Going back to the early years of Headshok and Lefty, Cannondale standardized the head tubes on their mountain bikes that would use their proprietary forks. The 1.5″ standard head tube only varies from the information about the Cannondale 1.5″ head tube when the raw frame is shorter or longer than 4.5″. When evaluating clamp spacing needs, be sure to factor in bearings, cups, crown race, and any other required seals or spacers. The clamp spacing on the Lefty is the only factor that would make it impossible to use on a 1 1/8″ head tube. For the purposes of this document, 1 1/8″ head tubes can only use forks with 1 1/8″ steerer tubes and have some available compatibility with Cannondale’s Lefty fork when used with a conversion kit. Search Google or Wikipedia for more information about these types of headsets as there is a wealth of knowledge out there already. The measurable internal diameter of this will vary with style. Some require traditional press-in cups, others have cups integrated into the frame so the bearings go directly into the head tube, others use zero stack headsets. The actual internal diameter for this style head tube is 33.9mm when used with press-in cups. Many bicycles have had a standard 1 1/8″ style head tube for many years. View chart in new window 1 1/8″ Standard Head Tube There is a little bit of explanation of each column and row header below the chart. We have put together this chart to help you determine what headset you need to match your fork to your frame. Back when 1″ steerer tubes were common, Cannondale was running 1.5″ frames and a single size that is still relevant today. Standardized forks and headsets on mountain bikes are one of their greatest victories over less innovative companies. Cannondale has been ahead of the game for many years in a number of areas.
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