I track mileage on mine. I use SportTracks, but for those who don't use a fitness app, it's easy enough to keep a spreadsheet of all your wear items - chain, cassettes, tires, cables, and cleats, and just remember to enter mileage periodically. I typically get around 3,000 miles out of my right cleat, the one I unclip first, and 5,000 miles from the left.