PRO Cartridge headset upper - ZS44 / 28.6 mm
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Product Information
Full details
This PRO Cartridge headset upper is designed for cyclists seeking a durable and precisely engineered component for their bike's front end. Its key benefit is the high-quality, double-sealed stainless steel bearing system ensuring longevity and smooth steering performance, even in demanding conditions. A potential caveat for users to consider is its specific ZS44/28.6mm sizing, requiring compatibility checks with your bicycle frame and fork steerer tube.
All features
| Model Part Number | PRSHS0035 |
|---|---|
| Brand | PRO |
Extended Product Information
FAQs
What does ZS44 mean?
ZS44 refers to a 'Zero Stack' headset standard where the cups are pressed into the frame, and the internal diameter of the head tube is 44mm. This design can offer a lower stack height compared to integrated headsets.
Can I use this headset with a tapered steerer tube?
No, this specific model is designed for a straight 28.6 mm (1-1/8 inch) steerer tube only. It is not compatible with tapered steerers.
Do I need any special tools for installation?
Yes, professional installation using a headset press tool is highly recommended to properly seat the cups. A torque wrench is also useful for correct bolt tensioning.
How long will these bearings last?
The double-sealed stainless steel cartridge bearings are designed for durability and longevity. Lifespan depends heavily on riding conditions, maintenance, and proper installation, but they offer superior resistance to wear and corrosion compared to standard headsets.
What is included with this headset?
The product includes the precision machined anodised alloy cups, the double sealed stainless steel cartridge bearings, and a machined alloy gap cap, bolt, and star nut.
How do I maintain the headset?
The sealed bearings require minimal direct maintenance. Clean the exterior of the headset after riding in adverse conditions. Avoid high-pressure washing directly onto the bearing seals. If issues arise, professional servicing or replacement of the cartridge is advised.
Troubleshooting
Headset feels notchy or stiff
The bearings may be contaminated or damaged. Ensure the seals are intact. If contamination is suspected, professional servicing or replacement of the cartridge bearings may be required.
Play in the headset (loose feeling)
Re-adjust the headset's top cap bolt to properly pre-load the bearings. Ensure the stem bolts are also securely tightened to maintain alignment.
Cups are difficult to press in
Ensure the head tube is clean and free of burrs. Use a proper headset press tool. Do not force the cups; consult a bike mechanic if resistance is excessive.
Noise or creaking from the headset area
Check that all components are correctly installed and greased. Ensure the headset cups are fully seated and the top bolt is properly torqued. Creaking can sometimes originate from the stem or fork interface; ensure these are also clean and properly secured.
Pros and Cons
Pros
- Enhanced durability due to stainless steel bearings.
- Smooth and reliable steering performance.
- Corrosion resistance from sealed bearings.
- Includes all necessary installation hardware.
- Lightweight yet strong alloy construction.
Cons
- Specific sizing (ZS44/28.6mm) limits compatibility.
- Requires precise installation to function optimally.
- May be more costly than basic headset options.
Setup, Compatibility & Care
Compatibility:
This headset is specifically designed for:
- Head Tube Standard: ZS44 (Zero Stack, 44mm internal diameter)
- Fork Steerer Tube Diameter: 28.6 mm (1-1/8 inch)
Ensure your bicycle's head tube and fork steerer tube match these specifications before installation. Professional installation is recommended to ensure proper seating and alignment.
Setup:
- Clean the inside of the head tube thoroughly.
- Press the alloy cups into the head tube using a proper headset press tool.
- Install the bearings into the cups.
- Insert the fork with the steerer tube through the headset.
- Install the gap cap, compression ring (if applicable), and stem.
- Insert the top bolt through the stem and into the star nut (pre-installed or installed into the steerer tube).
- Tighten the top bolt to pre-load the bearings, then tighten the stem bolts.
Care:
While the sealed bearings require minimal direct maintenance, occasional cleaning of the exterior components is advised. After riding in adverse conditions, wipe down the headset area. Avoid high-pressure washing directly at the seals. If any play develops, re-adjust the headset rather than over-tightening, which can damage the bearings.