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  1. #1
    Administrator Skid's Avatar
    Join Date
    Jun 2009

    AC: Tyres Info & Abbreviations

    What are the differences between tyre compounds?

    Road legal tyres
    Street and semislicks are road legal compounds, used on the road. They wear out slightly. Their main problem is overheating, but after you have overheat them you can wait and start again, they can give similar grip even after lots of km's. In the end they will wear and lose grip totally.
    Street tyres optimum temp: 75C - 85C but "easy" under and over those temps. Very easy to overheat after some laps on a circuit, especially on fast corners.
    Semislicks: 75C - 100C but a bit less grip under that and overheat quite faster over that. They have more grip of course and can resist more fast laps, but do not like much abuse and drifting. They wear gradually and lose grip km after km.

    GT2 slicks
    The main difference of the GT2 cars is that manufacturers are actively developing tyres during the season and bring different compounds on the various tracks. We can't of course simulate specific compounds for specific tracks, but we offer 5 different compounds
    SuperSoft: 90-105C Don't like to be driven under or over that range. They wear out very fast
    Soft : 90-105C as Supersofts. they wear out fast
    Medium: 85C-105C as supersofts over their range. They wear out in a linear gradual way
    Hard: 80-100C a tiny bit easier than supersoft outside their range but nothing too radical. They wear just a tiny bit after the initial laps and then stay quite stable for a long time until they start to lose lot's of grip
    SuperHard: 80-100C as Hards. They wear a tiny bit and stay stable for lot's of laps until they let go.

    GT3 slicks

    The biggest difference between GT2 and GT3 cars are their tyres. GT3 tyres are fixed for the whole season and the organization decides what tyres the car have to use. We provide 3 compounds that are not equivalent to their GT2 counterparts (worse).
    Softs: 80-110C . Wear VERY fast. We've been told that they were actually used only for a couple of times in qualifying.
    Mediums: 75-105C Wear linearly and predictably. all around tyre
    Hard: 70-100C Wear a tiny bit after a couple of laps and stay stable for a long sting. Not great grip but they are predictable and can be used in a wide variety of tracks and temperatures. Often "forced" by regulations on cars.

    The hypercars slicks (Zonda R and 599XX) are a bit worse parents of the GT3 tyres. Let's say a generation behind. Rest of their characteristics is very similar to the GT3 tyres.

    Vintage F1 67 Tyres

    We provide just one compound for such tyres, although we learned there were actually different compounds. As a matter of fact, there is documentation reporting that Jim Clark choose the tyre that permit him to slide more for the race at Monza. Unfortunately there is not enough documentation for the compounds so for now we stick with just one compound. If anybody has more info regarding the matter, I'd be happy to discuss with it.
    optimum range 50-90C The tyres are good at low temps, and can withstand overheating pretty well. The tyre wear is gradual, you can expect to do a full race without problems, except if you overdrive and overheat them too much.

    The tyre ranges are not perfect ranges but a min max range that you might not be able to understand a difference in tyre grip. Temperatures are also vary quite widely from straight to inside a turn, so optimally you need a tyre that stays at the lower end of the optimum temperature just before the braking zone and at the higher end of the optimum temperature at the exit of the turn. Not so easy to obtain.
    In AC going outside the optimum range, doesn't mean the car will become undriveable. This characteristic is a double sword. You might think the car is good, but you're not driving on the optimum grip, so you'll lose time without understanding it. There's depth to be found and explored within the AC tyre model.

    Another hint for tyre temperatures, as in real life, use more camber to heat faster a part of the tyre tread and then this dissipate to the rest of the tyre. More camber, more heat, less camber, less heat.


    = Street Vintage

    ST = Street
    SM = Semislicks
    SS = Slicks SuperSoft
    S = Slicks Soft
    M = Slicks Medium
    H = Slicks Hard
    SH = Slicks SuperHard
    HR = Hypercar Road
    I = Intermediate
    V = Vintage


  2. #2
    AEF Member Felix_Culpa's Avatar
    Join Date
    Jun 2015
    Canberra, ACT

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