.................Let the ranting begin...................
Could people tell different tires in a blind test................... Well, hard to tell, but make no mistake tires are not all the same and they do perform differently.
So, this is season 18 for me on my ST1100 and I've run a wide range of tires on it. Most recently, in reverse order BS T31 GT, Avon XM 3D, Metz Z6, BS T30 Evo and BS T30. I've upgraded suspension, to the extent possible on a bike designed 30 years ago, with Progressive forks springs and heavier fork oil and a Progressive shock + set sag. This season aside, half of my annual mileage is usually spent in the US on roads in southern Ohio, Virginia, West Virginia, Kentucky etc......... where there are amazing roads that we just don't have here in Ontario.
If you're riding Ontario roads at legal speeds or even 20 -30 over then you'd be hard pressed to tell the differences between the various sport touring tires that are out there. The Forks of the Credit (really??), the 507, Glamorgan, 518 etc..... are curvy roads, but you'd have to be running them way way over the speed limit to put any real demands on your tires. If you are on much more technical roads that you're more likely to find in the US then there are differences that the average rider would certainly, IMHO, be able to determine.
So, T30 and T30 Evo are great tires, sticky and inspire great confidence in corners, short lived. Metzeler Z6, good tire, somewhat sticky, does slide a bit in corners, Avon XM 3D, terrible tire, when pressed slides way too much in corners and very slippery in rain, will never buy another Avon tire... T31 GT, so far, good tire, long life predicted vs T30 and T30 Evo, have only used in Ontario this season so aggressive cornering capability TBD.