Dia-Compe ENE Ciclo CLA-1 Threaded Headset (ITA)

You can always rely on Dia-Compe. The ENE Ciclo CLA-1 is a classic threaded 1-inch headset with modern sealed cartridge bearings—a great choice when building or refurbishing an older road, touring, or track bike and you want to retain the traditional construction without giving up a low-maintenance bearing.

The cups are made from 6061 aluminum to keep the weight down and feature a silver anodized finish. The headset uses sealed angular contact cartridge bearings and weighs approximately 95 grams.

This version is Italian 1-inch standard (ITA) with a 1" x 24 TPI thread, 26.4 mm crown race, and 30.2 mm internal diameter in the frame’s head tube. Italian and British/ISO 1-inch threads have the same pitch but differ in thread profile: Italian uses 55°, while ISO uses 60°. In practice, they may fit the same threaded fork, but we recommend sticking to the standard already used on the fork and avoiding switching between them. It does not fit French-threaded forks.

If you are unsure which headset your frame and fork require, it is worth measuring before ordering. Differences of a few tenths of a millimeter matter greatly with older headset standards.

Quick Specs

• Product type: Threaded headset
• Size: 1 inch
• Standard: Italian / ITA
• Thread: 1" x 24 TPI
• Fork steerer: 25.4 mm
• Crown race: 26.4 mm
• Frame head tube internal diameter: 30.2 mm
• Upper stack height: 26 mm
• Lower stack height: 11 mm
• Bearings: Sealed angular contact cartridge bearings
• Cups: 6061 aluminum
• Adjusting cone: 32 mm
• Locknut: 32 mm with seal
• Weight: Approximately 95 g
• Finish: Silver anodized
• Does not fit: French-threaded 1-inch forks
• Important: Check the frame and fork headset standard before purchase