Will a 345 tire fit on a 19x13 wheel with wide rear fenders on a Chevrolet Corvette C5?

Yes, a 345/30/19 tire on a 19x13 wheel will fit a C5 Corvette with 2-inch flared rear fenders, but your wheel offset needs to be perfectly dialed in to avoid rubbing on the inner fender liner or the leaf spring.

Here is what you need to know to make it work:

• The Sweet Spot for Offset: An offset between +42mm and +44mm is the proven range for this exact setup. A +43mm offset sits perfectly flush with a 2-inch flared fender ⁹. High-end custom wheel builders like CCW have specifically designed 19x13 wheels with a +44mm offset to clear the inner liners while filling out a 2-inch flare ¹¹.
• Inner Clearance Risks: If your offset is too high (e.g., +48mm), the inside of the tire will rub the inner liner and the leaf spring, requiring you to run a thin spacer (like 5mm) to push the wheel back out ⁹.
• Deep Dish/Low Offsets: If you try to run a lower offset to get a massive "deep dish" look, you will likely run out of room on the inner wheel well. Fixing that requires modifying the liner or performing a DIY mini-tub (carefully cutting the stock wheel wells, moving them an inch or so inboard, and fiberglassing the gap) ¹.
• Tire Brand Variance: Be aware that a 345 isn't identical across all brands. Track-focused tires like the Toyo R888R run notoriously wide and will eat up your remaining millimeters of clearance faster than a standard street tire ¹.

Crucial System Warning (Traction Control/ABS): A 345/30/19 tire is roughly 27.1 inches tall. The C5's Traction Control, Active Handling, and ABS systems rely on a specific front-to-rear tire height stagger—the factory split is about 1 inch ⁹. If you run a 27.1-inch tire on the rear, you generally need a front tire around 25.6 to 26 inches tall (such as a 275/35/18) to keep the computers happy. If you deviate too far from this ratio, the car will throw codes and trigger ABS or Traction Control intervention unpredictably.

Difficulty: Moderate. As long as you order the correct offsets (+42mm to +44mm), this is a bolt-on affair. If you guess wrong on the offset, you'll be cutting fiberglass or pulling hubs to install extended studs and spacers.