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Larger wheels= Lower milage?

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Old 01-26-2008, 10:28 PM
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FlyingDog
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Originally Posted by mark kibort
actually, im now at 26.2" rear tire diameter. interesting, ive been clocked by radar at exactly 60mph when the indicator reads 60mph. for some reason, maybe safety margin, the stock wheel will indicate faster than you really are.

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I've heard that GM specs their cars to read 6-8mph over at 60-65mph. Most car companies go for 3-5mph.
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Old 01-26-2008, 10:32 PM
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Originally Posted by mark kibort
my kinesis 18s, 9.5" wheels are a very light 19lbs and the rear 11" rims are 20lbs (very light for such a big rim. the tires can range from 25lbs to 30lbs depending on now much steel are in them.)

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Damn, I wish! Soon I will be going from 38lb/corner (17lb 16x7 S wheels and 21lb 245/45-16 Hoosier S05) to 48-51lb/corner (25-28lb Turbo II clone and ~23lb 275/35-18 Hoosier Grand Am).
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Old 01-27-2008, 01:22 AM
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I put the '07 tahoe 20" rims on my '02 tahoe, and now im running about 5mph over. they are much taller, and man, are they heavy!!!! at first guess, maybe 2x !!

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Originally Posted by FlyingDog
I've heard that GM specs their cars to read 6-8mph over at 60-65mph. Most car companies go for 3-5mph.
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Old 01-27-2008, 01:23 AM
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Where are you getting the Grand Am Cup tires? someone's throwaways or are you slipping a 928 into the Koni cup GS?

mk


Originally Posted by FlyingDog
Damn, I wish! Soon I will be going from 38lb/corner (17lb 16x7 S wheels and 21lb 245/45-16 Hoosier S05) to 48-51lb/corner (25-28lb Turbo II clone and ~23lb 275/35-18 Hoosier Grand Am).
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Old 01-27-2008, 01:29 AM
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Phil's Tire Service has 4 used. Phil's used deals rock!
http://www.nasaforums.com/viewtopic.php?f=34&t=17943

Grand Am DP and GT are Pirelli this year. I assume Koni Challenge also changed.
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