Cane Creek 40 Series Top ZS49

Cane Creek's 40-Series Top ZS49 brings durable, precision headset technology to everyday mountain builds. Drawing design cues from the premium 110-Series, the 40-Series balances performance with value: a sealed cartridge bearing, CNC-machined aluminum parts and an anodized finish deliver long life and dependable steering performance.

The ZS49 upper follows the Standardized Headset Identification System (SHIS) as ZS49/28.6, designed for bikes with a 49mm press-fit upper cup and a 1-1/8" steerer. This top assembly is a ZeroStack (ZS) design for a low profile and compatibility with many modern frames and forks.

Engineered for real-world riding:

• Sealed cartridge bearing: smooth rotation, outstanding dirt and water resistance, minimal maintenance.
• High-grade aluminum construction: lightweight yet stiff for precise steering feedback and long service life.
• Interchangeable design: works with other 40-Series parts—mix tops and bottoms or convert assemblies to fit different frames.
• Low-stack profile: the H8 variant is an 8mm top stack for a clean cockpit and low stack height.
• Precision tolerances: accurately machined faces ensure predictable preload and neutral steering feel.

Together these features make the 40-Series Top an easy upgrade or replacement part that performs like a higher-end headset without the premium price tag.

This product is an upper/top-only ZS49/28.6 headset piece designed for frames with an internal upper cup diameter of ~49mm and a 1-1/8" (28.6mm) straight steerer. It’s a ZeroStack top, so it works with ZS49 lower cups and compatible ZeroStack forks. Cane Creek sells the 40-Series as complete assemblies or as separate tops & bottoms and offers different top stack heights for fine tuning fit.

Before ordering, measure your frame's upper headtube ID and confirm your fork steerer diameter. Installation requires pressing in cups and seating the top properly—use a headset press and follow Cane Creek's torque guidelines for the compression cap bolt (typically low Nm values, see your bike or fork manual). If you’re converting or mixing brands, match SHIS codes: ZS49/28.6 on the top and the corresponding lower cup code for a reliable fit.

The Cane Creek 40-Series Top ZS49 is aimed at mountain riders, mechanics and frame builders who want a durable, low-maintenance upper headset piece that won’t break the bank. It’s ideal for riders refreshing an older build, swapping damaged parts after a crash, or assembling a new bike with modern ZeroStack headsets.

Because of its interchangeable design and Cane Creek’s parts ecosystem, it's also a smart choice for workshop stocking—one top fits many common modern mountain frames when paired with the correct lower cup and bearings.

When buying a headset top assembly, start by identifying the SHIS code stamped on your frame or check the frame manufacturer's spec sheet. For ZS (ZeroStack) tops like the Cane Creek 40-Series ZS49/28.6, ensure your headtube accepts a 49mm press-fit upper cup and that your fork steerer is 28.6mm (1-1/8"). Decide whether you need a low-stack or taller top based on stem clamp clearance and headset cap stack.

Choose sealed cartridge bearings for low maintenance and easy replacement; pick Cane Creek 40-Series parts if you want interchangeability and value. If you’re converting between tapered and straight steerers or changing fork types, select the correct conversion top or complete assembly to avoid fit issues.