How to choose a seatpost for your e-bike

Riding an electric bike is different from riding a normal bike, especially in terms of comfort. You spend most of your time sitting while riding, and the motor of the electric bike helps you all the time, helping you save energy, but in the long run this can strain your lower back and thigh area.
So while the e-bike seat post may seem like an unusual part of the ride, it can have a major impact on how enjoyable the ride is. You may ask, "Why is it important to choose the right seat post?" By choosing and fitting the right seatpost you can improve your safety, e-bike performance, comfort and aerodynamics.
In this article, we will share with you some important tips on how to choose a seatpost and select a saddle.

1. What are the types of e-bike seatposts?

An e-bike seat tube is called a saddle pin, saddle post or saddle bar. It is the tube that extends upwards from the frame to the bicycle saddle. It is usually adjustable and it usually has a mark showing the maximum extension and minimum insertion.

In addition to this, e-bike bars can be made from different materials such as aluminium-clad aluminium, carbon fibre, titanium, aluminium or steel.
There are several types of tubes for e-bikes, the most common of which are as follows.
- Dropper type

The first of these is the dropper seatpost, which can be easily adjusted by a switch or lever on the handlebars, even while the rider is still sitting on the bike. The dropper seat is more suitable for riding on rough terrain as you can change the position of the saddle to suit your needs so that you can manoeuvre the bike more easily.
In addition, you can reposition the saddle with a switch or level as a way to improve pedalling efficiency. Most dropper seatpost bikes are equipped with air springs or coils and are electronically, hydraulically or cable actuated.

- Pivot type

Pivoting seatposts are also very common on some e-bikes. They have semi-circular ridges with a concave top that complements the semi-circular ridges with a convex bottom. These two semicircles are joined by a bolt that secures the seat tube to the saddle. This type of seatpost is becoming increasingly popular with riders on mountain bikes.
- Regular type

Often found on family bikes or less expensive e-bikes, this type of seatpost has an extra tightening device at the top, and once the clip is secured, a single bolt holds the remainder of the saddle and seatpost in place.

2.How are the dimensions of an electric bicycle seatposts measured?

Choosing the wrong seat tube size is one of those things that can make people unhappy, especially if you have ordered a seat tube online, and if you order the wrong one then you will have to wait a long time until you have purchased the right one. This is why today I will explain to you how to measure the correct seatpost size.

When determining the correct seatpost size, three factors need to be taken into account - the diameter, length and setback of the tube.
* Diameter
The seat tube is attached to the e-bike frame where you will mount the seatpost. It is important to note that the size of the seat tube varies depending on the e-bike model. Therefore, when selecting a seat tube, please ensure that you determine the appropriate diameter.
In most cases, most e-bike owners will choose a seatpost with a diameter of 27.2 mm. However, seatpost sizes of 35 mm and 21.15 mm are also very common for e-bike vehicles.
* Length
As with the diameter, the length of the seat tube can vary depending on different factors, such as the type of e-bike. Mountain e-bikes are known for their long seat tubes, which means they can be adjusted to different positions and can give the rider a more comfortable sitting position.
Seatpost lengths can range from 75mm to 400mm or even longer, however, before choosing to make a seatpost make sure you have measured the correct length for your needs.
* Setback
Determining the setback of the seat tube should be the final consideration when sizing. Any curve or bend in the upper part of the seat tube is intended to counteract the effect of the frame seat tube, which cup becomes the setback and is usually vertical. Some riders choose to set back because it allows the seat to use the legs and quadriceps more effectively.
If the straight tube makes your seat too far forward, your frame may need a setback tube. The degree of setback varies from frame to frame and can be up to 45mm. It is best to check your frame's specifications or take it to a specialist bike shop to see how much setback your body and frame need.

3. How do I measure the diameter of the seat seatposts?

The frame tube is the part of the carriage that supports the seat tube. Put another way, it is what holds the carriage tube in place. When measuring the seat tube, make sure that you can make it possible to join the two together and do not measure the outer diameter as this will not affect how big the seat tube should be.
Generally speaking, the diameter of the seat tube needs to be measured with a vernier caliper of your choice. You must use a very accurate caliper to measure the inner diameter of the mounting seat tube, and it is worth noting that you need to take care to keep the frame tube clean and free of dust when measuring so that the inner and outer diameters are measured with the greatest accuracy.

4. What is the ideal e-bike seatpost size?

You can check your current or previous seatposts to determine the size of your e-bike seatpost. The most straightforward way to determine how big your seatpost size should be is to do this. Although this may seem easy, the key is that you need to know the diameter of your previous or current saddle tube. If you are unable to determine the length of your current or previous seatpost, you will need to dismantle it and take accurate measurements before you can buy the right one.
The most common e-bike seatpost sizes are usually printed or laser engraved on the end of the insertion line. The diameter of the seatpost is usually a multiple of 0.2 mm, but this is not always the case. If you measure closer to a number that is not a multiple of 0.2 mm, then the next larger size may be more appropriate. For example, if your seat tube is 25.5 mm, the next size up would be 27 mm, and he should be right.
The correct seatpost is one that can be inserted smoothly and without resistance. If the seatpost can be sliced in before the clamping bolt is tightened, then it may be a little too small.

5.Final thoughts

The main problem with seatposts is that they are often positioned too low and when the seatpost is too low it is useless and inhibits you from using all your leg power to pedal.
When you reach the bottom of the pedal stroke you should go and raise your seatpost so that you can get full extension of your legs. In this position, the pedalling position is optimal. Especially when riding mountain e-bikes on trails and approaching any challenging terrain, you need to lower your seatpost carefully.
That's all we've shared with you today. We hope this article has helped you to learn more about e-bike seatposts, and if you have any questions, feel free to visit Green Pedel's official website to discuss!