[Catfish454]

I've just swapped out the horrible Goodyear RFT's that came on my 2014 550i X-Drive with non run-flat Michelin Pilot Sport A/S 3's in the same size (245/40-19). The door decal specifies 38 PSI in front; 39 PSI in rear. My question is: Should I use the same air pressure in these non-flats? I had the dealer install the tires and they put 35 PSI all-around.

[Nitrous Garage]

35 psi is fine

[sp33d3ple]

my 2014 550i xdrive came with 35psi on the stock Eagle's. I inflated to 38/39 and it feels much better...mine came with dynamic handling package and at 35, i was feeling the bumps a bit too much. now i'm gelling at comfort +

How do you like the Michelins? Are they more gripy? Why did you change? What do you plan to use for winter?

[RW Carbon]

35-40 psi is in the perfect range for your car. Just depends on the how you want it to ride.

[Catfish454]

The Michelins are light years better than the cursed Goodyear RFT's. MUCH smoother ride, quitter, better traction and handling. I have the DHP also, and combined with the new tires, the car is now a lot more fun to drive. Since I live in Virginia where we don't get a lot of snow, these will stay on the car year-round. As for flat tires, I now keep a Conti Mobility kit in the trunk, along with a tire repair kit. For long trips, I have a compact spare and small hydraulic jack.

[sp33d3ple]

I wonder if 245/45/19r's would rub if I was to replace the 245/40/19r's... I like the stock 19inch M double-5 spoke wheels and they don't come in 18's...but would def appreciate a little more meat on the 19's. Winters are rough in NYC and I won't survive January with 40's...

What's the lowest that anyone has gone on the rim size to gain more on the aspect ratio?

[exylyr]

Originally Posted by Catfish454

The Michelins are light years better than the cursed Goodyear RFT's. MUCH smoother ride, quitter, better traction and handling. I have the DHP also, and combined with the new tires, the car is now a lot more fun to drive. Since I live in Virginia where we don't get a lot of snow, these will stay on the car year-round. As for flat tires, I now keep a Conti Mobility kit in the trunk, along with a tire repair kit. For long trips, I have a compact spare and small hydraulic jack.

Where'd you get the Continental mobility kit?

[Catfish454]

Picked up the Conti "Comfort Kit" at Tire Rack for $79.
http://www.tirerack.com/accessories/detail.jsp?ID=38