Largest tire for 20" rims

What's the largest tire I can run on my stock 2007 tacoma. I've got the TSS 20" rims that the previous owner put on. I've searched but can't come up with a definitive answer. Best I can tell is 265x50x20 but over all tire size max based on what I've seen is 31.5 for my truck and I'd like to get as close to that as possible. Newbie here and this can probably be answered easily. Thanks.

 

265/55/20 are 31.48 inches.

http://www.tacomaworld.com/forum/tirecalc.php?tires=245-75r16-265-55r20

^^^ Good info here

 

That's what I thought Rogue but it doesn't look like anybody makes a tires that size. I've only found 50 and then it jumps to 60...

 

Well, the 60's are almost 33's so they wont fit on a stock height truck. Check for 255/60/20. Those should fit. If not you might be stuck with the 265/50's

 

Yeah doesn't look like 255/60's are made. Guess I'm stuck without a lift. Thanks for the help.

 

After poking around I found that 275/55/20 is almost a 32" tire and a couple brands make them. Should fit a stock height truck.