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, Fri, 17 Jul 2009 09:11:37
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Saabs will have positive offset. An easy way to visualize offset is to think of the old "deep dish" wheels on muscle cards. Those were negative offset. Negative offset moves the tires out away from the car. Postitive offset moves it in closer.
You should not generally change offset very much (as in a couple mm), even when changing width of the wheels. The reason is that as you move the centerline of the wheel, you change the load on the bearings. That's not a good thing. Try to stick with a wheel that is close to stock offset no matter the width. Offset is in the manual in your glove box. If it varies with wheel width for the stock wheels, go with their specs.
Note that as the wheel gets wider (with the same offset), the added width is dispersed to both sides. So, if you go from 6.5" to 7.5", you are adding a half inch to each side of the wheel.
More important in most cases, is what you are doing with tire width. If you go from a 215 wide tire to a 245 wide tire, you are adding 30mm to the width of the tire. That means that you are adding 15mm to each side of the wheel. As a better measure, check the specs for the specific tire you are planning on ordering, they do vary despite the stated width.
Lastly, the easiest route is to just check the manual for the stock optional wheels and tires. Include the viggen specs in your survey. All those combinations should work when increasing wheel diameter (when downsizing there are sometimes brake issues, but not when upsizing).
posted by 98.110.15...
, Fri, 17 Jul 2009 09:11:37, Sat, 18 Jul 2009 05:00:13
, Mon, 20 Jul 2009 08:11:12, Fri, 17 Jul 2009 12:03:20
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