Cannondale shifter boss kits

Cannondale bolt-through shifter boss kits on this page: 43mm | 47mm | 47mm used | 62cm

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An important note about how we measured these boss kits. We measured them with 1-2 threads engagement, from inside to inside.

• Early Cannondale frames had shifter bosses that bolted through the downtube because at the time, the company didn’t see a way to reliably attach them to the aluminum tube.
• Cannondale was able to patent its bolt-through solution to the problem
• This page has our stock of bolt-through shifter boss kits.

For the detail-minded, here is the patent abstract for these bosses:

"A shifter boss mounting assembly includes a member threaded at each end and extending diametrically at least partway through a bicycle frame downtube formed with openings therein, a pair of shifter boss bases with inward surfaces conforming to the downtube outer surface, and a pair of shifter studs that extend through the base and a respective opening in the downtube and thread onto the corresponding threaded ends of the member. A projection on each base cooperates with an opening or indentation in the downtube to restrain the base from rotational movement. A lock washer or a plate keyed to cooperate with the base and the stud restrain the stud against unthreading when the shift levers are pivoted. Once mounted, the boss assembly is standardized in its external configuration to bosses adapted to receive standard commercial shift lever assemblies."

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Cannondale 43mm Shifter Boss Kit. New, $85.00/each

Here's the 43mm kit.

End view

Here's the other side.

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Cannondale 47mm Shifter Boss Kit. New, $85.00/each

Side one.

From the other side

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Cannondale 47mm Shifter Boss Kit. Used, $65.00/each

Not new, but fully servicable

From a different angle

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Cannondale 62mm Shifter Boss Kit. New, $85.00/each

Side one

Side two