Tire (and rim) Q, 2000 Taco

Please pardon my semi frustrated attempt to search for the (hopefully correct) answer.

2000 Taco SR5 X-Cab 4wd. Stock rims on it, they're 15s. Stock height suspension with Bilstein 4600s.

I just bought a set of 2007 (?) 16" TRD rims, and am struggling to figure out the appropriate size tires to mount. I *think it's 255 70 R16. Anyone out in lala land have some helpful input?

(BTW I also discovered that I need new lug nuts... aftermarket via Big O are ~$18 per, was $432 for the set!! But via EBay I found a set for $32. I think I just saved myself $400????)

 

Yea, I just got another set also...they're so cheap, why not?

 

Get 265/75r16 nice size and won't rub

 

stock is 265/70-16 (same as 31x10.50x15) but as @Zer0 mentioned you can go up a size with little rub at turns (full turn, certain tires)