Special rules apply to studded tyres: – the studs shall be solid, cylindrical and flatcut, cross section of the studs must form a full circle at every point, studs are not allowed to be tubular, body of the stud must be homogenous and must not form a tube or hole, maximum diameter of the flange is 9mm, while minimum diameter of the metal core in the middle, length of the stud is limited to 20mm and weight to 4grams, must be mounted from the outside and studs must not exceed 20 per decimeter of the wheel circumference.Ĭommon tyre rules: 60.1.2 All cars must be fitted with moulded tyres.
#TOP RALLY DRIVERS DRIVERS#
So what are the tyre models that WRC drivers can use? Michelin SA dry tarmac tyre 20/58–15 SA22 – 20 = tread band width (in cm) – 58 = exterior diameter of the tyre (in cm) – 15 = rim diameter (inches) – SA = thread type (tyre model) – 22 = compound type, in this case medium (00 = soft, 20=medium, 30=hard, 031B super soft) What do these numbers on the rally tyre mean? On regular cars measurement are in form of 195/50/15 81V (width/profile/tyre size/load size/speed index) With rally cars it’s a bit different, let’s take an example:
#TOP RALLY DRIVERS DRIVER#
For a given rally, all tyres used by a driver must come from the same tyre supplier. (update: in 2018 also Pirelli as the official partner of the FIA Junior WRC Championship). There are two nominated manufacturers for WRC 2017 season: Michelin and DMACK. Soft tyre will offer maximal grip, but will wear quicker. In general, hard tyres are used when the temperatures are high (usually above 22☌) and soft tyre when it’s colder (0–10°c), while a super soft option is for sub freezing temperatures, used in Rally Monte Carlo. So they need a tyre for each of the conditions, while these need to be adjusted also on the conditions - surface temperature, where there are 4 options: super soft, soft, medium, hard.
In season 2017 there are 13 events, from which 8 are entirely on gravel, 2 on tarmac, 1 on snow and two mixed (Monte Carlo - tarmac/snow, RACC - tarmac/gravel). And for easier perspective, we’ll look only into World Rally Championship.
So how do they achieve that?įirst of all, we must look at all different conditions that rally drivers face during the season. Rally tyres must offer the best grip possible at high speeds in any conditions and any surface.
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