er...40.

I've now driven one with ACC and 19s and one witout ACC and 18s and tbh they seemed very similar in ride quality in the short time I was driving both. My current XR5 has had some wheel and tyre damage on the standard 18s due to potholes (actually blew a tyre on one !) but rides fairly compliantly for the rest of the time and I found the R set ups mentioned above probably a little more comfortable in ride by comparison.

Thanks for the feedback so far.