The tyre transition: Verifying the balance between EV range and road grip
Michelin allowed its latest EV-focused car tyre to be put to the test around the challenging Porsche Experience Centre Silverstone tracks. By Simon Harris.
The tyre transition: Verifying the balance between EV range and road grip
Michelin allowed its latest EV-focused car tyre to be put to the test around the challenging Porsche Experience Centre Silverstone tracks. By Simon Harris.
For fleet managers, tyre selection has long been a calculation of compromise. The emergence of electric vehicles has intensified this challenge. The heavier weight and high instant torque of electric cars accelerate tread wear, while the relentless drive to maximise battery range pressures fleets to fit low rolling resistance rubber. The historical trade-off is well known. Lower the rolling resistance to gain miles, and you generally reduce wet-weather braking performance and driver feel.
Michelin’s new Primacy 5 Energy range arrives with a definitive industry benchmark, holding a ‘Triple A’ European labelling rating across efficiency, wet grip and noise. The manufacturer claims this new variant delivers up to 10% more driving range per charge alongside a lifespan that outlasts direct premium competitors in the touring segment by up to 40%.
To evaluate whether these laboratory claims translate into predictable performance on the tarmac, we took a Cupra Born fitted with the new rubber onto the handling circuits at the Porsche Experience Centre in Silverstone.
The physics of the track evaluation
Evaluating an efficiency-focused touring tyre immediately after driving its performance-orientated sibling, the Pilot Sport 5, provides an instant lesson in physics.
Unsurprisingly, the Primacy 5 Energy does not possess the outright, lateral cornering grip of dedicated sports rubber when pushed hard into a bend. The eco-focused compound is engineered to roll easily, meaning that drivers attempting spirited cornering on a circuit will find the limits of adhesion much sooner than they would on a performance tyre.
However, racetrack lap times are irrelevant to everyday fleet operations. What matters to fleet managers for their drivers is predictability under duress, and this is where the tyre proved its engineering. Across a rapidly changing mix of surfaces, including a specialised, ice-smooth low-friction handling section, the tyre remained exceptionally surefooted.
Even when deliberately forced past its grip threshold to break traction, the breakaway was progressive rather than sudden. The car remained highly controllable, providing a level of steering feedback that allows a driver to catch a slide easily. For an everyday driver facing a sudden emergency swerve or a patch of surface flooding, this predictability is far more valuable than high-speed cornering limits.
What matters to fleet managers for tyres is predictability under duress
Weighing up the compound engineering
The challenge for any tyre manufacturer trying to score an A-rating for both rolling resistance and wet braking comes down to chemistry. Michelin has utilised a new blend of resins and elastomers in the compound, alongside a thinner belt structure beneath the tread, to minimise heat build-up as the tyre deforms against the road. Less heat equates to less wasted energy, directly protecting the vehicle’s battery range.
Crucially for operating budgets, this compound layout also aims to tackle the accelerated tyre wear typical of heavy EVs. While Michelin’s claims of up to 40% greater longevity over its rivals are based on specific independent testing loops, the true test will be how the rubber handles the varied, abrasive road surfaces and route cycles of real-world fleet operations. Many fleets and their contract hire providers will be watching closely to see if these wear projections hold true across standard three- to four-year operating cycles.
The total cost of ownership equation
For fleet managers and their contract hire providers, track performance metrics must ultimately square with running costs. While fuel or electricity consumption figures dominate efficiency debates, the true financial impact of an electric vehicle tyre is often decided by its replacement frequency.
Tyres represent a significant slice of a vehicle’s ongoing operational cost, and the labour and downtime required to repeatedly pull an electric car off the road for fresh rubber can quickly increase costs. This is where long-term lifecycle monitoring becomes critical. Even the most impressive laboratory wear projections can fluctuate wildly once subjected to the daily realities of varied driving styles, heavy payloads and abrasive urban delivery routes. For operators looking to control their lifecycle costs, the potential financial gains of this new compound will remain a theoretical calculation until the rubber undergoes extended, real-world duty cycles across public roads.
The bottom line
Our track assessment indicates that Michelin has managed to smooth out the sharpest edges of the traditional eco-tyre compromise. The Primacy 5 Energy will not transform an EV into a performance car, but it does not pretend to. Instead, it offers a highly stable, predictable platform in low-friction conditions, suggesting that fleets can pursue vital range extensions without compromising basic vehicle safety and driver reassurance.
