Cannondale bicycles often take unique or proprietary headsets. Don't worry, we know all about them and have made an effort to simplify finding headset options for your Cannondale. 

We've divided up the headsets into easy to understand categories. We have a variety of great aftermarket options where those apply as well as conversions, reducers, spacers, etc to get the setup you want for your bike. 

Our headset collection is grouped into cup diameter or bearing diameter in the case of integrated cup headsets.  

Headset Type Description
 Cannondale Si Headsets

Starting approximately in model year 2007, Cannondale simplified headsets on their bikes that used Headshok or Lefty forks. Rather than using the separate cup and bearing used on previous setups, an integrated cup in the headtube allowed a bearing to be pressed directly into the headtube reducing the number of parts and weight of the system. Different configurations of headsets allowed for different fork configurations to match Lefty/Headshok specific frames without a series of obnoxious adapters. Because these are unique to Cannondale, at time of writing, there are no aftermarket brands producing headsets to fit Cannondale Si headtubes.

Shop Cannondale Si Headsets

49mm In the beginning, Cannondale created the Headshok and the oversized headtube. Being far ahead of their time, Cannondale needed a large headtube to fit this fork in the frame. 49mm headtubes are sometimes referred to as 1.5" or ONEPOINTFIVE. The inner diameter of these headtubes is 49mm and requires a cup for a bearing to sit in. Cannondale's QHDST/EBO is the original Headshok and Lefty headset. If you want to convert a 49mm frame to use a 1 1/8", 1.5", or tapered fork, you'll need to convert from 49mm. 


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