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Hi, Dave.
Yes, you're right about the thrust angles on the rear axle -- it can't be adjusted.
But, and I may be wrong so I would like you to explain, can't the two front wheels (i.e., both of them) be aligned not only to each other but also to the rear axle? That is, if we assume the worst case scenario of a bent frame, with a wheel re-alignment, the fronts may not be exactly centered with the rear axle's center "line" of its thrust (I hope you know what I mean), but they will be aligned to it, right? In other words (and putting toe-in aside for a moment), at least all four wheels can be made to be pointed in the same direction, right? This would eliminate some premature tire wear from slip and scrub, right (even though the fronts may be a little to one side or another)?
No big deal, but I was just wondering about this.
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