Quote:
Originally Posted by 57chevyragtop
Yes I thought you might have 16" wheels on your truck. However I would guess you have a taller sidewall than a passenger tire 225-60-16....also consider my toe spec is 0.10 deg. (read one degree). I do not know the spec on your truck. If 0.10 deg. you are probably right on @ 1/4" depending on where you are measuring. The mfg. spec is for the center of tire at tread diameter. A taller tire will account for the difference.
Now if you lay it out on paper you start by laying a line the length of the radius from which you are going to measure on the vehicle i.e. (center of wheel to front lip edge) Mine measures 8 5/8" or 219mm. Then using a protractor centered at the start of the line draw your deg. line out then measure the distance between lines 1/8th inch = 3.175mm.
I don't think it a good idea to use tread as a measure point due to possible run out in tread design tire to tire. This is merely an opinion on my part
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I do not know about this tread you say . the wheel is used to provide the toe as I have done this. the alignment I use Is with using a line from the rear to the front then adjust the wheel for the toe of 1/4 inch same on both sides steering wheel exactly straight. I place two steel plates under the wheel on each side . with grease between these plates , the wheels move very easy . then adjust the tie rod for the proper toe. then move steering wheel a few times and recheck.
using a cut piece of wood on the wheel rim to stick out beyond the tire at the center point allows all this to be very accurate.
now I am with this procedure for almost 20 years now and my tires wear really even.. like I stated before they all are worn the same all worn same amount across the total tread surface ..
my truck tires first set from the factory had 92K miles on them and 70% worn. the tires now 2nd set , have 60K on them and are 60% worn more wear because these tires now are 8 years old !!