No big loop of cable or hydraulic hose flopping around. No rotational saddle wobble. Can stop at any seat height within the travel range. Easy to adjust cable length. The ability to clamp the seatpost in a bike stand without yanking the cable or creating a leak in the hydraulic hose. Even a place to clamp a taillight for an epic ride.
All of these features are music to the ears of anyone who has ridden many dropper seatposts. The Crankbrothers Kronolog provides all of them. If you’re hooked on dropping your saddle whenever you want to clear a steep, rocky descent and on having it come faithfully springing back up to where you had it for the next hard pedaling section, but you don’t want all of the other compromises that most dropper posts require you to accept, you need look no further.
You can find a lighter or a cheaper adjustable post, but you’ll forget about the grams or dollars you saved when the saddle becomes so loose and floppy rotationally that you no longer have a secure perch for your butt. And the elegance of an exquisitely-shaped hydraulic pushbutton on your handlebar will be lost on you when simply bumping the bike when the seatpost is clamped in a repair stand or otherwise snagging the big loop of hydraulic hose bursts the hose and requires careful hydraulic hose cutting, reconnecting, and bleeding.
You also will forget how beautifully your post worked initially when you’ve had to go to the hassle of removing and replacing your saddle (especially for the second or third time) merely to take up cable slack because the handlebar lever will no longer release the dropper mechanism. And when the miniscule cable-clamp bolt on the seatpost head finally and predictably strips the threads in the aluminum activating lever it screws into, you will ask yourself why you spent the money you did on it, because you’re ready for another one.
All of those issues are resolved in the Kronolog. The keyed shaft keeps the saddle rock-solid rotationally, and the cable stays in place along the top tube and doesn’t snag on cranks, bushes, or bike stands.
Furthermore, the air spring returns it to height quickly, yet a damping system prevents it from shooting up so fast that it’s dangerous. It locks up in both directions instantly, wherever you choose to stop it with your butt. There’s no trying to find the middle position of three possible—just hit the remote lever, drop your butt to where you want it, and release the lever.
After using it for three months, the saddle still is not floppy, I’ve never snagged the cable on anything, and it still works like it did on Day One. And I will never have to remove my saddle to adjust the cable length or even futz around up there to get at the cable clamp; it is easily accessible right above my seat binder clamp simply by sliding up a cover.
The Kronolog post has 125mm of travel, and you need to have at least 225mm of seatpost extension (from the top of the clamp to the seat rail) at full seat height to use it. You can deflate the air spring, unscrew the cap on the bottom of the seatpost, and clip a supplied 20mm cylindrical spacer under the piston to shorten the travel and required minimum seat height above the seatpost clamp by 20mm. Need it shorter yet? Add another one.
The Kronolog’s remote handlebar lever is nothing fancy, but it is robust and easy to push. It can also be disassembled to use it on the right side above the handlebar, rather than on the left. A spring inside the lever under the cable head keeps the lever from rattling while at the same time allowing the proper amount of cable free play for optimal operation.
The advertised Kronolog weight with remote lever is 493 grams, but the one I’ve been using actually weighs 549 grams (56 grams more). At $300, it is priced about the same as the Specialized Command Post Blacklite, more than the Gravity Dropper, the Crankbrothers Joplin it’s replacing, and Kind Shock and other Asian brands, and less than the RockShox Reverb and the Fox D.O.S.S.
Kronolog is the only infinitely-adjustable mechanical seatpost, and the minimal number of internal parts (thanks in part to incorporating an air spring) decreases potential for failure. Indeed, Crankbrothers claims that it lasts in fatigue tests almost three times as long as the EN (European Norm) standard requires, a test that many dropper posts fail.
Eliminating the big loop of cable or hydraulic hose that moves up and down with the seatpost also eliminates lots of potential for failure. The Kronolog cable doesn’t move as the post moves because it connects at the top of the stationary part of the post, not at the head.
The company thought through the problems it had with the Joplin and addressed them. Simplicity, functionality, durability, and industry-leading performance: Crankbrothers may have a point in calling it “the Eggbeater of the adjustable seatpost market.”