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Message: <blockquote data-quote="alantiong" data-source="post: 681338" data-attributes="member: 19754">tyre pressure are in PSI - pound per square inch. therefore to achieve same "hardness", size doesnt matter much-if you are an ordinary average joe driver. however, if you are fussy like i am... then .. please consider below..1. in a balance car like 3 series, you really want to have four patches of rubber having the same grip, thus same contact surface area. More pressure less contact patch. i believe you will have a staggered combi?? then  you need to have different pressure. i will however, to simplifiy things, go with 2.4bar for all to start with.2. if you can handle the harshness of the tires, then good. otherwise  reduce 1 psi everytime and try it out till you are ok with it.  shouldnt be much +- from 2.4.3. now again this is very dependent on how u drive. at balance pressure and wider tires at the back, you should be facing understeer for your car. 90% people dun even feel this. if you are one of those, then dun bother. if you do, increase teh presure 1 psi at a time till you feel the car is neutral to your driving. it should be around +4 to +5 psi from 2.4 bar. it can be different for your case. do take into consideration most driver prefer understeer than oversteer.4. with all that said, most average joe will say.. heck with it.. just go 2.4 bar in front.. 2.6 bar behind. end of the day, the first 3 steps is really the basic of settign up tyre pressure for track and can be too much work for daily drive.</blockquote>

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