is a house brand for JD Component Company, who have factories in Taiwan and China that produce a modest range of dropper seatposts. The TranzX model YSP12 reviewed here (which can also be found under the "BrandX" name at Chain Reaction Cycles), came into my hands while testing a series of affordable trail bikes this fall. The bike I was reviewing wasn't equipped with a dropper, so off to my local bike shop I went, where I discovered that I could purchase a 125-millimeter-stroke, internally-routed TranzX post for less than $150.
The TranzX dropper appears to be well made, with a highly-polished, hard-anodized black finish and a RockShox Reverb inspired saddle clamp. Side play was almost nonexistent, and the internals are powered by a replaceable cartridge, which can be pressurized via a Schrader valve hidden beneath the saddle clamp to fine tune its return speed. The TranzX post is machined from 7075 aluminum alloy and weighs 545 grams. Its cable-actuated mechanism is both simple to install and adjust, and two types of remote levers are available: a vertical lever that requires minimal space on the handlebar, and the more conventional paddle lever that you'll see in this review.
Riding the TranzX Dropper
• Construction: High-strength 7075 aluminum, replaceable cartridge
• Cable-actuated with internal routing
• Stroke: 125 (reviewed), 120, 100, 80mm available
• Sizes: 30.9 and 31.6mm
• Air-adjustable return stroke
• No-set-back, 2-bolt saddle clamp
• Weight: 545 grams
• MSRP: $150 USD
Before you can ride your new dropper, you'll have to install it. Fortunately, this is an easy proposition. Cable-actuation means that you can either work the cable or the housing through the inside of the frame, which ever is easier. The fixed end of the cable slides into the remote paddle, while the free end is fixed to the post's actuation mechanism by a set-screw-barrel. Set the barrel so there is no free play in the post's actuator lever, tighten the set screw, clip the excess cable, and the hard part is over. I discovered that the TranzX paddle remote lever was a better fit inboard of the brake lever perch and that's where I left it.
On trail, the TranzX post operates smoothly, with a slightly damped return and a similar feel when compressing it to the retracted position. That slow retraction took some getting used to. The Fox Transfer post I had been using previously snapped to its fully bottomed position so easily that the small amount of resistance the TranzX gave me seemed excessive for a couple of rides. Originally, I was going to add some air pressure to the return spring to speed up the post, but that would have increased the retraction effort as well, so I found a pressure that felt balanced in both directions and called it good. Now that I'm used to the sensation, however, I rarely give it a thought.
As mentioned, there was almost no side-play in the post when I installed it, and that's how it remains after giving it a good thrashing. I am impressed so far, and if the TranzX can survive through the winter season, I'll call it a win. Less impressive, however, is the remote lever. which feels cheaply made, both in its tactile feel and in the way it flexes during operation - but in its defense, it has been functionally reliable and has not required any adjustment or attention since initial setup. Pinkbike's Take: