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This is the wheel/tire combo I would like to go with on my 95 C4. I am concerned with speedo and computer problems. If there is any experience out there tell me the pros and cons.
both the C5 and C6 are designed to run taller tires in the rear which is why the larger diameter rear wheels make sense. The C4 however is designed to run the same diameter front and rear tire which is why the wheels sizes are the same front to rear.
can they be bolted on to the car ... yes
will the 305 stick out of the fenders ... yes
will it have an adverse effect on the cars handling ... yes
will you notice that effect ... probably not unless you have a huge amount of road course experience
will your speedo be correct ... no (probably wasn't anyways )
With the right offsets,the Grand Sport fitment will work on your car. For larger-diameter wheels,you just reduce the aspect ratio. You could go 18x9.5-275/35 and 18x11-315/30,which looks good and provides great handling.