27.2 Seat Tube – 350 mm Aluminium Alloy Bicycle Seat Post Replacement

This 27.2 seat tube is a durable, lightweight replacement seat post designed for riders who want a reliable and smooth saddle fit. Made from strong aluminium alloy, it fits most road, hybrid, and mountain bikes that use a 27.2 mm seat post size. With clear adjustment markings and a 350 mm length, it helps you achieve the perfect saddle height for comfort and efficiency.

Why You Might Need to Replace Your Seat Tube

Over time, seat posts can become scratched, bent, or corroded—especially if exposed to water or grit. Replacing your old post improves safety, restores a snug fit in the frame, and allows fine-tuning of your riding position. A fresh 27.2 seat tube also ensures smoother adjustment for bike-fit changes or component upgrades such as new saddles or dropper posts.

How to Choose the Right Height

Correct seat post height is vital for efficient pedaling and knee comfort. When seated, your leg should have a slight bend (about 25–30°) at the bottom of the pedal stroke. Always insert the post beyond the minimum insertion line marked on the shaft. This prevents stress on the frame and avoids cracks around the seat collar. With a 350 mm total length and 78 mm minimum insertion, this post provides ample adjustment for most riders.

Key Features of this 27.2 Seat Tube

• Made from strong yet lightweight aluminium alloy (AL6061-T6).
• Standard 27.2 mm diameter fits many road, hybrid, and MTB frames.
• Seat clamp mount diameter: 22 mm – suitable for most standard saddles.
• 350 mm total length with a clearly marked scale for accurate adjustment.
• Minimum insertion: 78 mm for safe fit and structural integrity.
• Matte black anodised finish resists corrosion and looks clean on any bike.

Specifications

• Material: Aluminium Alloy (AL6061-T6)
• Colour: Black
• Tube Diameter: 27.2 mm
• Seat Mount Diameter: 22 mm
• Length: 350 mm
• Minimum Insertion: 78 mm

Benefits

1. Restores a secure and comfortable saddle position.
2. Improves power transfer by maintaining correct saddle height.
3. Lightweight alloy construction reduces overall bike weight.
4. Durable finish protects against scratches and corrosion.
5. Easy to install – ideal for DIY maintenance or professional setups.

Common Questions

• Q: How do I know if this 27.2 seat tube fits my bike?
  A: Check the number printed on your current seat post or measure the inside diameter of your bike frame’s seat tube – it should read 27.2 mm.
• Q: How deep should I insert the seat post?
  A: Always insert it at least to the minimum insertion mark (78 mm) to avoid frame damage and ensure stability.
• Q: Can I cut the seat post shorter?
  A: Yes, you can trim the post if necessary, but always leave at least the minimum insertion length inside the frame.

Summary

The 27.2 seat tube offers a solid, safe, and affordable replacement for worn or corroded seat posts. With a lightweight alloy build, precision markings, and corrosion-resistant matte black finish, it’s an ideal upgrade for any bike in New Zealand needing a reliable seat post replacement.