I'm in the same boat as Pacemaker1000. I'm currently on stock 19" rims with Potenza RFTs and am seriously considering switching over to (stock-sized) PSS tires once the Potenzas are throw-away. I'd use the same rims and buy a Continental foam/pump kit for the trunk ($79 USD from Tire Rack and good for 4 years). I'd really like to hear feedback from someone who has personally done this.
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Putzo
Current: 2012 E89 Z4 35is
Previous: 2008 E92 335i Coupe, 2007 Subaru Legacy 2.5GT spec.B, 1993 Dodge Stealth R/T Twin-Turbo AWD, 1994 Ford Taurus SHO
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