Re: Tire Size - Saab 9000 Bulletin Board - Saabnet.com
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Re: Tire Size
Posted by Bill Davies [Email] (more from Bill Davies) on Sun, 13 Sep 2009 10:30:41
In Reply to: Tire Size, splice1, Sun, 13 Sep 2009 08:33:10
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The middle number is the aspect ratio, in other words a "60" tyre is 60% as tall as it is wide.
Typically, if you go up a size in wheel diameter you go down a size in aspect ratio to keep the overall diameter as close to the same as possible - otherwise the gearing changes. A calculator is at the link below.
Although some early 9000s on 16" wheels - up to 1992, I think - were supplied with 205/50 tyres (that's 50, not 60) the new-shape spec is 205/55-16. A few people fit 206/60-16 but I personally reckon they would be on the floppy side, and your speedo would read over 3% slow compared with the 205/55 (say 2mph at 60).
215/50-16 might be tempting, slightly wider, slightly shorter sidewall. Some people report rubbing issues, some have no problems.
Miata tire size calculator.
Posts in this Thread:
- Tire Size, splice1, Sun, 13 Sep 2009 08:33:10
- Re: Tire Size, Bill Davies, Sun, 13 Sep 2009 10:30:41 <-- Viewing This Message
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