98 HX wheels on a 94 EX

So my friend and I were going to trade wheels for the week because he wanted to see if his 1/8 mile time would improve if he was riding on my HX wheels. Pretty good idea, huh? Well, it didn't go exactly as we planned. We got his 17" Enkei's on my car, and got my stock 14" Enkei's on his. I was about two blocks down the road when he told me to come back. Turns out the brake calipers on a 94 EX are a little bigger than a 98 HX's. The calipers were grinding up against the rim. It was awful. An afternoon wasted.