Sean,
A quick question before I start.
Are you American or schooled in America?
Ok,
My wife has the same issue with 245/45R19 tyres.
They are like fat rubber O rings!
At the recommended pressure of 38 psi it rides like a billy cart, and her top line model, handles like a slot car, and not comfy at all.
Around town, I set them to 30 psi for comfort, but if we do any open road work I put them back to 38. Low tyre pressures produce temperature increase from flexing side walls.
The higher the speed the higher the wall flex the hotter the tyre gets.
Below image:
This is an extreme example of tyre sidewall flex, but the pic really shows it well.
What most people don’t understand is that the tyre has to “grip” the road as it turns, it momentarily stops, grabs the road, then the transmitted power turns the wheel, thus pushing the vehicle forward.
If it doesn’t “grip” the road, it breaks traction (overcomes it’s maximum friction point) or spins
The other issue we have with under inflated tyres are bad tread wear.
She doesn’t do too many k’s so, I haven’t noticed to much of this to be honest, but I do rotate the tyres (front to back only as her tyres are directional and asymmetric)
*please see another post of mine regarding these type of tyres*
Badly inflated tyres look like this, and produce this type of tread wear.
Of course you can go for a smaller wheel & higher profile tyre package to get the ride you are seeking.
Just be careful about the rolling height (that means same tyre revs per kilometre) to ensure correct speedo reading.
If not, a technician may be able to adjust this with a laptop at a dealer or repairer.
Most of the time I'm navigating Sydney's 'orrable traffic.
