Main Vertical Rail
1"x6" Aluminum
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Horizontal and Vertical Rails
Back view of the horizontal rail showing the lap joint.
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Main Rails Assembled
The 1/2" countersunk cap screws lock the joint.
The bottom bracket post hole is centered on the back edge of the veritical rail to make measuring chain stay length easier.
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Bottom Bracket Post and Collet Pieces
The tubing fitting on the right of the post is for argon purge
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Closeup of the Bottom Bracket Collet
When the bolt is tightened the tapered washers expand the collet and center the bottom bracket.
The washer is used to center 68mm BBs and is removed for 73mm BBs.
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Bottom Bracket Collet - View 2
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Bottom Bracket Collet Assembled
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BB Post and Seat Tube Rail
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BB Post and ST Rail Installed
The seat tube rail pivors on the bottom bracket.
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