Mine, fronts were at about 26K, then about 51K, every other tire change, it seems. Rear were about 32K and am going to replace again before Wing DIng at 61K.
I DONOT reuse or swap pads left/right. $40 for brakes is cheap insurance for a panic stop that might save my life!!! Not worth risking safety for 1/2 worn pads as others have posted.
Changed my rear at 12,000 miles.They were not down to the wear groove, but compared to the front they were half as thick and pedal travel was getting lower and lower. Glad I did because I found a screw lodged in the rear tire and I had a trip to the twisties scheduled the next day in WV. I had a great ride to Seneca Rocks on my new ME 880. Fronts are still the original at 23,000 and since a new set is hanging on the peg board I'm putting them on this summer