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I have run as much as 2° negative and STILL worn out the outer part of the tread first. But, then, I am an animal.

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ANIMAL!!

Present and attending.



This darn mountain of gravel got in my way last time at the track. Picked out rocks stuck between my rim and tire for a month.

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I like lots of positive caster but not more than 2.5 to 3 deg. or so. More is better for road racing as long as there are no REALLY long high-speed straights -- excess caster makes the car pretty spooky at very high speeds. Caster is somehow hard for a lot of guys to conceptualize. Picture a line drawn between the center of the ball joints. If this line is viewed from dead-ahead of the car, you're looking at steering axis inclination (not independently adjustable). Viewed from the side, this same line is caster.

Rick

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I gave up like 5.5 degrees for 4.5 degree of caster to get that 1.5 negative camber for my last alignment. Just because I thought the benefits were greater.

Rich, what is going on at high speeds that over 3 degrees caster affects the car?? Is assume that's 110 mph plus.

I know from our circle track cars that caster will change the scale readings and weigh bias in a corner when you are turning. You can see that when you turn a car and the fenders go up and down.

Books say caster is only needed for production type heavy sedans. Real open wheel racecars don't run much or any.