21k for 31000 miles is a steal! Check out these tires - they are available in 20"!

http://www.tirerack.com/tires/Sizes....rrain+T%2FA+KO

They will be a little louder, but youll be able to traverse some great roads up in the sierra! Enjoy the ride.

 

For the record, I paid $21,200 for mine (also 31k miles).

Thanks for the tip on the tires! I'm guessing my rims are 20"X8.5". The tires are 265/50R20. Not exactly sure what other tire sizes will fit these rims. The Tire Rack doesn't list a 265/50R20 for the BFGoodrich T/A KO.