Wow, back from the dead...

They worked out fine. I drove the car with the E90 setup for a month, then bought a new set of BF Goodrich g-Force Sport A/S tires. At that time I changed the back tires to 245/40 size which is correct for a Z3.

Drove it for 3 years/15k miles before I sold it to someone else. I never had any problems with the setup and they seemed to wear quite well. However, since I sold the car over a year ago I really can't say what it's like now.

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'04 Volvo C70
'99 Porsche Carrera 4
'87 VW Cabriolet