Rotated my tyres (as per the handbook) today - a first for me. The reason I did was because the rears have worn more than the fronts and as mine is a RWD 2500 Suburban and winter is approaching, an extra mm on the driven axle could be the difference between getting off my driveway or slithering to the bottom.
What has me confused though is that the rear tyres aren't only more worn than the fronts they are more worn in the centre. This would suggest over-inflation but they've been run (for 5700 miles) at 50psi - which is the 'comfort' pressure as per the door jamb sticker. The fronts have been run at around 45 psi and show even wear.
So, could it be that the different size (265/65. 17) require different pressures to the stock (245/75. 16) tyres? And, should I run lower than 50psi at the rear (for more even tyre wear)?
What has me confused though is that the rear tyres aren't only more worn than the fronts they are more worn in the centre. This would suggest over-inflation but they've been run (for 5700 miles) at 50psi - which is the 'comfort' pressure as per the door jamb sticker. The fronts have been run at around 45 psi and show even wear.
So, could it be that the different size (265/65. 17) require different pressures to the stock (245/75. 16) tyres? And, should I run lower than 50psi at the rear (for more even tyre wear)?