When fitting larger tires, as in 305/55R20 on a Tahoe, is the Toe-in setting typically changed for better on road handling ?
Say a vehicle had really good manners with stock 265/70R16, and toe-in set dead on ZERO.
Would one expect an 1/8" or so of toe in help stabilize the wider tires ?
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I am not able to measure toe in degres, but I do have a tape measure, so I can adjust increments down to 16th inch.
What is a good spec to shoot for ?

 

You want to zero out toe or up to 1/8th toe in. I haven't heard of toe'ing the wheels in to compensate for wider tires. I don't think you'll see much of a difference between 0 and 1/8" in, but you will notice dartiness with any sort of toe out. I've had great results with my toe plates, the toe is always 100% spot on when I take the vehicle into the alignment shop (caster and camber another story):

https://www.summitracing.com/parts/a...FcZhfgodu3MK7A