27.2mm Dropper Post
External Routing
0 | 50 | 100mm


Availability: In stock

SKU: SPD27.2E Categories: ,
This 27.2mm dropper post with external routing represents excellent value for money. It includes the external cabling and the dropper switch, everything you need to upgrade your seatpost with a dropper seatpost.
External cable routing with Switch

27.2mm Dropper Post Installation

1. Make sure your bike seat tube fits this seat post dropper.
2. Ensure sure your bike seat tube has no sand, dirt, metal shavings or other debris inside which may scratch the dropper post.
3. Install the seat post with the cable port facing the rear.
4. Install the remote control switch onto your bicycles handlebar.
5. Install and fasten the cable with zip ties onto your bikes frame.
6. Turn the handlebar fully left and right to make sure the cable routing does not interfere with your steering control.

Operation Instructions

There are three different height levels of adjustment for the 27.2mm seat post dropper. These include 0, 50 and 100mm
3 adjustment levels 0 50 and 100mm

How to Lower the Saddle

  1. Raise your hips slightly without leaving the saddle completely.
  2. Press and hold trigger slightly without leaving the saddle completely.
  3. Use your body weight to push down the saddle
  4. Release the remote lever once the saddle starts to move down.
  5. The saddle shifts into the next notch automatically with a “Click” sound.

Shifting the Saddle Higher

  1. Raise your hips slightly without leaving the saddle completely.
  2. Press and hold the remote lever allowing the saddle to move up.
  3. Keep raising your hips until the saddle goes into the next notch after hearing the “Click” sound.

27.2mm Dropper Post Specifications

Brand: GUB.
Model number:  SPD27.2E.
Material: Aluminum alloy.
Cable length: 150cm.
Switch Connection: Wired.
Total length: 440 mm.
Colour: Black.
Lifting range: 0, 50 and 100mm.
Seatpost tube fitment: 27.2mm
Net weight: 632 grams +/- 5%.
We also have 30.9mm dropper posts available plus a range of bike tools to get the job done. If you have a wider seatpost tube than 27.2mm we have a great range of shim adaptors to make these droppers fit most bikes.

Why Use an Externally Routed Dropper Post

A dropper post is a type of bicycle seatpost that can be quickly and easily raised or lowered, allowing the rider to lower their seat for technical riding and raise it for climbing. Externally routed dropper posts are the most common type of dropper post, and they are easy to install and maintain.


  • Compatibility: Externally routed dropper posts are compatible with any frame that has a standard seatpost opening. This makes them a good option for riders who are upgrading their bikes or who are buying a new bike without a dropper post.
  • Ease of installation: Externally routed dropper posts are relatively easy to install. The cable can be routed through the frame using a variety of methods, and there are no internal cable housings to worry about.
  • Ease of maintenance: Externally routed dropper posts are also easy to maintain. If the cable gets dirty or frayed, it can be easily replaced.


  • Cable rub: The cable that controls the dropper post can rub against the frame or the rear tire, which can cause noise and friction.
  • Looks: Some riders don’t like the way that externally routed dropper posts look.

Benefits of Using a Seatpost Dropper Post

Overall, externally routed dropper posts are a good option for most riders. They are compatible with a wide range of bikes, they are easy to install and maintain, and they offer a number of performance benefits.

Here are some of the benefits of using a dropper post with external routing:

  • Improved control: A dropper post allows you to lower your seat for technical riding, which can improve your control and stability.
  • Increased confidence: A dropper post can give you more confidence on technical trails, because you know that you can lower your seat if you need to.
  • Less fatigue: A dropper post can help you to avoid fatigue on long rides, by allowing you to lower your seat and rest your legs.

If you are looking for a way to improve your mountain biking performance, a dropper post with external routing is a great option.

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