That's probably going to raise the rear enough to tilt the rear of the deck up and throw off the geometry of the carriage. They don't make lawn and garden tires for 13" wheels, either.
Excuse my ignorance, but why is this such a huge deal? I haven't crunched the numbers, but you probably won't even increase your speed by 1 mph. The deck will cut better if you are going a little slower, anyway. The tractors with the fast second gear go a little too fast to do a good job mowing in some conditions.
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