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Tyre Pressure

Tyre Pressure

  • What should my tyre pressure be for track driving?
    Tyre pressure for track driving depends on various factors including vehicle characteristics, tyre type, track conditions and driving style.
    Tyre pressures increase significantly when driving on the track due to the increase in tyre temperature. Therefore, you will need to check and adjust your "hot" pressures. If your "hot" tyre pressures are too high, you will need to bleed air out of the tyres to arrive at pressures that give good grip and vehicle balance along with tyre wear as even as possible.
    Be careful not to reduce tyre pressures too much as this could be dangerous when driving at very high speed around the track. Low pressures will also reduce driving precision due to loss of tyre firmness.
  • Why should I check and readjust my tyre pressures as necessary before leaving the circuit?
    This is because as your tyres cool down after the track session their pressure decreases, meaning that your pressures will probably be too low for road use. Therefore, you will need to reset your tyre pressures, ideally when the tyres have cooled down and before driving on the road.
  • How often should I check my tyre pressure on the track?
    As tyres heat up, their pressure will increase with each lap until they reach their operating temperature. Tyre pressure should therefore be checked and adjusted as necessary after each of your early sessions (4-5 laps) so as to attain the optimum pressure when hot. Recheck the hot pressures from time to time during the day, especially if the conditions change.
  • What sort of gauge should I use to check my tyre pressures for track driving?
    We recommend using a high quality, precise tyre pressure gauge.
  • What pressure should I use for track driving with Michelin road tyres (e.g. MICHELIN Pilot Sport 4 / MICHELIN Pilot Super Sport tyres)?
    For Michelin road tyres, we suggest “hot” track pressures around 0.3 bar (4 to 5 psi) above the standard recommended cold tyre inflation pressures. If your tyre pressures are too low, this can lead to excessive flexing of the sidewall, a sensation of sponginess, a lack of steering response and abnormal wear. Pressures that are too high can lead to reduced grip, light steering, and even localised overheating.
  • What pressure should I use for track driving with Michelin track-focussed tyres (e.g. MICHELIN Pilot Sport Cup 2)?
    For a track day, always begin with inflation pressures recommended for ROAD USE, gradually bring the MICHELIN PILOT SPORT CUP 2 tyres up to temperature with steady moderate laps.
    - After a run of some steady laps, then only slightly adjust, the inflation pressure to reach the best operating inflating pressure
    HOT TYRES
    - The best operating pressure of MICHELIN PILOT SPORT CUP 2 is between 2.3 bar (33 psi) and 2.7 bar (39 psi) hot, according vehicle model and track where used
    - However, some vehicle models will need a higher inflating pressure than 2.7 bar (39 psi Hot)
    COLD TYRES
    - Don’t ever use inflation pressure below 1.9 bar (28 psi) cold
    - To optimize the track longevity of MICHELIN PILOT SPORT CUP 2, MICHELIN strongly recommends to use a minimum inflation pressure between 2.0 (29 psi) and 2.4 bar (35 psi)
    CAUTION
    - Regularly check the aspect of external sidewalls: If you notice any level of wear to the sidewalls (erasure of the sidewalls markings) that could mean that Inflation/operating pressures are TOO LOW . So, re-set at least to +0.2 bar (+ 3 psi) minimum to increase the grip and maximize the track longevity of your tyres
    - After a track day
    Before leaving the track to drive on the road again: once tyres have cooled, re-set to car manufacturer inflation pressure recommendations.
  • What pressure should I use for track driving with Michelin motorsport tyres (e.g. MICHELIN S9H tyres)?
    Michelin motorsport tyres have a "hot" operating pressure of around 1.9 bar. Contact Michelin for details about inflation pressures for your tyre size and application.
  • Do I need to change my tyre pressure depending whether the track is wet or dry?
    On a wet track, it is advisable to use the vehicle manufacturer's recommended tyre pressures for road driving.
  • Why do you need more pressure in a rain, or "wet" tyre (0.5 to 1 bar) than a slick?
    You don’t always need to increase a rain/wet tyre’s pressure when warm to get the most out of it.

    However, to obtain the equivalent pressure when warm, the tyre’s starting pressure when cold must be higher. This is due to the cooling effect of the water on the road. In some cases, higher pressures are necessary to prevent aquaplaning.
  • Is nitrogen inflation suitable for track use?
    Yes. However, it is not necessary to use nitrogen inflation. Although nitrogen inflation slightly slows the gradual natural loss in tyre pressure, this is too small to be measured during a day on the track. Also, the thermodynamic characteristics of nitrogen are too similar to those of air to affect the increase in tyre pressure that accompanies an increase in temperature. Remember also that air is 78% nitrogen. We recommend using the driest air possible.

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