unfortunatley those are too tall. i need either a 255/35/20 or 245/40/20. A quick lesson on calculating tire size for those who want to know. example 245/45/20 the first number is the width of the tire in millimeters, measured from sidewall to sidewall. to convert to inches,divide by 25.4. in the example above the width is 245mm or 9.645 inches. the second number is the aspect ratio. this a ratio of sidewall height to width. in the example above, the tire is 9.645" wide multiply that by tha aspect ratio to find the height of one sidewall. in this case 245x.45=110.25mm or 9.645x.45=4.34" the last number is the diameter of the wheel in inches. to figure the outside diameter of a tire, take the height of the sidewall multiply by 2,(remember that the diameter is made up of two sidewalls , the one above the wheel and the one below the wheel) then ad the diameter of the wheel to get your answer. example 245/45/20 245mm x .45=110.25 x 2 =220.5 +508mm(20")=728.5mm or 28.68"