The Oxford Micro Adjust 400mm Alloy Seat Post is a reliable and versatile bike component designed to give riders precise control over saddle positioning. Ideal for upgrading or replacing an existing seat post, it offers improved comfort and adjustability for a better riding experience.

This seat post is a practical choice for a wide range of cyclists, whether you’re commuting, training or riding recreationally. Manufactured from lightweight yet durable alloy, the Oxford seat post provides a strong and long-lasting solution without adding unnecessary weight to your bike. Its robust construction ensures stability during rides, while maintaining ease of adjustment when needed.

• 400mm length alloy seat post from Oxford
• Micro-adjust mechanism for precise saddle positioning
• Lightweight and durable construction for everyday use (355g – 31.8mm)
• Compatible with a range of bike types including MTB, road and hybrid
• Available in multiple diameter sizes from 25mm to 31.8mm for a secure fit

Designed for cyclists who value comfort and control, this seat post is an essential upgrade for improving ride quality and bike fit. Pair with a bike saddle from top brands at Alison’s Biciclette for a comprehensive bike upgrade.

How to Measure the Correct Seat Post Size

Seat posts are sized by the inside diameter of your bike’s seat tube, not by the saddle or the old post length.
To find the correct size, remove your current seat post and measure the diameter of the post itself using calipers (best) or a ruler. The measurement will be in millimetres (for example: 27.2mm, 30.9mm, 31.6mm).
If you do not have the old post, measure the inside of the seat tube directly, or check the size often stamped on the old post near the bottom. Even a difference of 0.2mm matters, so please do not guess — a post that is too small will slip, and one that is too large will not fit.

Please see the diagram in the gallery for confirmation of instructions

• Do not measure the outside of the frame tube — it must be the inside diameter.
• If between sizes, always go by the exact measured size, not the closest guess.
• Length (e.g. 300mm, 350mm) affects riding position, not fit in the frame — diameter is what determines whether it fits.