RSP Plummet Remote Dropper Seatpost

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Product Description

Enjoying the benefits of a dropper seat post isn’t just for the elites. The RSP Plummet Remote Dropper Seat Post brings the joys of dropper posts to a more accessible price point.

The RSP features 125mm of drop with infinite adjustability. It is an air-free design with a hydraulic damping. It is cable operated with a handlebar mounted remote. The remote can be attached to either side of the handlebar to cater for every setup preference.

The RSP Plummet is available in both 30.9mm and 31.6mm diameter and has a dual bolt inline saddle clamp, making it easy to get the saddle in the perfect position. The Plummet has external routing, so doesn’t need a frame with internal routing to be used.

Key Features:

  • 30.9mm/31.6mm x 441mm Dropper seat post
  • 125mm drop with infinite adjustability
  • Air free design
  • Hydraulically damped
  • Cable operated handlebar remote
  • Dual bolt inline saddle clamp
  • Simple cable replacement procedure
  • Lowering the saddle makes any bike easier to handle through technical sections
  • 720g including cable & remote

    Occasionally, without notice, manufacturers change product design and/or specifications.

    Dropper Seatpost Guide


    Dropper Seatpost Guide

    Saddle height is hugely important for off-road riding. This makes a dropper seatpost a must have for almost every type of mountain biking as well as gravel cycling. There is a huge array of different styles and fitment options to choose from and you need to be sure that you’re making the right choice.

    Whether you are fitting one for the first time or upgrading your exiting dropper this guide will help you to choose the right one for you and your bike.

    What size dropper post do I need?

    When choosing a new dropper post you will need one that fits in your frame and works with your body on the bike. These are the things that you need consider before you purchase:

    Seat post diameter

    As with any seatpost you will need to know the internal diameter of your frame’s seatube, so you can get one that’s the right size. This will often be written on your existing seatpost or you can get it from the manufacturers frame specifications.

    Most seatposts are one of three sizes, 27.2mm, 30.9mm or 31.6mm. If your bike has one of the larger two sizes then you’ll have a wide choice of options, but options are limited for 27.2mm posts as the narrow size makes it harder to fit the internal mechanisms.


    Maximum Travel

    While you will want to go for as much travel as you can, so you can move the saddle right out of the way when you need to, you will be limited by a number of factors. First, you’ll need to know the longest travel that your frame and maximum saddle height will allow.

    Measure the distance from the top of the seat tube to the bottom of the saddle rail. This is the amount of space you have between your frame and your saddle. Dropper posts don’t allow the saddle to drop all the way to the frame as some of this space is taken up by the dropper post mechanism. There is usually around 80mm of space between the frame and the saddle when the post is fully compressed but this number will vary between brands.


    Your maximum travel will be the amount of space between your frame and saddle minus the amount of space taken up by the dropper when it’s fully compressed. For example, if the space between your saddle and frame is 250mm then taking away 80mm for the dropper mechanism leaves you with 170mm of maximum travel. Any amount of travel below this number will work for you as long as you have enough room in you frame.

    Frame to saddle distance – dropper post mechanism = Max travel


    Maximum Insertion Depth

    Because longer travel seatposts have a greater overall length and are positioned lower in your frame you need to consider the maximum insertion depth of your frame. This is especially important if you have an offset or kinked seat tube that limits how far into the frame a seatpost can go.

    To find out the maximum insertion depth use a conventional seatpost and push it into the frame as far as it will go. If it bottoms out mark the position and measure the distance to the bottom of the post to get your maximum insertion depth. If the seatpost doesn’t bottom out, then your maximum insertion depth will be longer than the seatpost length.


    How far a particular seatpost will need to go into your frame is the overall length of the post minus the frame to saddle distance. The maximum insertion depth needs to be greater than this amount for it to fit. It is also worth noting that some seatposts have cable actuators that sit below the stated overall post length. Err on the side of caution and make sure there is enough clearance for the post to work properly.

    Length of extended dropper - Frame to saddle distance = seatpost insertion depth



    While some dropper posts have an actuation switch on the post itself most use a remote switch that attaches to the handlebars. A remote switch enables you to move the post without having to take your hands off the bars. This is a big advantage as is allows you to adjust your saddle height when riding technical terrain.

    There are different types of remote switch and the ideal one will depend on your cockpit set up. Most people like to run the remote under the bars on the left side. In this position you don’t need to move your hand far to operate the post. If this space is taken up by a shifter or suspension remote, then you may need a collar style remote or one that fits on top of the bars.


    Cable Routing

    Dropper seatposts either have internal or external cable routing. Internal cable routing is much cleaner, but you can only use these posts if your frame is compatible. Most modern MTB frames are compatible with internally routed cables. Sometimes there is a hole at the bottom of the seatube to allow the cable to exit but other frames route all the way up to the headtube.

    If your frame isn’t compatible with an internally routed dropper then you’ll need a post with external routing. These are easier to fit, but the extra cables do spoil the lines of the bike.

    The other alternative is to go for a wireless dropper post like the RockShox Reverb AXS. With no cables these posts are the easiest to fit and can be swapped between bikes relatively easily.


    Delivery & Guarantee

    UK Delivery Information

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    Returns & Warranty

    It's easy to return a product with our 365 day, hassle free returns. 

    We will give you a full refund on any item that is returned to us unused/unfitted, in a resaleable condition and in its original packaging (where possible).

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    If your item develops a fault or arrives damaged, please contact us first so we can resolve the issue for you as quickly as possible.

    For more information please visit our Returns & Warranty page.