Tacoma Wheel Size

My first post and i hope that someone can help. I just bought a 45K mi 96 Tacoma Xtra Cab. The original wheels/tires are 215/70-14. I'd like to install something in a 15 or even 16" size. Is there a factory upgrade wheel from Toyota that will fit the 5 bolt pattern? I looked on eBay and everythin seems to be for a 6 bolt pattern.

Also I believe that the wheel/tire size effects the computer and tranny shifting. How much larger (wheel/tire) can I go before something needs to be re-programmed.
Thanx for your time.

you must have a 2 wheel drive.
You can keep your 14 inch wheels and get large enough tires to do anything you want. Plus tires for the 14 inch size are cheaper, generally speaking.
I know, for instance, that BFG makes a mud and a/t tire in 28x9.5 r 14. This would be a good increase over your current size and give you a bit more clearance as well. Should have no affect on power/computer/transmission characteristics, etc.

By the way,
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