Misinformation? - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Misinformation?
Posted by Brooks G (more from Brooks G) on Mon, 6 Apr 2009 21:00:57
In Reply to: Re: New Rial Wheels on viggen, Will they fit?, simul8guy, Mon, 6 Apr 2009 19:05:04
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Wrong, it is not misinformation. 215 or 225 is the nominal section width in milimeters of the tire (how wide it is), 40 is the aspect ratio (the ratio of width to height of the tire). To get the distance from the wheel to the tread, you multiply the section width by the aspect ratio and divide by 100 (as the 40 is a percent). So a 215/40 is 86 mm in height and a 225 is 90 mm.
That means the tire is larger in diameter and therefore covers more distance for each revolution. Since the speedometer and odometer count wheel revolutions; well you figure it out.
Brooks,
posted by 67.170.6...
Posts in this Thread:
- New Rial Wheels on viggen, Will they fit?, Adam from PA, Mon, 6 Apr 2009 05:55:42
- Should be fine., RBatsch, Tue, 7 Apr 2009 05:42:49
- Re: New Rial Wheels on viggen, Will they fit?, Brooks G, Mon, 6 Apr 2009 17:54:52
- about 1 mph difference more or less...., crawdad , Tue, 7 Apr 2009 07:15:12
- Re: New Rial Wheels on viggen, Will they fit?, simul8guy, Mon, 6 Apr 2009 19:05:04
- Misinformation?, Brooks G, Mon, 6 Apr 2009 21:00:57 <-- Viewing This Message
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