We run an 18 in. impliment rear rim on the 608 AA/GL. We went to 322 in 2012. When the wheels were fabricated, the wheel builder added safety beads by running really nice weld beads around the rim. These were probably made about 10 years ago.
When we were a sub-300 car, they used to only run 60 psi. And it spun once at about 280 and did not rip the bead off the wheel.
Now we run around 100 psi, plus or minus a little, depending on how the roll outs measure up, and I think the added pressure helps the traction. We have suspension, so I can't add anything about ride quality.
If the salt condition gets worse than 2012, they'll be a whole lot more thinking about traction going on.
Frank
