4. We like about 3 to 5 degrees of positive caster. This means that at ride height the top of the C is leaned back 3 to 5 degrees. Any more than 10 degrees is excessive and less than 2 is not enough. The True Hi 9 should not have a pinion angle raised over 5 degrees up from level as that could inhibit the oiling. We decided to go with 4 degrees of positive caster and 4 degrees of pinion angle; this will allow us to rock the pinion down if need be, resulting in more caster. The camber is determined by the press fit of the inner C on the tube, though we can adjust it slightly when welding.