It's mostly the bearing seals, but I wouldn't be at all surprised if Novatec's 21st Century alloy had a better blend of strength/fatigue strength/corrosion resistance compared with 30 year old hubs, aluminium mills are constantly refining even cheap general purpose alloys.
It's mostly the bearing seals, but I wouldn't be at all surprised if Novatec's 21st Century alloy had a better blend of strength/fatigue strength/corrosion resistance compared with 30 year old hubs, aluminium mills are constantly refining even cheap general purpose alloys.