The two problems, excess tyre wear and mid turn oversteer are not necessarily connected.
The tyre wear, I'm assuming it is on the rear wheels, is caused by the rear axle not lifting clear of the track during some part ofthe turn.
This can be caused by the rear track being too narrow or because the front geometry is not jacking up the rear early or high enough.
Mid corner oversteer can be caused by a number of things. Essentially, it is the back sliding outwards in the turn.
It can be because the rear track is too narrow. In order to raise the inner rear enough to turn, a narrow rear track will tilt the outer tyre so that less of the contact patch is on the tarmac.
It can be because you have braked incorrectly. When you decelerate the 'weight shifts' from the rear to the front of the kart. The rear gets light and loses grip. (Thinks rear wings on F1 cars). Just turning on its own is a deceleration. If you also have the brake on, you may cause the rear wheels to skid, loosing mechanical adhesion with the road, 45% of the grip of the kart.
It may be because you start accelerating too early and too hard.
It can be because your rear wheel pressures are too high. (if you are getting high temperatures, this will increase your tyre pressures, the pressure will go up and down as rapidly as the temperature)
It can be because you are getting too much authority at the front, you need to reduce the front end, and steer wider.
It can even be because you are steering 'round' the corner, where your competitors are turning in, then steering straight across the apex then turning again at the exit, so there's no tendency for middle oversteer. They appear to be 'cornering' faster than you because they aren't cornering all the time so you are throwing the kart in too fast to compensate.
You also have the opportunity of stiffening or loosening the rear by adjusting the rear bumper (especially if it is CIK plastic) or adding / rotating a transverse torsion bar.
I'm not an expert, but I have made all these mistakes.
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Inconsistant rear tyre wear by 'Michaelt1' (18 Sep 2011 @ 16:36)
