Are all dropper post cables the same?

Most all dropper posts come in a variety of different options, most usually broken down between the seatpost diameter and the post’s travel. The seatpost diameter is the diameter of the post that gets inserted in to the frame, usually either 27.2mm, 30.9mm, 31.6mm, or 34.9mm.

What cable do you need for a dropper post?

​Spiral-bound stainless cables undergo a polishing process to remove imperfections, and the 0.8mm diameter improves flexibility and further reduces friction. With no coating to wear off, these cables provide long-lasting performance. STR-PS cables are designed for use only with dropper seatposts and remote levers.

Is dropper post cable same as shifter cable?

Instead of the traditional 1.2mm cables used for shifters, the dropper cable measures just 0.8mm. Jagwire says this results in a more flexible cable which is superior for the tight bends often associated with internal cable routing as the dropper cables transition from the downtube to the seat tube.

Can I use a gear cable for a dropper?

Yes you can.

Are dropper posts universal?

For the most part, No. A few companies like KS and Thomson do offer droppers in each of these sizes. But even they tend to offer shorter travel posts only in the smaller diameter due to stiffness and durability concerns, while the large diameter versions offer wider travel options.

What size is dropper post cable?

The most common size is 31.6mm and is used on the majority of Boardman, Voodoo and Carrera mountain bikes.

Why does my dropper post go down when I sit on it?

If your dropper post is moving without pressing the lever (it won’t stay up as you are riding), then you have too much tension on the cable. You’ll want to REMOVE tension.

How do I know if my bike is dropper post compatible?

You can visually check from the outside with a tape measure to see if you have plenty of length to insert the dropper into your bike. But the best way is to mark this dropper insertion length onto your current rigid post from its end, then see if you can insert it far enough into your frame.

How do I know if a dropper post will fit my bike?

To choose the correct travel dropper post, measure from the seatpost collar to the seat rail (in your climbing, or highest setting) on your current bike. Subtract 50mm from this measurement and the resulting number is the maximum travel length dropper post you can comfortably run.

How do I know what size dropper post I need?

What size are droppers?

The most common sizes of diameters are 27.2, 30.9, 31.6mm with a newcomer of 34.9mm starting to become more common.

Does internal cable routing matter?

Besides the clean look, a cable running inside the frame is protected by the frame. Outside it can be more likely to rust, fray and fail. But, internal cables have to be done right. If not, the outer cable routing will still be superior and easier to maintain, too.

Is internal cable routing good?

A fully internally routed cable without housing is the better way to go when it comes to aesthetics. Nevertheless, there is no evidence that internal cable routing demonstrably improves shifting or braking performance compared to externally routed cables.