How Pirelli is testing 2026 F1 tyres without 2026 cars

Pirelli has entered the following stage of getting ready its smaller tyres for the 2026 Components 1 season, with Ferrari and McLaren testing its tougher compounds in Barcelona this week.

A lot of attention has gone to Lewis Hamilton continuing his preparations with his new Italian employer alongside team-mate Charles Leclerc and McLaren’s Lando Norris, nevertheless it can’t be pressured sufficient that lap instances from the two-day take a look at on the Circuit de Barcelona-Catalunya are solely meaningless – closely relying on the run programmes requested by Pirelli to check its smaller prototype tyres for 2026 and its compounds on the tougher finish of the dimensions.

Whereas Hamilton can have benefited from extra seat time in a Ferrari from final 12 months, with the newest procedures, steering wheel, Ferrari energy unit and so forth, the largest benefactor from the take a look at is Pirelli itself. The Italian tyre producer is up towards it to check and produce tyres which can be narrower – 25mm on the entrance and 30mm on the rear – and smaller in diameter, from 720mm to 705mm-710mm entrance to rear, for use on vastly completely different vehicles subsequent 12 months.

The issue for Pirelli is that it has no consultant vehicles to check its new rubber on because the 2026 vehicles characteristic considerably lowered drag and fewer downforce generated by the ground and diffuser.

Preliminary plans to scale back total downforce by 40 p.c have been watered all the way down to round 15 p.c following issues over slower lap instances, which at the moment are anticipated to be extra in step with present efficiency ranges. However the brand new technology of vehicles are considerably completely different in how and the place they generate efficiency, so Pirelli has to depend on the imperfect answer of mule vehicles – equipment from 2022-2024 with trimmed wings – to gather real-life knowledge from its new rubber.

Following an preliminary take a look at with Aston Martin in September – in its 2022 mannequin – and up to date wet-compound operating at Le Castellet, Ferrari and McLaren performed work in Barcelona in newer vehicles with considerably decrease wing ranges, showing with totally flat mainplanes extra akin to one thing one would see in Baku or Las Vegas relatively than on the high-downforce Montmelo circuit.

Charles Leclerc, Ferrari SF-24 throughout Pirelli take a look at

Picture by: Pirelli

The general downforce ranges of those mule vehicles will likely be comparatively near the start-of-2026 specs, however as a result of the vehicles are so completely different it’s nonetheless troublesome for Pirelli to appropriately reproduce the masses its tyres will likely be subjected to. It’s due to this fact counting on being often fed simulations from groups to remain forward of the curve.

“The primary checks have been primarily devoted to grasp how the mule vehicles are working, as a result of clearly they’re completely different,” Pirelli’s motorsport chief Mario Isola advised Autosport. “The one factor we will do is to constantly ask for up to date 2026 simulations from the groups, mainly. We should replace our know-how and replace our building based on the information that we obtain.

“We can’t simply depend on the mule vehicles as a result of it received’t be wise, and we are going to proceed to supply them a digital mannequin of the tyre to make use of of their simulators they usually come again to us with their suggestions. And that is the best course we must always proceed in.”

Each decreasing downforce total and altering how it’s generated can have a significant impression on the character of the masses 2026’s smaller tyres are going to be subjected to. For Pirelli it’s due to this fact essential to get the inner building of its new tyres in the best ballpark. Any additional fine-tuning can then be completed by way of tweaking the compounds.

The Italians aren’t simply taking anticipated 2026 efficiency into consideration, as F1 squads all the time have a tendency to seek out fast good points in the beginning of a laws cycle, and Pirelli due to this fact has to have sufficient headroom to account for larger tyre masses additional down the road.

One vital problem added to the combo is the upcoming X-mode, a DRS-like type of energetic aerodynamics which modifications the angle of the entrance and rear wings on the straights for larger prime speeds, versus the usual configuration which is dubbed Z-mode.

“We can’t generate these downforce ranges with the X-mode and Z-mode, it’s inconceivable,” Isola defined. “So, we’ve got to grasp what one of the best compromise for testing is and after we attempt to correlate the information from simulations with knowledge collected on observe. Step one is to outline the profile and building. From the take a look at we had with Aston Martin we’ve got an excellent start line, I’d say. Compound growth is the second step.

Mario Isola, Racing Supervisor, Pirelli Motorsport

Picture by: Mark Sutton / Motorsport Pictures

“We all know that it’s a problem, as a result of in any case groups don’t need to lose any efficiency in comparison with the present vehicles, and the tyres are smaller, with decrease loading capability and so forth. We’re additionally once more testing new supplies and new concepts so as to have a tyre that isn’t heavier however nonetheless capable of maintain the load and to maintain the identical efficiency that the present tyres have.”

It’s not the primary time Pirelli has been chasing a transferring goal with one hand tied behind its again. However Isola identified the problem for 2026 was maybe barely simpler than in 2017, when F1 moved to larger and wider vehicles with rather more downforce, which on the time was inconceivable to copy with a mule automotive. F1’s transfer to ground-effect primarily based vehicles for 2022 was additionally a difficult proposition.

“It is a very comparable state of affairs to what we had for 2017 and 2022 after we needed to develop an entire new tyre for an entire new automotive, so it is not one thing new to us,” Isola mentioned in an earlier roundtable.

“In 2016 it was tremendous troublesome as a result of it was anticipated to have vehicles with a lot larger downforce and the efficiency was 5 or 6 seconds faster than the earlier 12 months, so it was inconceivable to copy this type of efficiency.

“However the way in which you obtain the load with the present vehicles is totally completely different in comparison with the brand new one, for instance. And on the straights, we’ve got a variety of load now, whereas in 2026 at excessive pace we must always have much less load. So, the comparability will not be the identical.”