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According to the F300/F310 Owners manual the recommended tire sizes are 195R15, 225/70R15, 195/80R15 (for GCC). However...
The largest tire size you can fit on a US Daihatsu Feroza / Daihatsu Rocky / Daihatsu Sportrak without modification should be 30" or 29.5", any bigger and they will rub on the fenders or the wheel housing. This means the tire you want is 30"x9.50" R15 (Close to Metric 245/75R15). If you cannot fit these on the truck without them rubbing, make sure your suspension is not worn out and that nothing is sagging.
What is the difference between Metric and English?
'Floatation' tires which are used for more off-roading are usually in English. Metric tires are found more on-road. But at the same time they aren't mutually exclusive.
How do I read tire sizes?
245/75R15 means 245mm is the nominal width of tire, 75% is the ratio of height to width (aspect ratio), R stands for "Radial" and 15" is the rim diameter code.
30"x9.50" R15 means 30" tall, 9.50" wide and built for a 15" rim. The "R" stands for 'Radial'
How do you come up with 29.5"?
245/75R15
75% of 245mm (.75 x 245mm) = 183.75mm x 2 + 381mm (15") = 748.5mm (29.5") diameter
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