A selection of headtube lug for frame builders. Manufactured in Taiwan by Allotec, a foundry which makes steel frame parts using the lost wax investment casting method. Please see diagram and details spec in the manufacturer's catalog.
F331 Tube:25.4x31.8mm Angle: 73.5°
F330 Tube:28.6x31.8mm Angle: 60°
F340 Tube:31.8x31.8mm Angle: 60°
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