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Effects of wheel size change: 19" to 20"

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I'm contemplating a second wheel set for my upcoming '13 LS. I'm wondering what the track/road effects will be going to a 20" wheel.
Speedometer calibration?

Tire outside diameter dictates speedometer accuracy; wheel nominal diameter should not be used to determine speedometer accuracy.
smittytx said:
The biggest effect will be to your wallet when you get new tires. If you're getting them for the track, go with 18" wheels.

+1. But if you can afford a '13 LS your wallet can probably handle it.

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