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I agree with this and just happened to see a TV show over the weekend that said basically the same thing:
Originally Posted by Gearhead Jim
Be sure to give the tech some specs to shoot for. On a C6, road force numbers:
20 is too high
15 is acceptable but could be better
10 is excellent
I had a guy who was satisfied with a RF of 22 on one of my tires, couldn't figure out why the car was vibrating. As someone said, you can have a square that is perfectly balanced but it won't roll very smoothly.