Grandtrek AT20 is rated for highway all-season action, however the Grandtrek AT25 tyres are classified as on-/off-road all-terrain. Both tyres are designed for use with 4WDs, SUVs and light trucks.

Both of these are considered all season tyres. Neither of them are runflat tyres. Both brands are considered to be in the premium part of the market.

Read on to see how each of these tyres stack up against each other!

How We Reviewed These Tyres

Unlike the Australian government, the European Union carries out standardised tests on all tyres sold in Europe. These tests are carried out in identical conditions, making them a reliable way to compare tyres.

For this review, we use averaged results from tests done on 13 sizes of these tyres by the European Union.

Fuel Efficiency

EU Grade
(A - E)
Compared to an A grade tyre?
Grandtrek AT20C0.2L/100km extra fuel consumption. ~$55 extra per year
Grandtrek AT25C0.2L/100km extra fuel consumption. ~$40 extra per year

The US Department of Energy estimates that around 25% of the fuel consumption of a vehicle is attributable to the tyres. That's a lot, and it means that choosing fuel efficient tyres can save you quite a bit of money.

The Grandtrek AT20 tyres rank a C on a scale of A to E in the official fuel efficiency tests carried out by the EU (they call these rolling resistance tests).

The Grandtrek AT25 tyres get a grade of C

As their fuel efficiency grade is the same, expect negligible differences in fuel consumption between them.

Here's a graph comparing the Grandtrek AT20 and Grandtrek AT25 tyres for fuel efficiency (1 = Grade E, 5 = Grade A).

Grip & Handling

EU Grade
(A - E)
Compared to an A grade tyre?
Grandtrek AT20D7.5 metre greater stopping distance when braking at 80km/h
Grandtrek AT25D7.5 metre greater stopping distance when braking at 80km/h

We'll now take a look at how these tyres compare in terms of grip and handling.

A good measure of this is 'wet grip', which is an indication of how well the tyres will allow the vehicle to come to a stop in wet conditions.

The Grandtrek AT20 tyres rank a D on a scale of A to E in the official fuel tests carried out by the EU.

The Grandtrek AT25 tyres, on the other hand, get a grade of D.

As their wet grip grade is the same, expect negligible differences in terms of braking distance.

Here's a graph comparing the Grandtrek AT20 and Grandtrek AT25 tyres for wet grip (1 = Grade E, 5 = Grade A).

Noise

EU Grade
(A - C)
Compared to an A grade tyre?
Grandtrek AT20B (71.3 dB)2 times as noisy
Grandtrek AT25B (71.3 dB)2 times as noisy

Another key factor to consider when choosing a tyre is road noise. Once you're over about 40 km/h, the dominant source of noise you hear is from the contact of your tyres on the road.

There is a surprisingly wide variation in the amount of noise each tyre makes.

The Grandtrek AT20 tyres produce 71.3 dB of road noise, which corresponds to a rank of B on a scale of A to C in the standardised testing done by the EU.

On the other hand, the Grandtrek AT25 tyres produce 71.3 dB of road noise, which means a grade of B.

As their noise grade is the same, don't expect many differences in terms of cabin noise.

Here's a visual representation of how the Grandtrek AT20 and Grandtrek AT25 tyres stack up for noise (1 = Grade C, 3 = Grade A).

Comfort

Based on the results of a number of tyre benchmarks, the Grandtrek AT20 scores 4 out of 5 for comfort. We don't have any comfort data for the Grandtrek AT25 tyres.

UTQG Data

Introduced by the National Highway Traffic Safety Administration (NHTSA) in the USA, the Uniform Tire Grading System (UTQG), is a system for comparing one tyre product to another on the basis of some standardised tests.

Grandtrek AT20Grandtrek AT25
Treadwear300
Traction
(AA - C)
B
Temperature Resistance
(A - C)
B

Treadwear

The Grandtrek AT20 tyres have a treadwear rating of 300, which means that they would last 3 times longer than a tyre with a rating of 100. There's no treadwear data available for the Grandtrek AT25 tyres.

Traction

The UTQG system measures traction as straight-line braking in dry conditions. The scale is AA, A, B, C, with AA being the best grade, and C the worst.

The Grandtrek AT20 tyres have a traction grade of B (on a scale of AA, A, B, C). There's no UTQG traction grading data available for the Grandtrek AT25 tyres.

Temperature Resistance

The UTQG temperature resistance tests measure how well tyres can dissipate heat that builds up due to friction with the road. The scale is A, B, C, with A being the highest grade.

The Grandtrek AT20 tyres have a temperature resistance grade of B (on a scale of A, B, C). There's no UTQG temperature resistance grading data available for the Grandtrek AT25 tyres.

Warranty

Unfortunately, we don't have any warranty information available for either of these tyres.

Comparisons With Similar Tyres

Still on the fence about these tyres? Check out how they compare to other similar tyres on the market in Australia!

Summary

Let's now take a look at the main differences between these two sets of tyres.

For fuel efficiency, Grandtrek AT20 score a grade of C, which is more or less average. Grandtrek AT25 end up with a grade of C, which is more or less average.

More important is the wet grip, which gives you an indication of their traction and handling. In this regard, Grandtrek AT20 get a score of D, which is below average. Grandtrek AT25 end up with a grade of D, which is below average.

More important is the wet grip, which gives you an indication of their traction and handling. In this regard, Grandtrek AT20 get a score of B, which is about typical. Grandtrek AT25 end up with a grade of B, which is about typical.

Full Size List (click to show)

Below is a list of all 16 sizes of the Grandtrek AT20, and all 10 sizes of the Grandtrek AT25 tyres sold in Australia, sorted by tyre width.

Grandtrek AT20 Sizes

Size
195/80 R15 96S
205 R16 110R
225/70 R17 108S
225/60 R18 99H
235/70 R16 104S
245/70 R17 108S
245/70 R16 111S XL
245/75 R16 109S
245/70 R17 110S
245/65 R17 111S
255/70 R17 108S
255/70 R16 111T
265/60 R18 110H
265/70 R17 113S
265/70 R16 112S
265/65 R17 112S

Grandtrek AT25 Sizes

Size
205/80 R16 110/108S
255/65 R17 110S
255/65 R17 110H
265/65 R17 112S
265/70 R16 112T
265/60 R18 110H
275/70 R16 114T
275/65 R17 115T
285/65 R17 116H
285/60 R18 116V
Louis from Tyre Geek

Louis

I'm Louis, an engineer passionate about helping Australians choose better tyres for their vehicles!