C6 Tire size ? 255/35/18 & 285/30/19 on C6 wheels OEM -Any problems?

[rcarbonetti]

I have some OEM C6 wheels 18x8.5 &19x10. I have 2 Dunlop SP 9000 rear tires 285/30/19 for the rear wheels. I am considering the Dunlop SP9000 in the 255/35/18 for the front set. Will this work without causing any problems in active handling or othe areas of the car. The combination would be on a 2000 convertible. Thanks in advance for the forums help. Here are the specs from Tire Rack: 255/35 ZR18 SL 280 AA A 1323 lbs. 51 psi 10/32" 24 lbs. NA 9" the C6 wheel is 8.5" 10.2" 9.1" 25" 832 285/30 ZR19 SL 280 AA A 1477 lbs. 51 psi 10/32" 28 lbs. NA 10" 11.1" NA 25.9" NA