Kendall or anyone else with direct experience: If Bridgestone discontinues our rear tires, I would consider running a different set of 19” tires, raise the rear shocks 3/4” or so, and just accept that my speedometer will be off somewhat; because I want to continue to use my base style wheels. Do you know whether a shorter tire affects the antilock brakes? Does it display an ABS error?
The Goodyear OEM 315/40-19 tire is 28.92" in diameter.
The Bridgestone 345/35-19 tire is 28.51" in diameter.
If the Bridgestone Scuderia goes away, and you want to keep your OEM rear rims, I suppose the best/closest option would be a
305/35-19 which is 27.41" in diameter. 1.5" smaller (yuk!) in overall diameter AND 10mm narrower (yuk!) than OEM. Both Michelin and Pirelli have tires in this size.
There are 3 issues with the smaller diameter tires;
1) Wheel well gap - which is borderline too much with OEM tires - is going to get very noticeably worse.
2) You are going to lose another .75" of ground clearance
3) Speedo will be noticeably off (but which may be correctable)
If we play with suspension (perch height), the ground clearance can be solved but this would worsen the wheel well gap making the car just look silly, IMHO. (Fully 1.5" MORE wheel well gap. Barf!!)
As to the ABS, I don't *think* it will necessarily care about the diameter of the rear tires... AS LONG AS you keep the ratio between front tire diameter and rear tire diameter close to stock. In short, you will also have to select tires that are smaller in diameter for the front of the car as well.
Give me a day or so and I will post a couple of tire brand/model/sizes that would work.... although I really think going to a 20" wheel in the back - though expensive, may be the lesser of the evils. (Obviously it would necessitate the purchase of 4 wheels.)