Seems it's not popular with other people, for other reasons...
https://www.youtube.com/watch?v=QcPozdqXwtg
TBF I understand this is a design that comes from FSA and is implemented by P2M rather than being decided by them. I have the P2M version of the powerbox, and there is no lip. Funny, I was watching this video last night.
@croft 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.
Seems it's not popular with other people, for other reasons...
https://www.youtube.com/watch?v=QcPozdqXwtg