Reply to "Larger diameter wheels. Upgrading wheels and tires. Resizing wheels and tires. Modernizing wheels and tires. Campy clones, etc."

Isn't 11" too wide for a 285? Check the manufacturers chart.

It is going to tell you the minimum and maximum recommended wheel width, then will tell you the "design" width for that tire.

It is the design width that you want to match.

The size of the tire on those wheels is not out there because of the power that needs to get to the ground.

It is for the look of the tire and what the owner thinks fills the wheel well "correctly".

All those "turbo look" Porsches don't need the tire for power.

Personally I think the car handles better with the 285 than the 335.

What happens is that you really are getting inadequate loading on the bigger tire and all you do really is just spin them.

The car is going to be similar to using racing tires on the street and that simply means the tires are constantly slipping in order to gain more traction, if that makes sense.

On the race track you practice with your set up but on the street if you drive it hard then your tires are slipping as if they are on wet pavement and is that really what you want to do?

Lots to consider with going to those wheels. It only seems simple.