Ok, I'm ordering new wheels and tires and I have no idea what sizes to buy.

The wheels are 15's but I dont know what offset to get [i honestly dont even know what an offset is]

Then I'll need to order the tires too, I'm going with Yokohama ES 100's. I'll be ordering everything as soon as i get an answer.

I have a lowered 93 Civic Coupe. The options for the offsets are 38 and 40. Which would be better?

 

How wide are the rims? You're probably better off getting the 40 offset rims. Depending on the width of the rims, you could either get 195's or 205's. ES100's are very nice tires.

 

if you're getting a 15x7" rims i'd get a 45mm or 42 offset. 15X6.5" 40mm

 

205/50-15 all the way