FSA Duron X EC30/25.4 - EC30/26 Threaded Headset

Item number: 7455
  • 100 day return period
  • Online since 1998
  • Trusted Shop 4.89 / 5.00
The FSA Duron X is a silver 1" headset for Italian thread forks (22.2 x 30.2/26.4 mm).

Use: for 1" up and lower head tubes combined with standard 1" forks.


Application: Road, Cross Country, City
Upper Cup: 1"
Lower Cup: 1"
Pitch: 24 tpi
Steerer Tube: 1"
Design: external cup (EC)

Technical Information:

Material: aluminium
Bearings: Angular contact ball bearings (36°/ 36° ACB, top)
Upper Insert Depth: 10 mm
Lower Insert Depth: 10 mm
Upper Stack Height: 27.5 mm
Lower Stack Height: 13.1 mm
Upper Outer Diameter: 30 mm
Upper Inner Diameter: 25.4 mm
Lower Outer Diameter: 30 mm
Lower Inner Diameter: 26 mm
Seals: black seal


- forged and CNC-fabricated bearing cups
- aluminium threaded nut
- total axle to crown 40.6 mm

Standardized Headset Identification System (S.H.I.S.):

In order to clarify and bring uniformity to a sea of headset standards, manufacturers Acros, Cane Creek, Hope, Race Face, Reset Racing and Ritchey have agreed upon using a shared nomenclature, which will likely include more participating companies in the future. This system takes into account a combination of frame and fork dimensions. Both the upper and lower part of the headset are marked by two alphanumeric identifiers. The first identifier indicates the type of headset (External Cup, Zero Stack, Integrated) and head tube diameter. The second identifier - separated from the first by a backslash - indicates the diameter of the steerer tube. When referring to a complete headset, the specifications of both upper and lower parts must be combined.


EC: Bearings contained within cups that are located outside of the frame (external cup).
ZS: Bearings contained within pressed-in cups where the cup and bearings rest inside the frame (zero stack).
IS: Bearings that fit directly into a bonded or machined interface that is integrated into the frame (integrated).

Manufacturer Number:

EC30/25.4 - EC30/26: 121-1400


- 1 x FSA Duron X upper headset cup, incl. bearings
- 1 x FSA Duron X lower headset cup, incl. bearings
- 1 x nut
- 1 x crown race


  • silver/EC30/25.4 - EC30/26: 94 g


  • silver/EC30/25.4 - EC30/26, in stock

Rate this product

Be the first and leave your opinion!

Customer Reviews

no reviews yet

Your opinion counts!

Be the first and leave a comment!