6th June 2010, 07:02 PM
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Senior Member
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Join Date: Feb 2009
Location: Vilnius, Lithuania
Posts: 1,249
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The stock sizes on the Sierra are in fact 185/70R13 and 185/65R14, so the 15" size that matches best is 195/55R15. People often get 195/50R15 tyres, they make the speedo overread by 3.4%. 195/65R15 would be 6.4% too slow.
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