I have 16" rims because of my disc brakes, long story. At the time I bought the 16" rims there were more choices for 16" tires than 15." That has changed. I have owned two set of BFG T/A in years past on a 67 Mustang and a Ford Ranger truck. They look good but they are dangerous tires on wet streets. I bought a 06 Mustang that had BFG G-Force tires on it. I drove it home and got on the Internet looking for tires. But after I drove it for a few weeks, some in the rain, I bought a pair G-Force KDW for my Cobra. Great street tires. I have about 4000 miles on them and love them. We drove 75 miles in the rain on the return trip from the London Cobra Show. The tires performed superbly. If you want a good "street tire" you should look at the G-Force.
They do not have that fat tire look that fills the wheel well on a Cobra.
Dwight
PS they have Mustangs doing 145 mph in the 1/4 on G-Force tires