I went a different direction and fit bigger tires on stock suspension. Looks like they are about 1" bigger in diameter and a little narrower. It was real tight in there so I wouldn't have gone any bigger than the 215/65/16s I ended up with (Falken Wildpeak AT, late model Audi rims) on factory setup.
Owner reviews for tires
After looking into it a bit I went with a set of Firestone Indy500s that mounted and balanced came out to less than $800. Had them for 6 months now, and no complaints so far.
I have them on my 356 (model CA67) and absolutely love them.
Get rid of the subpar tires. A Michelin climate-cross plus tire would make your car shine.
Have about 5k on the Vredestein quatrac pro xl, on the 17" oem wheels (alltrack s), so far I am pretty happy with them. I have driven them through some serious snow and I would say they perform noticeably better than the oem falkens. They handle the dry pretty well too. They don't squeal as much as the falkens did which is nice, I feel like overall just much better traction. These are the nicest tires I have purchased for one of my vehicles so far.
As far as Indycar goes, it is hard to find a more prestigious tire company than Firestone. They have been a good partner to the Series for a long time.
The owners and drivers didn't want to ditch Firestone because their tires don't fail and they never have to worry about safety.
Narrow, low-profile tires aren't as forgiving over potholes, especially when riding on the 20" wheels.
Aggressor has all the traction of a Dhr while rolling a touch faster. It's pretty shit in the wet though.
Hankooks are noisy in my experience.
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