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Old 11-06-2010, 08:38 AM   #9 (permalink)
ShadeTreeMech
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The Van - '97 Mercury Villager gs
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Quote:
Originally Posted by CapriRacer View Post
Unfortunately, for passenger car tires, that is only true at slower speeds. RR climbs exponentially at higher speeds. 50 mph seems to be the breakoff point - which is also unfortunately within normal driving speeds.

I suggest you add a note that the RR part is only true below 50 mph and explain what happens to RR at higher speeds.
What causes increased RR at higher speeds? Is it due to more heat buildup from tire deflection at such high rpms?

And I noticed you excluded other tires such as truck tires. The main difference coming to mind is the thicker sidewalls and tread of a truck tire vs a passenger vehicle.
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Quote:
Originally Posted by jamesqf View Post
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.
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