reverting to old style full height chainring teeth were good at keeping the chain in place,

Until forced off , intentionally.

now a days they get labeled single speed chainrings.. but they were just the common chainring type

until the index shifting engineers began making the changes.


(Pro race lore, to keep the chains from coming off, the Paris Roubaix race mechanics tighten up the chain tensions

and reduce the wrap up requirement by making the pair a 46-53.. no Alps near the Franco-Belgian border)






....