Ritchey Logic External Cup Threadless Headset 1-1/8-Inch Black — Lightweight 156g, Durable Steel Bearings

The Ritchey Logic External Cup (EC) threadless headset is a lightweight, durable 1-1/8" replacement headset that pairs a smaller upper bearing for weight savings with an oversized lower bearing for load-bearing strength.

This headset is built for riders who want a reliable, simple head assembly for road, cyclocross, or light mountain bikes using a 1-1/8" threadless steerer and EC34 cups. Ritchey engineered the Logic EC to combine steel construction with carefully sized ball bearings and deep cups so the cups press in securely and the bearings run smoothly under varied loads. It comes with the top cap and is supplied in an understated black finish that matches many frames and forks.

What are the main technical differences that matter on the road?

The Logic EC uses a smaller upper bearing (5/32") to trim grams where vertical load is lighter and a larger lower bearing (3/16") where steering and shock loads concentrate. Deep bearing cups ensure solid insertion into the head tube and help maintain alignment over time.

• Headtube ID: 34mm with EC34 upper and lower cup sizing
• Upper bearing: 5/32" retainer ball-bearing for reduced weight
• Lower bearing: 3/16" retainer ball-bearing for durability under load
• Stack height total: 28.9mm (upper 15.7mm, lower 13.2mm)

How does it fit my bike and fork?

This headset fits frames and forks designed for EC34 cups and a 1-1/8" threadless steerer. Measure your head tube inner diameter and the steerer to confirm compatibility; the S.H.I.S. codes read EC34/28.6 upper and EC34/30 lower to match common 1-1/8" systems.

• S.H.I.S. upper: EC34/28.6 (fits 1-1/8" steerers)
• S.H.I.S. lower: EC34/30 for standard crown race interface
• Confirm head tube ID of 34mm for correct cup insertion
• Includes top cap for clamp and preload setup

What materials, weight, and durability can I expect?

Constructed from steel and durable plastic components, the Logic EC emphasizes longevity and predictable wear characteristics. At approximately 156g, it strikes a balance between lightness and strength while the retainer ball bearings reduce play and maintain smooth steering feel.

• Material: steel and plastic construction for strength and serviceability
• Approximate weight: 156g for the complete headset
• Bearings: retainer ball-bearing design for consistent rotation
• Finish: black color that resists visible wear and matches many frames

How easy is installation and maintenance?

Installation follows standard press-fit EC cup procedures and a basic headset pre-load sequence using the included top cap. Periodic cleaning and regreasing of bearings will prolong service life; individual bearings and cups are straightforward to service or replace as needed.

• Deep cups for reliable press-fit into the head tube
• Top cap included for immediate preload adjustment
• Standard ball-bearing setup allows routine regreasing and parts replacement
• Compatible with common headset tools and press-fit equipment

Who is this for: The Ritchey Logic External Cup EC is aimed at riders and mechanics seeking a sensible, serviceable headset for frames with EC34 head tube sizing and a 1-1/8" threadless steerer. It works well for road, gravel, and light off-road builds where you want a dependable steering assembly that balances small weight savings with a durable lower bearing and straightforward maintenance.