225 is the width of the tread in millimeters. 60 is the heigth of the sidewall as a percentage of the treadwidth, in this case it is 60% the width of the tread. And 15 is obviously the diameter of the wheel the tire fits on.
U can go 265's wide without taking the quad shocks out. But if u do not have some really good control arms u are waisting your money. I got down to 1.88 60ft with street tires and got a more stable rearend.
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