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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.
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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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