Yes that frustrated owner was me!!
There's still no sign of alternative dampers, or at least not ones that increase comfort.
I've been watching this thread with interest as I'm still struggling (on & off) with the ride.
I like the idea of the increased profile on the tyre. I think I'd even make allowances for upsetting the speedo.
Just to add a little additional variation to the tyre size discussion then the tyre load rating index can affect the ride. The higher the rating then the tyre will probably have a stiffer and less flexible sidewall structure that can lead to a harder ride.
e.g. For my old Fiat Croma 2005 when I changed tyres the original fitment was:
Bridgestone Turanza215/50 R17 91W (91=615kg)
which I replaced with:
Kumho Ecsta Sport KU31 - 215/50ZR17 95W XL (95=690kg)
and the ride was firmer!
For a 2015 500X the tyre options were:
215 / 60 R16 95H (690kg)
215 / 55 R17 94V (670kg)
225 / 45 R18 91V (615kg)
225 / 45 R18 91Y (615kg)
all with same tyre pressures.
Like with the Bridgestone Turanza and Kumho Sport it is not un-common to find that different make same tyre size and speed rating having different Load Indices.
Maximum Axle Weight for a 500X is 1150kg (front) for 1.4MultiAir and 2.0MultiJet which equates to 575kg per wheel. A load index of 89=580kg. A load index of 90=600kg. So Fiats 91V (615kg) has a safe running margin and should be the minimum chosen for any wheel size.
Any scope for manoeuvring depends on tyre manufacturer offerings within each size/profile/speed rating they produce.
Needless to say when "playing" with wheel sizes and tyres expensive mistakes/dislikes can occur. Some find some makes of tyre to be too soft/compliant and lack cornering stability other find some to be too hard or too noisy.
Also not all tyres have the "Rim Protector Lip" so you could find you have a lovely tyre you are very happy with only to get messed up rims!
Lastly there is no such thing as a perfect ride and handling and low noise etc. :devil: