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Old 01-20-2006, 03:54 PM   #5
The Librarian
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Location: Helena, MT
What I Drive: '04 Sonic Blue - SVT 3Door

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You should be looking for a tire that is as close to 24.1 inches in diameter as possible.
SVTF stock diameter is 24.6"...
Regardless, 215/50 would be a tad tall at almost 25.5".
I run 205/55/16 (24.9") on 16X7's (45mm offset) in the winter with no problems, but it's very close.
If you're really set on that size, you might have a shop mount one up, and check for issues.
Though, IMHO, that's just too much.
Not only the aforementioned speedometer error,
but you're also going to lose a significant amount of acceleration out of the hole with that tall of a tire.

Here's a good tire size calculator if you want to check some numbers:

And, here's another one for checking different offset wheels:
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