Caster seems a little low but it could be correct. 3.0 degrees would make for a more stable vehicle with faster steering wheel return after turning a corner, but the wheel would be a little harder to turn. Toe doesn't make sense. 1.16" is way too much toe-in. A typical spec. Would be 1/8" toe-in. On most computers it would be listed as 0.12" or some people set theirs up to read in degrees. It just happens that degrees are double the reading in inches so 0.12 inches would be the same as 0.24 degrees.
The number in inches refers to the difference in the distances between the front and rear of the wheels. The number in degrees has to do with the angle the wheels are steering toward the center of the car. Either way, that is "total toe" which is the sum of both wheels. Each wheel gets half of that and it is adjusted while the steering wheel is locked in the straight-ahead position. That insures the steering wheel will be straight when you're driving straight ahead.
1.16" total toe would mean the fronts of the wheels are much too close together. That will scrub off the outside edges of both tires. Toe always results in wear on the "leading edges" of both tires equally. By "leading edge", it can help to exaggerate it to better visualize what happens. With toe-in, the left wheel is turned to the right. Now imagine it's turned more, ... And more, ... And a lot more, until it's turned 90 degrees and steering toward the right side of the car. Now it's easy to see the outer sidewall is in front. It's the first side of the tire to come down the road so it's the leading edge.
Now imagine holding a pencil upright with the eraser down and touching a table. Put downward pressure on it, then slide the eraser across the table. You'll see the leading edge scrubs off and makes eraser crumbs but the trailing edge bends and lifts up off the table. No wear takes place on the trailing edge. That's what happens to the tire tread when total toe is very high. There are other wear patterns that will occur in tires with deep tread. That is mainly a choppy pattern, but it's the edge wear that most people notice.
Excessive total toe can also make the car hard to control because it can only follow one tire with the most weight on it which is usually the right one since roads lean to the right, then it will follow the other one momentarily when it hits a bump.
Thursday, July 25th, 2013 AT 10:16 AM