There is a couple of shops that tru up rims maybe they have the tool. But really buy a new tire cut 50% just buy 2 tires.
a Belt sander works - hold it at 45 degrees and it spins the tire and cuts...
This is the article I read about the importance of keeping the tires very close together in circumference:
From this and others I have read, you just can't replace a 50% worn tire on an AWD car with a new one.
If you can find a used tire that matches in every key respect, that is great.
Shaving a new tire for $35 is way cheaper than replacing all four.
The thinking is that the larger diameter tire will have that wheel turning more slowly than the rest - the potential issues come up in the transfer case (which normally is a differential) BUT - there's also the differential on each axle - so that between the two wheels on the one axle, there would be a slight compensation in driveshaft speed/rpm - which is most likely going to be a non-issue on street tires.
on Offroad truck tires that have an inch or so of tread depth, I can see a new tire with 3 well-worn tires creating havoc... but as Volko noted, we're talking about less than 1/2" (xPi, about 1-3/4" circumference) by half (7/8") from the diff... by half from the transfer, 7/16"
.... not going to do the RPM math right now.... but you can see how small an error we're getting to.
The 1/2" was circumference not radius.
Nope - DIAMETER not circumference OR Radius (it's 2r)
you're right. i missed that.
You were closer than him though!