what is the factory tire size of an SR5?

[CHOP MEAT]

On the id tag on the inside of the drivers door, it states 225/70/15's, but my T4R has 16" rims. I bought it used, it is a 2000 SR5 4WD 3.4L Auto (6 Lug Wheels)- it currently sits on 265/70/16's. Just wondering, because several of my friends have different yr models and different trim packages, but all of them ride on 15" rims with 5 lugs. I have been shopping for tires and ran into this and no one has been able to answer this question for me. Also I have no manual to back up my theory that the SR5 package had something to do with the bigger wheels?

I would be thankful for any advice, thx - CHOP...

 

[CJ3Flyr]

Try this
http://www.top4runners.com/runhist/runhist32000.html

 

[VBRunner]

What was the make of the tires sold on a 2006 4runner?

Would Micheline be a better tire for fuel economy and longer life? I mainly travel the highways, so would this be a better pick for a better ride?