aceoffix hub freehub 16 20 hole 3-4 speed external front rear hub

7075 axis
rear hub 4 bearing
front hub 2 bearing

weight front hub 69g
rear hub 190gram

6 speed can be installed with 9s gear and 7 speed can be installed with 11s gear

big bearing is used in the hub, which greatly improves the durability.

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