use the tyre calculator to calculate what's the best size going up from 16" to 17" to keep your speedo reading as accurate as possible.
Example of tyre calculator : http://www.miata.net/garage/tirecalc.html
There are heaps other tyre calculators out there
rule of thumb, if going up 1" in rim size, increase the width of the tyre by 20, and reduce the profile of the tyre by 10. So if original spec is 205/55R16, going to 17 you should use 225/45R17.
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