Double Butted Seat Tube & Miter Cut Top Tube

The seat tube is where all three triangles of the frame meet and it is crucial to keep this tube strong.

An internally double-butted seat tube helps achieve that goal while saving weight. A miter-cut top tube ensures a precise fit with the seat stays during welding. This increases the strength substantially over frames that use a “sandwiched” toptube at this junction.

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