Pin seatpost: a brief description

Walking on a bicycle or playing sports directly depend on the ease of use of the product. Saddle - one of the five human contact points with two-wheeled machine. Create a comfortable environment helps drive the seatpost. Matter of choice model, each for himself defines itself. It all depends on the specific conditions of cycling and financial capabilities.

The

Seatpost have two main functions:

• with the help of a saddle attached to the frame;
• It allows you to individually adjust the saddle height and inclination with respect to the frame.

These two parameters directly affect the ease of landing and getting the maximum efficiency. Design pins can be different, but they share common principles of the device. In the upper part is bound to have a lock for locking the saddle rails. Pin itself is inserted into the seat tube of the frame and is secured by a clip:

to

• eccentric, it is easy to tighten or loosen, making the seat height adjustment or removal is very simple;
• a bolt, for its adjustment would require a special tool, as a rule, open-end wrench or a corresponding hex;
• integrated seatpost clamp, a rare and expensive option.

When selecting the main attention is paid to the quality of the material, it determines the safe operation of the bicycle.

Description

Seat post for a bicycle can be made of various materials:

• Aluminum. Because it makes up 90% of the products. The metal is very lightweight, but strong enough to withstand a decent load.
• Steel. Used in inexpensive models. They are very strong and tough, but at the same time have a decent weight.
• Carbon. They prefer to athletes. They are lighter than aluminum to 100-200 grams, but not inferior to them in strength.
• Scandium. For ease it surpasses carbon products. Its drawback - too expensive.
• Titan. High-level pins, usually they are made to order.

Other specifications:

• Length of seatpost:

- 27-30 cm for road models;

- 35-40 cm for mountain bikes.

In order to avoid damage to the probe, at a distance of 10-12 cm before it is applied to the end of the label (usually white line). Above it to pull out and fix the device unsafe. Rule for all kinds of bicycles - the smaller the size of the frame, the longer the required seatpost.

• diameter. Most running - 25 mm (Soviet version), 27, 2 and 31 mm, 6 mm. A number of manufacturers in the manufacture of frames use other dimensions of the openings (in the seat tube). Diameter pin to fit the required size, it may be from 22 to 34 mm, 9 mm.
• Lock for saddle. It helps secure the seat to the bicycle, and the angle of inclination with respect to the frame. There are three types:

- with one bolt (odnoboltovye), adjustment is made quite rude;

- on two bolts (dvuhboltovye) with them tilt angle adjustment can be adjusted precisely;

- original, intricate designs, proprietary vendors.

Another division of locks depending on the position relative to the tube podsedelnika: - offset ago;

- without bias.

models

All pins are divided into two groups:

• Hard. Classical design, used on all bike models, especially in sports. They are highly reliable, lightweight and democratic price. The disadvantages include the restriction of comfort.
• Seat post with shock absorber provides cushioning. Divided into:

- Telescopic. Cheap embodiment, the structure is characterized by high friction in the guiding device, because of this, the direction of impact from below does not coincide with the compression direction of the pin. The mechanism becomes loose and quickly ceases to perform its function. In addition, it has a decent weight. Only in a very expensive brand-name bicycles device is used for a long time and reliably.

- Lever. Structure is provided with a parallelogram mechanism in the elastomer acts as a cushioning member. When pushing device provides an effective cushioning. The disadvantages include planting stretching (due to the amplitude of the rocking of the saddle), heavy weight, high cost, the need for additional protection of joints from dirt.

Pins are available models that allow on the fly to change the height of the saddle. Usually installed on mountain bikes. Integrated pin is integrally formed with the frame. Pipe to fit the biker growth once the lock is attached to it. Change the angle of the seat is possible, but to change the height has not come out.