Why would the recess stop them working?
It buggers up the chain line becasue the P2M spider sits on a bit of chainring which is supposed to clear the spider on the OE cranks.
@Hovis 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.
Why would the recess stop them working?