The TranzX Jump Seat Dropper post is a simplified take on the adjustable height seat post, distilled to the basics. There are no remotes or cables, just a simple lever you engage to quickly adjust the height of your seat. Best of all, it’s only a hundred bucks.
Available in 3 post diameters with a retail price of $99, it’s ideal for slapping on an older trail bike, dirt jump bike or park bike for a quick bit of post adjustability.
- 100mm of seat height adjustment
- Simple, manual lever with no cables to mess with
- Available in 3 post diameters (27.2mm, 30.9mm, and 31.6mm)
- Listed weight: 623g (27.2) 615g (30.9/31.6mm)
There’s almost nothing to the installation of the post… it’s as simple as install saddle, remove old post; slide in Jump Seat post. The ease of use and the ability to quickly swap it between bikes is the best aspect of this post.
I’ve been keeping an eye out for a dropper post that would work on my cyclocross bike. With a 27.2mm post and a minimal amount of post, the TranzX Jump Seat Dropper looked like it might be an inexpensive solution that could result in tons more fun when I pointed it towards single track.
Alas, it was not to be. While the Jump Seat Dropper only has 100mm of adjustability, the stack height of this post is high, which is a bummer for any cyclocross enthusiast looking for an inexpensive option for experimenting with an adjustable height post. Cross bikes are designed for carrying, and as such, don’t feature much in the way of standover height or seat post. Though we’re seeing a number of 27.2mm adjustable posts with 50-70mm of adjustment, the high stack height of this post and lack of adjustability means this post is unlikely to be compatible the cross bike you may already have in the garage.
It seems like a missed opportunity but, it is labeled “jump seat”, which, though disappointing, makes its intentions clear. (sadly, I’m still looking for a 70mm post with a minimal stack of a similar design)
I had some fun testing the post on a few different bike projects in the garage though. The jump seat dropper is a great option for adding fun factor to an older bike you may not use as often, whether it’s an old school xc mountain bike or a dirt jumper. Got a vintage MTB that fits a 27.2 post? It’s perfect for that old MTB you tasked as a commuter.. now you can get a bit more radical on the trip to the store. Sometimes you don’t want to add more cables to a bike, or extra junk on the bars and in this application, this post shines.
While it’s on the heavy side, there’s a lot to be said for the simplicity and ease of installation. Though I was hoping to run it on my CX bike, eventually I found several fun applications for it, on bikes where I didn’t want to bother with modifying frames or adding zip ties to cables.
Dirt jumper – yes. I added a shim to make the Jump Seat Dropper play well on my Santa Cruz Jackal Dirt Jump bike, which made the climbs back up the hill to session the local downhill BMX jump track a lot more pleasant. My Black Market Riot dirt jump bike has a 27.2mm post and it went right on with just a turn of the wrench.
Dropper posts rule. So much that we’d prefer to get one on every bike we own… they just made riding more fun by getting the seat out of the way while embarking on hooliganism and shenanigans.
For more into, visit na.TranzX.com.
Alternatively, you can help support this site by shopping for TranzX Dropper Posts at retail partner JensonUSA.