I just ordered two tires but only one was sent because the company ran out. Now I have options. I currently ride 28's and wanted to give 25's a try. The front 28 is in pretty good shape and has quite a few miles left on it. The rear is showing much wear (the reason I'm replacing the tires). Well now I can either send the lone 25 back and just place a new order for something different, or I can mix the tire sizes using the good front 28 and the new 25. They are the same tire, just different sizes.

Should I mix or send it back?

If I mix, should I go with the larger tire on the rear or front? I ride 50% nice highway shoulder with a few patches of rocks and debris on the road and 50% city with a few potholes and deep cracks. I only cary about 10 lbs. in a messenger bag and like to go for speed when I can.

What do you think? Mix? Wide Rear/Narrow Front? Narrow Rear/Wide Front?