Pirelli could shelve prototype soft Formula 1 tyre for 2016
Pirelli has conceded to difficulties with its prototype tyre that could result in it not being introduced into Formula 1 as planned later this year
The Italian manufacturer opted to develop a new soft compound to make it more resistant to impacts with external objects, such as kerbs.
In practice at Spa and Monza over the last week drivers have been running on the unmarked prototype tyre to assess it.
But Pirelli racing manager Mario Isola has revealed the feedback from Spa was not overwhelmingly positive.
"There were two main areas - one was the pulling," said Isola.
"Considering the construction we were expecting a pulling on the left from the rear tyre, so we wanted to investigate this effect.
"It is a natural force of the tyre, and some cars felt the effect and some cars didn't.
"The other strange behaviour that was reported from Spa was a loss of grip compared to the current soft specification.
"This is really strange because although there is a change to the construction, the compound is the same. I cannot explain why they felt less grip."
Isola also revealed there was a difference in lap time, with one team claiming it was 0.8 seconds slower per lap with the prototype compared to the current soft tyre.
"Spa is a long lap with a lot of corners, so the lap time is quite high compared to other circuits," added Isola.
"We need to quantify this difference, and if it is very small then I don't see a reason why we shouldn't introduce it.
"If the difference is big then there is an effect we are not considering and we need to better understand why we have this difference in grip before introducing the tyre."
Pirelli will now assess the feedback from the teams and drivers following practice in Italy before compiling a report and sending it to the FIA.
A decision will then be taken on whether to introduce it for the Malaysian Grand Prix at the start of October.
"We need to be quite quick with this because if the prototype is OK then we want to introduce it in Sepang, but this means we have to produce, deliver and ship the tyres, so we need to conclude quickly and decide what to do," said Isola.
"We will consider all the effects, and then we will discuss with the FIA whether it is worth introducing or not.
"If we want to introduce it later it means we won't have an additional test, so probably if we don't introduce it in Malaysia then I am not sure we will introduce it for this year.
"If we want to introduce it in Malaysia it means that next week we need to have all the data available, and then we will take a decision. It needs to be done by the end of next week."
Be part of the Autosport community
Join the conversationShare Or Save This Story
McLaren's Alonso sure some F1 teams will get new rules wrong
Formula 1 peaked in 2000s, not Senna/Prost era, Alonso believes
How Hamilton has battled his own mentality
How MotoGP brakes work: Secrets of stopping a 220mph bike
Hyundai enacts contingency plan after WRC Kenya fuel issue
Vanwall working on 2025 WEC comeback with heavily-revised Hypercar
Russell: Mercedes locked in F1 "battle of fine margins"
Why F1 2026 worst case fears could be key to new rules success
How the F1 driver market situation sits for each team with 2025 openings
What's been going wrong for Leclerc in F1's tiny margins qualifying game
What the Chinese GP's highlights reveal about its first F1 race for five years
Subscribe and access Autosport.com with your ad-blocker.
From Formula 1 to MotoGP we report straight from the paddock because we love our sport, just like you. In order to keep delivering our expert journalism, our website uses advertising. Still, we want to give you the opportunity to enjoy an ad-free and tracker-free website and to continue using your adblocker.
Top Comments