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What is the most wet proof freehub design?
A fixed wheel :) All freehubs are compromised by the fact that seal drag between the rotor and the hub shell turns the sprockets forwards when you stop pedalling, leading to flapping chain and slow pick up. The interior bearing seals are OK because they have a small diameter, so the seal drag doesn't have a large moment. The problem comes at the junction between the rotor and the hub shell, where you have to create a seal that's about 35-40mm in diameter. Contact seals are better than labyrinth, and labyrinth is better than nothing.
Store the bike in a warm dry place, and pull the freehub off and clean it if you've been riding in particularly wet or filthy conditions. If you can't do that, prioritise designs which are cheap to repair.
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gbj_tester
svenhöek
Follow up question:
What is the most wet proof freehub design? ok water and salt and grit