Generally on cars you would not go more than 3% larger but on most trucks you can go up to 15% larger.
One of the OEM sizes for your truck is 215/65R15 which produces 800 revolutions per mile.
A 215/70R15 tire will produce 776 revolutions per mile which is only a 3% difference which is no problem.
Just remember your speedometer and odometer will be off by 3%. For every 1000 miles traveled your odometer will only register 970 miles.
A 215/70R15 tire btw is actually 26.8 inches in diameter
http://www.tirerack.com/tires/tires....7SR5RADTARWL2. I don't know where you got that 29 inch figure. A 215/65R15 tire is 26 inches
http://www.tirerack.com/tires/tires....pecs#tabAnchor
Can i put bigger tires on my 1990 toyota pick up? RWD.?
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