With the outter fender rolled and nothing done to the inside, my 15x10's 6.5 backspacing rubbed over bumps (on the outside). It was less after I switched from 295 50's to 275 50's Nittos. That's a 90 LX with all stock suspension/drivetrain.
I have a 89 coupe with 15x10 6.5 monocoque rims on MT 28x10.50 let me tell you it was a pain the ass to fit. Beat the wheel wells rolled the lip. Coming down my drivesway that's up a hill the tire rubs the outside on quarter lip when backing down my driveway other than thay they fit but took some beating and grinding that's forsure.