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Looking to put new z06 wheels on my 89. I would like to have 17x9.5 and 17x11. But I don't think the z06 wheel that I want comes in 17x11. So 18x10.5 is next best. What size tire will give me the same width as the 315x35x17 tires?

will there be a problem with the tire rubbin?
 

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A 335/30-18 would be the best size in terms of height and maintaining accuracy of your C4 speedometer however it may be too wide for the 10.5" rim and may also rub. Check with the tire shop before buying.

Next best option would be 315/30-18 which should be a safe option in terms of clearance (assuming wheel offset is correct) but will cause your gauge to indicate 1-2 mph faster than you're actually going.
 
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