[vujade]

the 35et represents 35 mm offset from the center of the wheel

so lets say your wheel is 7" wide, the center is at 3.5".
if you add 35mm (about 1.5" approximately) to the 3.5" then you will have about 5" of backspacing.

so that means you will have 5" of your wheel going away from your fender and 2" of wheel going towards your fender lip.

if this is on a beetle you should have no problem using these wheels. I would recommend a 205/50/15 on a 7" rim, maybe 215's in the rear, but I wouldnt go any wider then that.

if this is a ghia or t3 you will probably need a 7" wheel with more backspacing then 5", more like 6" of backspacing (a wheel with a 52et - 55et)

I hope this helps