Direct Answer • Key Takeaway
The Flats on Almost All Modern Pedals Take a 15Mm Spanner, Though Many Pedal Spanners Also Have a 9/16-Inch Jaw for Older Pedals. Don't Be Tempted to Use Thin Wheel Cone Bearing Spanners, as They'll Distort and Be Ruined. 4. If There's a Hex Socket It Will Be 6Mm or 8Mm.