Im thinking of running 15" on the cooper i dont race it but the wheels i want dont come in any other size. My question is what suspension should i look at to lessen the wheel gap??

You can change the spring package to lower the car, but it is not really a wheel size issue unless you also elect to change to a much different tire aspect ratio. Smaller wheel, taller tire, same overall diameter (more or less).

Yeah im going to a lower profile tire. I'm not going to be running on ballons. Thats why i asked the question.

I think the H-sport lowering springs might be the best, unless you want to go to coilovers, then I'd go with the KW V1's would be my 1st choice. The spring rates are such on the H-Sports that they may save you the cost of a rear swaybar as well. The best choice of tire sizes would be the 205/55/15 to maintain oe tire diameter and I wouldn't call those ballons but once you go to a 205/50/15 and lower the car enough to have a decent looking tire gap you're getting pretty low. I'm talking about watching out for speed bumps and being very careful at driveway entries and exits.

If I was to run 15's, I would keep my H-sports and run 205/50/15's (azenis sports).

Ah, I'm confused. Tire profile is determined for you no matter what wheel size you choose. You may elect to purchase a wider than stock 15" tire, but the actual profile size will remain the same - assuming you don't want problems with your speedometer, acceleration etc. The tire may read as a lower profile, but the profile size is a percentage of the width of the tire. So, the gap will reamin the same with 15", 16", 17" and 18" wheel and tire combos if you follow the correct plus sizing, and you should. Never select a suspension set-up to correct for wheel well gap. That is simply the wrong way to do things of this sort.

OK