Erm, I asked
how to control it.
This ^ is spot on..
It could go to many more pages.
. How do you control understeer.
Which is good and bad advice depending on the front/rear drive of the vechile and mainly the drivers ability.
For me new tyres always go on the front and get swapped front/back halfway through. Generally tyres with more tread flick up more debris which can puncher the rears (Like we all do I hate scraping new tyres) together with providing less grip in dry and damp compared to worn tyres due to tread block movement, hence unless in standing water your more likely to oversteer with new tyres on the rear, so as most drivers prefer understeer this advice maynot so good advice.
That said, with some drivers I fail to see what difference it makes just as long as tyres are swapped to save them cracking up..