If you can get them in 15x8 and they're significanly cheaper then getting some new 16s then I'd say go for it. 225/50-15s are a nice size and theres tons of cheap tires available in that size. Unfortuantly if you want to go wider theres not much available and you are almost an inch shorter then stock diameter with that size. I like that though, I think the stock tires are too tall, and if you combine a 4.1 diff with a 4.3 speedo gear and 225/50-15s you should get an accurate speedo and odometer. I'm all 15s on my 85 and I'm quite happy with them.