LAINFELD Suspension seatpost, 27.2/30.9/31.6 mm (0.24 in)

A suspension seatpost is the cheapest way to take the edge off a harsh ride, and the adjustment is what makes it work.

What the manufacturer publishes

A suspension seatpost made from high-quality material. Adjustable spring hardness, so the spring rate can be set. Adjustable seat angle for sitting comfort. A 350 mm (13.8 in) length supplied with two hex keys.

The spring rate, which is the whole point

Suspension only works when the spring is matched to the load on it. Too soft and it compresses under pedalling, which wastes effort and feels vague. Too hard and it never moves, which is a heavy rigid post.

A fixed-rate post is right for one rider weight and wrong for everyone else. An adjustable one covers the range, which is why it is worth the difference.

The height that moves

Because the post sags under load, the saddle sits lower with you on it than off it. Set your height sitting on the bike, and expect it to feel slightly different from a rigid post at the same measured height.

The alternative to consider first

A wider tire at lower pressure does much of the same job for less money and with no moving parts — if your frame has the clearance. Many riders find that the cheaper change is enough.