Originally Posted by Jipe

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But the disc front hub is specific for the Birdy, you cannot use any standard 100mm wide hub because the disk won't be at the good position (the front disc of the Birdy is not only on the right side of the bike instead of the left side as usual but its distance from the center of the wheel is also different). There is a special Birdy disc from Hubsmith, there is also a special Birdy disc Shutter Precision dynamo hub.