i just replaced a very used set of 31" AT moved up to a used set of 33x12.50x15 trail buster radial apr's and they dont even = any where near 33" more like 31 sumthing

 

maybe theyre just worn down, how used are they?

 

what tire shop allowed you to mount a 33x12.5 on a 6" wide rim????
they should be shut down as no reputable shop would have allow that. Sure you don't have a 7 or 8" wide rim? The rims in your avatar look to be 8" wide. Mounting that wide of tire on that narrow of a rim would cause some serious ballooning...

there is a big variation in tires. measure the rolling distance of the tire to compare (just take a tape and wrap it around the 33's and compare that measurement to the one you got for the 31's)

 

their worn down about with about 35% maybe 40

 

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