Budget M3

I searched the tire forum, but cannot find an exact answer or first hand experience with my question, so here goes:

How safe is it to run a 102W load rated tire on the Cayenne? I do not tow with the vehicle, and usually have no more than two people plus luggage on board.

I got a good deal on Michelin Diamaris 275/40R20 tires, but they are the 102W load rated (BMW OEM). Porsche calls for 106Y load rating for the Cayenne in this size. Should I run extra tire pressure to compensate for the difference in load ratings? Should I be concerned when driving extended distances on the highway with a fully loaded vehicle (4-5 people plus luggage and 200lbs on the roof)?

Any and all advice would be appreciated...
Thanks,
Mark

charlieXS

It looks like the extra Load rating takes the max load from 1874lbs(102) to 2094 (106)

I guess that's 7300lbs for the 102's and about 8380lbs for the 106's...

Our V6 have curb weight of 5200lbs... add 4 passengers (750 lbs) and a roof box (200lbs) and camping gear (300lbs) and you have 6450lbs.

That heavy load represents 88% of your load carrying ability with the 102 rated tires...

If you want MASSIVE load capacity, go to a 275/45-20 with a 110y rating which gives approx 9300lbs capacity.

Budget M3

Thanks, Charlie...that was very helpful...

charlieXS

what wheels did you decide on?

Budget M3

20-inch OZ Canyon ST's (~34lbs/ea)...best value that is within talking distance of the weights of the OEM wheels in this size...

charlieXS

nice... to match the oe spec you'll need a 32lb tire... and the Michelin is 33lbs... so you're within 1 lb of a sportechno wheel/tire...

well done!

C

Kooser

Smart choice, and even better yet...sweet looking choice, as nicely pictured on charlieXS's post on Cayenne wheel options.

Maybe I should have picked these too in 20" or 22" instead?
Oh well, ambivalence will kill me.
I already commited this afternoon to the Kahns, so better love them or there might be a FS post soon!

Kooser

Some general info here -which you probably already know or have accessed.
http://www.tirerack.com/tires/tirete....jsp?techid=35

You could always just travel with emaciated friends only!

Budget M3

Thx for the info...I had seen that, but it did not help me much until charlieXS did the math...d'oh...

As far as the emaciated friends...well, since at least half my friends/family are women, I would NEVER imply that they need to be emaciated to ride in the Cay. Don't worry though, I won't tell them you said that

Just put the "wheel wax" to them (I use Liquid Glass), and am having the tires mounted and balanced tomorrow...will post pics of the finished product when I get around to it...