I think you can size down on the 20s for PSS to get them to work.
I had 20" P-Zero and they lasted exactly 9k miles. They were noisy and were a little harsh on the ride.
In the last month, I moved to 21" OEM-sized PSS and they are wayyyyyy less noisy, ride smoother, and provide as good if not better grip. I will never buy Pirelli ever again.
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2017 X5M, Donnington Grey, Aragon Brown
Eisenmann Pro, Dinan Intake, BM3 Stage 1, XHP Stage 3
21" Vossen VFS-1 on Michelin PSS
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