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Michelin Primacy 3 ST vs Michelin Primacy 4 ST

Michelin Primacy 3 ST vs 4 ST - Which Is Better? [Test Data]

Here are the key stats for the Michelin Primacy 3 ST and Michelin Primacy 4 ST tyres, at a glance.
Primacy 3 STPrimacy 4 ST
Vehicle SuitabilityPassengerPassenger
Driving StylePremium Touring SummerPremium Touring Summer
SeasonSummerSummer
Release Date20132019
Run Flat?NoNo
Overall ScoreN/AN/A

Pricing

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Michelin Primacy 3 ST vs Michelin Primacy 4 ST in Australia

The Primacy 3 ST has been around in Australia for about 11 years, whereas the Primacy 4 ST has been on the market for about 5 years

Both tyres are rated for premium touring summer action. Both tyres are designed for use with regular passenger (non-SUV) vehicles.

Both of these are considered summer 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 6 sizes of these tyres by the European Union.

Fuel Efficiency

EU Grade
(A - E)
Compared to an A grade tyre?
Primacy 3 STC0.2L/100km extra fuel consumption. ~$48 extra per year
Primacy 4 STC0.2L/100km extra fuel consumption. ~$43 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 Primacy 3 ST 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 Primacy 4 ST 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 Primacy 3 ST and Primacy 4 ST tyres for fuel efficiency (1 = Grade E, 5 = Grade A).

Grip & Handling

EU Grade
(A - E)
Compared to an A grade tyre?
Primacy 3 STB2.5 metre greater stopping distance when braking at 80km/h
Primacy 4 STB2.5 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 Primacy 3 ST tyres rank a B on a scale of A to E in the official fuel tests carried out by the EU.

The Primacy 4 ST tyres, on the other hand, get a grade of B.

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

Here's a graph comparing the Primacy 3 ST and Primacy 4 ST tyres for wet grip (1 = Grade E, 5 = Grade A).

Noise

EU Grade
(A - C)
Compared to an A grade tyre?
Primacy 3 STB (71.0 dB)2 times as noisy
Primacy 4 STB (68.8 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 Primacy 3 ST tyres produce 71.0 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 Primacy 4 ST tyres produce 68.8 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 Primacy 3 ST and Primacy 4 ST tyres stack up for noise (1 = Grade C, 3 = Grade A).

Comfort

We don't have any comfort data for either of these 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.

Primacy 3 STPrimacy 4 ST
Treadwear340
Traction
(AA - C)
A
Temperature Resistance
(A - C)
A

Treadwear

The Primacy 3 ST tyres have a treadwear rating of 340, which means that they would last 3.4 times longer than a tyre with a rating of 100. There's no treadwear data available for the Primacy 3 ST 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 Primacy 4 ST tyres have a traction grade of A (on a scale of AA, A, B, C). There's no UTQG traction grading data available for the Primacy 3 ST 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 Primacy 4 ST tyres have a temperature resistance grade of A (on a scale of A, B, C). There's no UTQG temperature resistance grading data available for the Primacy 3 ST tyres.

Warranty

The Primacy 3 ST tyres have a warranty of 6 years, whereas the Primacy 4 ST tyres have a warranty of 6 years.

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, Primacy 3 ST score a grade of C, which is more or less average. Primacy 4 ST 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, Primacy 3 ST get a score of B, which is above average. Primacy 4 ST end up with a grade of B, which is above average.

More important is the wet grip, which gives you an indication of their traction and handling. In this regard, Primacy 3 ST get a score of B, which is about typical. Primacy 4 ST end up with a grade of B, which is about typical.

The Primacy 3 ST have a warranty of 6 years, while the Primacy 4 ST tyres are guaranteed for 6 years.

Full Size List (click to show)

Below is a list of all 9 sizes of the Primacy 3 ST, and all 35 sizes of the Primacy 4 ST tyres sold in Australia, sorted by tyre width.

Primacy 3 ST Sizes

Size
205/65 R15 94V
205/50 R17 93W XL
215/55 R17 94V
225/55 R18 102V XL
225/55 R17 101W XL
225/60 R16 98W
235/45 R18 94V
235/50 R18 97W
245/45 R18 100Y

Primacy 4 ST Sizes

Size
195/55 R16 91V
195/65 R15 91V
205/65 R16 95V
205/50 R17 93W
205/55 R16 91W
205/60 R16 92V
215/55 R16 97W
215/45 R17 91W
215/60 R16 99V
215/60 R17 96V
215/50 R17 95W
215/45 R18 93W
215/55 R18 99V
215/55 R17 94V
225/60 R16 98W
225/50 R18 95V
225/60 R17 103V
225/45 R18 91W
225/45 R18 95W
225/55 R16 99W
225/55 R17 101W
225/50 R17 98W
225/45 R17 94W
225/55 R18 102V
235/45 R17 97W
235/50 R18 97W
235/60 R16 100V
235/55 R17 103W
245/45 R18 100W
245/45 R19 102V
245/50 R18 100W
245/45 R19 102W
245/45 R17 99W
255/45 R17 98W
255/45 R18 99W
Louis from Tyre Geek

Louis

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