What size tire using 15x6 wheel?

33IMP said
Excuse me, I need clarification. Op says the wheels he wants to use are OFFSET 3.375 but doesn't state clearly whether that is positive or negative, or inches or millimeters . Everyone commenting here assumes he means backspace. If that is what he meant, then head on! But offset is a legitimate but entirely different method of describing a wheel.

On a personal note, I DESPISE wheel companies that use offset to describe wheels. I can't be simply measured, it has to be calculated, and it can't even be calculated if the actual width of the rim is unknown. Please, backspace only! It can be determined exactly with just a straightedge and a tape measure.
Okay, continue !

but...... had you thought about 3.375 offset, on a 6" rim? is that even possible?
i do agree about listing backspace not offset. listing offset is about as useful as when people measure rear axles by the casing width, what about the variations in halfshaft size, brake drum/disc thickness etc. why not say wheel mounting face to wheel mounting face (or wmf for short). that's the measurement that you can work with.
neil.