Rim size and tire type is really a trade-off... - Saab General Bulletin Board - Saabnet.com
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Rim size and tire type is really a trade-off...
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Posted by REM in Seattle [Email] (#4) [Profile/Gallery] (more from REM in Seattle) on Sat, 18 Sep 2021 22:21:00 Share Post by Email
In Reply to: Question, Paul from Palmyra, PA, Sat, 18 Sep 2021 04:37:45
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As an example I have a Volvo XC60. The vehicle was available in various trim levels with rims from 18 to 20 inch diameter.
In the table below you can see that all the tire/ rim combinations have the same diameter but the section (profile) height changes by 1 inch from 18-inch to 20-inch. That 1 inch of section ((profile) height makes a difference in ride quality and steering response, as well as impact resistance and road damage.

RIM___SECTION___SECTION
DIA.__WIDTH_____HEIGHT____DIAMETER
18____9.25______5.55______29.10
19____9.25______5.09______29.18
20____10.04_____4.52______29.04

The type of tire, i.e. touring vs sport tires makes a difference as well. Also, the larger rim/tire combinations are typically weigh more than the smaller rim/tire combinations.

So the choice of rim size and tire type is really a trade-off on many fronts. Ride quality, steering response, impact resistance, wet weather and snow traction/handling, etc.

The roads here in the Pacific Northwest are generally in good condition and I do not venture off road, so the 20-inch rims work well enough for me.



->Posting last edited on Sun, 19 Sep 2021 13:15:25.

_______________________________________
REM in Seattle

Current:
2013 Volvo XC60 R-Design, Rebel Blue, 3.0L 6-cyl turbo, Automatic
2005 Saab 9-3 Aero Convertible, Steel Gray metallic, 2.0L 4-cyl turbo, 5-speed 

Former:
1998 Saab 900SET 5-door, Silver, 2.0L 4-cyl turbo, Automatic
1991 Alfa Romeo Spider convertible, Alfa Red, 2.0L 4-cyl, 5-speed
1984 Saab 900T 3-door, Red, 2.0L 4-cyl turbo, 5-speed
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