It's likely to be caused by repeated low grade impact so either shoes being too small or you're foot sliding forward and hitting the front of the shoe
So you are saying they are either too large or too small?
I don't think they are too small, which leaves the sliding thing.
That said I don't think they are too large either - I'll do the laces up tighter, maybe.
@Dammit started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
It's likely to be caused by repeated low grade impact so either shoes being too small or you're foot sliding forward and hitting the front of the shoe