AFAIK idealno je nadrukati hladne kolko treba, pa kad se zagriju korigirati, i držati ih tako toplima (vožnja ili grijači)...
za one koji kuže engleski evo:Before setting-off you need to ensure that your wheels are balanced, otherwise the vibrations you suffer will numb the feedback through the steering wheel and impair your inch-perfect driving. You do not want to start a track day on brand new tyres, as the large tread depth will cause the tyres to overheat. This in turn will eliminate traction and progressive grip. Conversely you need to ensure that there is enough tread left to get you home after a day of serious abuse.
If you have access to a second set of wheels then use them as you can keep a worn set of tyres on the spares and change the wheels over at the circuit and not have to worry about having bald tyres for the journey home. Another reason for using spare wheels on a track day is to protect your favourite (and possibly expensive) wheels from damage and corrosion caused by brake dust. The brakes take a hammering and will coat your wheels with extremely hot brake dust, which can eat into alloy wheel lacquer and lead to corrosion. The excessive heat generated by the brakes can also permanently discolour the wheel alloy. Before attending a track day you should carry out a visual inspection of the tyres to ensure they are in good condition. Check for cracking of the tread and tears in the tyre sidewall. The last thing you want is a blow-out at 80mph. If you are feeling really hardcore, you could take a set of slicks with you, but be warned; some track day organisers do not allow them and they will also put some serious stresses on your car. You will also find that the cornering forces you are able to generate with slicks will require you to fit a baffled sump in order to prevent oil surge.
Note that the more complex the tread pattern and the smaller the islands of rubber between the tread the more likely you are to rip chunks of tread off the tyre with hard driving.
Before going out onto the track ensure that you check the torque of all the wheel bolts and continue to do so throughout the day.
When at the track, your main concern is to fine tune the tyre pressures. As you abuse the tyres on the track they will get hot and the pressures will rise so you will want to knock them down a bit to compensate (assuming they were set correctly in the first place). The best procedure for this is to do one track session and get the tyres nice and warm, then look carefully at the scuffing on the tread of the tyres. If the scuffing does not extend up to the edge of the tread then you need to lower the pressure by a couple of psi and if the scuffing extends onto the sidewalls then the tyres are too soft and require some more air. You need to consider things like the overall weight and weight distribution of the car (the more weight the more air is required) as well as the dynamics of the track. The outside front wheel of a front drive car will do the most work and so get the hottest. As a result its cold pressure should be slightly lower than the other tyres. The more air you have in the tyre the stiffer you make the sidewall and so the more responsive the car is. This needs to be balanced with maintaining a flat tyre foot print. Low profile tyres have small (and thus stronger) sidewalls and so require less air than higher profile tyres as they will roll off the rim less. A point to note is that it is important to have the correct suspension geometry set up. If the geometry is out then you will have wasted any money you have spent on chassis mods, and you are more than likely to overheat the tyres.
At the end of the day remember to reset the tyre pressures once the tyres have cooled down and carry out a quick check to make sure you have enough tread to get home and that the tyres are not beginning to fall apart. It sounds silly but we have seen sets of budget tyres literally fall apart well before the treads has worn down. Do not forget to take a tyre pump or compressor with you. It is all very well letting air out of your tyres to account for hot air expansion but you still need some way of being able to replace the air at the end of the day.
Track Day Preparation - Matey-Matey GuideTrackDay - Preparation GuideDriving tips for track days
