hey forum, I just put 4 new tires on my 2001 xk8 about 1000 miles ago and just realized that the rear 2 tires and the 2 front tires are wearing on the middle thread ? .... they balanced the rear tires and said the front didn't need balancing..... ( I didn't do a wheel alignment) should I have them all re-balanced or could it be something else ??? lower ball joints are new and the bushings on top of the shocks are new also ....... so are all the brakes.....

 

No tire expert here, but the standard answer would be over-inflation. Shops typically over-inflate the tires to seat them on the bead during the mounting process, but sometimes do not adjust them to the recommended pressure. Check your arm rest lid for reference. Just my thoughts.

 

Tire Air Pressure too high; at 20" wheels, the front should be inflated to 32 psi and the back tires to 30 psi, according to the sticker on the underside of the Center Console Box Lid. Post #4 in the following link shows a picture of the sticker with the inflation guidelines for different sized wheels and tires.

https://www.jaguarforums.com/forum/x...=tire+pressure

 

Thanks guys tires were all over inflated by 2 lbs each.... According to the stats on the arm rest... 18' tires rear at 34 lbs front at 32 lbs adjusted to proper air.............. And we'll wait to see if this does the trick.... Got a feeling it will thanks again tony JAG NOW HAS 85,800 MILES ON IT..................

 

My wife's 2006 XK8's 19-inch tires wear most evenly at 32 psi in the front and 29 psi in the rear.

 

Tony, check the pressure with another gauge also, they can be very inaccurate. I bought what I thought was a quality gauge and it was off by 4 psi. 32/34 has worked well for my XK8.

 

You need to consider lower pressure in the rear. I run my 18" rears at 29-30 PSI, otherwise they wear prematurely in the center. The fronts stay at 30-32 PSI.

I get even wear all around.

 

It would appear that 34 psi only works for 17" wheels.

 

all good answers guys.............. guess i'll keep an eye out for now with 32 lbs front and 34 lbs in rear according to the instructions on the center console.... then if needed i'll adjust accordingly ...............................tks tony.........i'll get another gauge to check also

 

There is a more complete picture in the workshop manual. Look how low the recommendation is for "Rest of the World", "up to 100 Mph":






Wheels and Tires from X103 Workshop Manual

 

I like a Soft (if that could ever describe a XKR) ride and use 26psi Front and 28psi Rear on my 18" Continental DW Summer Tires. No unusual wear observed.

 

What do they consider a 'Rough Road Market'? I have followed the 32 front & 30 back since installing my Pirelli PZero's.

 

Check the tread depth across entire tread and adjust pressure accordingly.