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Howell-N-Mann
18"I had this rack custom built for me. The frame is ASTM grade 6 6Al/4V titanium alloy, and the bars are titanium tubing (same type) with hollow aluminum inserts to absorb and dissipate heat. The spacers guarantee that the top bars do not get too close together. This reduces the rope angle on these bars, reducing their contribution to the total friction and thereby reducing the amount of heat that they generate. These bars are oversize as well, since they still absorb more heat than the lower bars. The second bar has centering ring as well.
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This long-drop rack has a steel frame. I put six brake bars on mine, since this is enough for my weight. The purpose of a long frame is not to allow adding more bars - in fact, long drops do not require any more bars than short ones - but to allow one to space the bars farther apart at the top of the drop where rope weight is greater.
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©2007, Gary D. Storrick