The quiet math
behind better shoes.
A small library for runners who want clearer mileage, smarter rotations, and better replacement timing without turning their shoe closet into a spreadsheet.
Five decisions shape the life of every running shoe.
The pages below are arranged like a runner actually thinks: first know the mileage, calculate the timing, understand lifespan, balance the rotation, then let sync keep the log current.
Track mileage by shoe
Give every pair its own odometer and stop guessing which shoes absorbed which miles.
Calculate replacement timing
Estimate the date a shoe will hit its target based on weekly mileage and rotation size.
Know when to replace a pair
Turn mileage totals into replacement timing before the midsole quietly fades.
Build a smarter rotation
Keep daily trainers, workout shoes, trail shoes, and long-run pairs in the right lanes.
Connect Strava to your shoes
Let synced activities keep shoe mileage current without rebuilding your log by hand.
Frequently asked
Start with mileage. Once every shoe has a reliable total, lifespan and rotation decisions become much clearer.