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The Elan hub
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This picture may not do justice to the size of the hub. The left flange is 105 mm in diameter, as large as on an old Sturmey-Archer Dynohub. The right flange is 132 mm in diameter. The sprocket was available in one size only -- 26 teeth. Still, the hub demanded a small chainwheel, typically 38 teeth, because of the large increase ratio to the top gear. The spoke holes are oversize, 2.6 mm, to make it easier to get spokes in the left flange past the right flange.
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