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Tires at the 6 Hours of Spa

Michelin previews the Spa round of the FIA WEC, detailing its compound choices, as well as the introduction of RFID tire tags


Submitted by: Michelin motorsport


Michelin’s pre-season development programme allowed it to make a number of significant improvements to its range of endurance racing tires, with the accent on improving their longevity following the introduction of quota restrictions for LM P1 and LM GTE Pro teams competing in the 2017 FIA World Endurance Championship.

This was achieved with no detriment to the tires’ other performance-related qualities, as confirmed by the results of the six tests organised with its WEC partners since last July. Even so, two things remained to be checked this season; the ability of its new tires to climb quickly to their ideal working temperature in cold weather, as well as their versatility in shifting conditions.

The first of these boxes was ticked off at April’s 6 Hours of Silverstone. “In endurance racing, the teams use warmers to bring their tires up to temperature,” explains Jérôme Mondain, the manager of Michelin’s endurance racing programmes. “However, the treads have time to cool down during pit stops before they are actually fitted to the cars. The out laps can consequently be a little delicate for the drivers who want to find their markers as soon as they can. Also, when a race is interrupted, tire temperatures can fall very quickly, especially in cold weather. That is when you really need them to be capable of reaching their working temperature again as fast as possible. At Silverstone, we saw that this property hasn’t been affected at all by their extended longevity. Our tires are competitive by the time the car exits the pit lane or very quickly when action resumes after an interruption.”

At the 2017 FIA WEC’s second round at Spa-Francorchamps, Michelin will be looking to evaluate another key feature, namely the versatility of its tires and their ability to deliver consistent performance across a broad spectrum of track temperatures.

The weather in Belgium’s Ardennes Mountains can be extremely changeable at this time of year, and the temperature can fluctuate significantly between when the sun is out or concealed by a cloud. True, the 2016 race was marked by exceptionally hot air and track temperatures of around 25°C and 35°C respectively, but this weekend’s conditions are expected to be more in-line with traditional values.

“The work we aim to do at Spa to optimise our tires’ temperature windows is basic groundwork for June’s Le Mans 24 Hours,” adds Mondain. “If we get a mixed bag of weather, it will enable us to work closely with our different partners to fine-tune our range. At this year’s six-hour races, getting tire choice right promises to be even more critical than ever since teams are now only authorised to use four sets each. Errors are therefore likely to be very costly. Our role is to advise them and the data we collect will help our technicians to provide the best possible service.”

Also at Spa, a new RFID chip tire-identification system is being tested for the first time. This system enables tires to be monitored individually. For spectators, it will be possible to follow the teams’ respective strategies at Le Mans in real time and understand what is happening during pit stops which are such a fundamental feature of endurance racing. At Spa, however, this information will not be made available to the general public.

LM P1 (31/71-18)
Michelin’s range for LM P1 prototypes consists of three types of tire: slicks, a ‘hybrid’ tire and two wet weather tires.
This year, the appellation of Michelin’s slicks is based on their compound, namely Soft, medium, and hard.

Porsche LMP Team and Toyota Gazoo Racing use bespoke tires developed to match the specific characteristics of their respective cars.

The Michelin Hybrid was introduced to replace the more conventional intermediate tire for the first time in 2012. Its revolutionary compound means this pattern-less solution can be used in damp and drying conditions. Michelin’s wet weather options are a Wet and a Full Wet. Tire allocation for the 6 Hours of Spa (qualifying and race): four sets of four tires, plus two spares.

LM GTE (front: 30/68-18 / rear: 31/71-18)
Like its LM P1 tires, Michelin has reverted to using the type of compound to distinguish between its slick tires (Soft, Medium, and Hard).

Following extensive work on the compounds of its tires for LM GTE cars, Michelin dropped the use of intermediate tires for this class some years ago.

Michelin’s wet weather options for LM GTE cars are a Wet and a Full Wet. The FIA World Endurance Championship requires LM GTE Am teams to fit tires designed for the LM GTE Pro cars in 2016.

Tire allocation for the 6 Hours of Spa (qualifying and race): four sets of four tires, plus two spares.



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