00-05 focus suspension specs.
Ford has a relatively broad spec range for camber and toe settings on the Focus. Toe is however the only adjustable perimeter. Most alignment techs will only set specs within the allowed/given range aka the "green" area indicated on the alignment racks monitor. They rarely care about the potential impacts of some combinations of those settings. There are some combinations of "allowable" camber and toe that are just as bad as an out of spec setting. Too much toe, combined with moderate amounts of "in spec" camber, has proven to EAT tires. To compound these matters, when you lower your car, you also end up modifying the suspension geometry (which tends to increase camber) at the same time. Ford also seems to deliver foci with ample amounts of camber (toward the upper limits of allowable negative camber) from the factory. This amount of camber, however, tends to have more impact on rear tire wear than the front. In other words, camber is better tolerated up front than in the rear. Ford over the last few years has recognized that their original spec range was too broad and has adjusted some specs (camber in particular), especially for the rear, but at the same time still hasn't provided a way to adjust it.
For most Foci (especially 00 to 05) the following specs work. For 06+ cars these specs also seem to work, but rear camber (per Ford), should not exceed -1.3 degrrees:
Front toe: .01 to .02 inches of "toe-out" but no more (zero toe if you have poly bushings)
Rear toe: .04 inches of "toe-in" (per side)
Front Camber: anything "within spec".... its non-adjustable.
Rear camber: -1.0 to -1.5 degrees (you can go less without problems but some negative camber tends to improve handling characteristics). More than -1.5 degrees and you start to promote inside edge tire wear especially if your toe setting exceeds what's recommended above.
NOTE: If you already exceed the rear camber settings recommended above, you will need an aftermarket adjustment devise like camber bolts or adjustable upper control arms to reduce it as it's non-adjustable from the factory.
Information is courtesy of Geezer on FF.