I would like to install a dropper seatpost (also known as a telescopic or height-adjustable seatpost) on my woom OFF or woom OFF AIR. How do I do this and what do I need to know?
Please note that the compatibility for dropper seatposts exclusively applies to woom OFF and woom OFF AIR models from model years 2023 onward, in size 5 (24″) and size 6 (26″). The size 4 (20″) woom OFF and woom OFF AIR is not equipped for a dropper seatpost with internal cable routing.
When selecting a dropper seatpost model for your size 5 or size 6 woom OFF or woom OFF AIR, you will need to double-check the seatpost's width and total length so that the model can fit into your seat tube. These measurements are important:
Size 5:The dropper seatpost must measure 27.2 mm in diameter with a maximum insertion length of 220 mm. Note that the minimum insertion requirement is 60 mm. Always account for the maximum saddle height as well.
Size 6:The dropper seatpost must measure 27.2 mm in diameter with a maximum insertion length of 270 mm. Note that the minimum insertion requirement is 60 mm. Always account for the maximum saddle height as well.
If you have any doubts about the process or consider yourself inexperienced when it comes to servicing and installing components onto bikes, we would recommend that a professional bike mechanic carries out such work. For safety reasons, installing a dropper seatpost is best done a trained specialist.
To install a dropper seatpost onto a woom OFF or woom OFF AIR in sizes 5 or 6, here's what you need to do:
1. Open the quick-release lever on your woom OFF or woom OFF AIR. Fully remove the saddle and seatpost. Take the saddle off and put it to one side. To do so, you'll need to loosen the bolts from the clamp.
2. Position the dropper seatpost's remote lever in the desired position on the handlebars. Make sure that you place the lever in a position that your child can easily reach and that won't require them to lift their hands off the handlebars to use it.
3. Measure the required length of the cable housing or the Bowden cable so that you can cut it to the correct length. To do so, you'll need to begin from the back (i.e., the seatpost clamp), feeding the cable housing down the seat tube, along the underside of the downtube and up to the place on the handlebars where the lever is now sitting. Now you'll know how long the cable housing needs to be. Cut it accordingly.
4. Thread the cable housing into the purpose-made routing hole in the seat tube, feeding it upwards until a small length comes out above the seatpost clamp.
5. Fill a cable end cap with some grease and put it on the end of the cable housing that's poking out of the top of the seat tube. This will make sure that your cable housing is now watertight.
6. Now thread the inner cable into the open end of the cable housing until it reaches the end.
7. Now thread the prepared cable (inner cable and housing) into the dropper actuator – this varies from model to model, so make sure you consult your instructions.
8. Apply some suitable grease to the outside of the dropper seatpost before installing it into your seat tube. This will prevent damage to the tube and stop water getting in.
9. As you're putting the dropper seatpost into your seat tube, keep pulling on the cable housing so that it doesn't get caught up inside the seat tube.
10. Slide the cable into the hole on your handlebar-mounted lever and attach the cable using the supplied fixing (check the manual provided with your dropper seatpost). Keep tension on the cable as you do so.
11. Cut the cable with wire cutters, leaving an extra one or two centimeters after the clamp. Put an end cap onto the cable to stop it from fraying.
12. Now you're ready to install your original woom saddle onto your new dropper seatpost. Use the bolts provided and follow the instructions in your manual.