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OEM tires are a compromise in terms of comfort, lifespan, costs, and fuel economy - IMO, not very good at any of them. Swapping to a different tire, like a Bridgestone Turanza or similar touring tire can make a huge difference. More a function of how the manufacturer designed the tire construction than the size.
Especially if you are bottoming out the suspension - might have to upgrade the springs. On my 2002 Corolla - I'd routinely bottom out the suspension with even a hit of a load in the trunk. After swapping to TRD performance springs, which even after lowering the static ride height by an 1.25", only bottomed out a handful of times. All in the spring rate - even a mild increase can have a huge impact in ride quality.
Eventually going to go down this road on my current Matrix XRS - even with the factory upgraded spring rates. For long trips, especially loaded with coolers filled with ice, fishing/camping stuff, etc. - there are times where I run the car into the bumpstops.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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