New Stem Prototype

Many of you may know that Shawn and I have been making custom handlebar stems for a long time and in fact designed and had made a job specific fixture to make stems with several years ago.  However, until recently there were some fit and finish issues that I was not satisfied with.  The issues were twofold, the first was that the binders we were using came pre-slotted. This was a time saver on seat tubes, where the slot width seemed appropriate, but the slot was too wide for a stem.  The solutions was to find unslotted binders, which a request to one of our suppliers eventually accomplished.  The second issue was that the piece of tubing that clamped to the handlebar looked like…well, a piece of tubing- no shape.  Another supplier, Paragon Machine Works, provided the solution with a machined sleeve which tapers from an outer diameter of 31.75mm in the center to just over 27mm at the edges.  Take a look at the pictures of prototype using the new pieces.  I think you’ll appreciate the shaped clamping piece and the nice tight clamping slots.  And oh by the way, Paragon also bores the inner diameter to exactly 26.0 for a perfect fit with the handlebars.

-Bill Stevenson

Custom Stem Prototype 2, Note Again the Tight Slot and Tapered Clamping Piece (Photo courtesy of Shawn Stevenson)
Custom Stem Prototype 2, Note Again the Tight Slot and Tapered Clamping Piece (Photo courtesy of Shawn Stevenson)
Custom Stem Prototype, Note the Narrower Slot and Tapered Bar Clamping Piece (Photo courtesy of Shawn Stevenson)
Custom Stem Prototype, Note the Narrower Slot and Tapered Bar Clamping Piece (Photo courtesy of Shawn Stevenson)

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