I'm thinking about getting a set of Enkei Hurricane HR385s for my '86 Trans Am WS6. It currently has the stock wheels (16x8), but the Hurricanes are 15x7. My main concern is whether or not the smaller diameter will interfere with the brake calipers or the suspension.

Has anyone else done something similar? Any other things I should consider with running a smaller wheel size?

Here's what they look like on a '79-'81.

 

They should be good. The early 3rd gens sometimes came with 14 inch wheels so unless they are some weird offset, should be copasetic.

 

You should be fine if you have the stock brakes. My 90 came with 15's from the factory. The stock brakes on these cars are super tiny.