Tech Tuesday - Crankbrothers Kronolog Cable Replacement

Mar 31, 2012 at 16:27
by Mike Levy  

Crankbrother Kronolog

Crankbrothers recently released their brand new Kronolog telescoping post, a much anticipated replacement for their original Joplin. The Kronolog features a full 125mm/5'' of adjustment range, all without any set stops in its travel, and depends on an air spring to return it to full height. The post's internals are entirely mechanical, meaning that it doesn't depend upon any oil seals to function properly, and it uses a shift cable to control its movement. Unless you live in the driest of climates, you likely know full well that a season of rain and mud can contaminate a cable, keeping it from moving freely within the housing and requiring you to replace it. Below, we show you how to perform this task on the Kronolog.

Crankbrothers Kronolog seatpost
The Kronolog depends on two spring loaded plates that encircle the post's stanchion. Pushing the remote pulls the actuation cable and unlocks the plates, allowing the post to cycle up or down. Release the remote and the spring forces the plates sit at off angle against the stanchion's clamping surface, firmly holding it in place. All of this is hidden under a protective cap that can be slid off to access its inner workings. An air spring (set between 50 and 80 PSI) returns the Kronolog to full height. The result is the only infinitely adjustable mechanical post on the market.

What's needed:
• 2mm hex key
• Cable cutter
• Replacement shift cable

Some helpful pointers
• The 2mm set screw that holds the cable in place requires no more than 1 Nm of torque to do its job. That's just 0.73 ftl/b. No need to overdo it.
• If you need to replace the housing as well, be sure to not cut it too short. Doing so can lead to routing issues, or cause the Kronolog to inadvertently activate. It is recommended to use brake housing because it's more flexible than lined shift housing, allowing it to be routed smoother.
• There is a small spring under the head of the shift cable that allows for a slight amount of lever movement before activating the post, just 2 - 3mm. Don't lose track of it when you pull the old cable out.


Crankbrothers Kronolog seatpost
Step 1 - Start by sliding the protective cup up and off of the post in order to expose the locking plates and cable anchor.
Crankbrothers Kronolog seatpost
Step 2 - The cable is clamped in place in the upper barrel (the lower barrel serves as the housing stop) via a small set screw. Carefully use a 2mm hex key to loosen and completely remove the set screw, setting it aside in a safe spot.
Crankbrothers Kronolog seatpost
Step 3 - You'll now need to pull the old cable free from the actuation mechanism. You may be able to simply slide it out from the housing, but our cable was crushed by the set screw enough that it didn't want to slide through the barrel. Pushing the two locking plates together gave us enough slack to grab the upper barrel and tug it free, letting us snip off the damaged section of cable and easily pull it out of the housing. Another way would be to cut the cable between the plates and use pliers to pull the remaining from the top barrel.
Crankbrothers Kronolog seatpost
Step 4 - Take note of the small spring sitting under the cable head - it can be easily lost if you quickly pull the old cable out of the remote without knowing about it. Push the cable out slowly and it should come with it.

Slide the spring onto the new cable until it is under the cable's head, and then feed the cable through the remote and the housing.
Crankbrothers Kronolog seatpost
Step 5 - Slide the upper barrel down over the cable, with its lip in the up position so that it nests into the upper locking plate.
Crankbrothers Kronolog seatpost
Step 6 - The Kronolog requires minimal cable tension when compared to a shifter or cable brake, which is why we recommend dialling the remote's barrel adjuster out two or three turns before clamping the cable. This will allow you to remove cable tension by turning the barrel adjuster back in if you pulled the cable too snug during installation.

Pull the cable taut enough to take the slack out of it, but not as tight as you would a derailleur cable, while you snug down the set screw to just 1 Nn with your 2mm hex key. The set screw only requires a very low torque to hold the cable in place, over-tightening it will only damage the screw and make your life hard the next time you need to replace the cable.
Crankbrothers Kronolog seatpost
Step 7 - The remote requires 3 - 4mm of free play before applying tension to the cable, which is taken up by the small spring under the cable's head. No free play means that the cable is too tight, possibly allowing the post to lower or raise on its own. If your cable has too much tension, simply turn the barrel adjuster in (clockwise) until you have the required amount of tension.

Use your cable cutter to snip the new cable as close to flush with the top of the upper barrel as possible to keep it from making contact with the ceiling of the protective cap. Do not install a cable crimp for the same reason.
Crankbrothers Kronolog seatpost
Step 8 - Turn your handlebar in both directions while putting weight on the saddle in order to be sure that the housing isn't too short, there should be no movement in the lower plate. If there is movement, then you do not have enough play in the lever. Slide the cover back down over the actuation mechanism - you should hear it click into place when it's home - and cycle the post up and down a number of times to check your work.




Past Tech Tuesdays:
TT #1 - How to change a tube.
TT #2 - How to set up your SRAM rear derailleur
TT #3 - How to remove and install pedals
T #4 - How To Bleed Your Avid Elixir Brakes
TT #5 - How To Check And Adjust Your Headset
TT #6 - How To Fix A Broken Chain
TT #7 - Tubeless Conversion
TT #8 - Chain Wear
TT #9 - SRAM Shift Cable Replacement
TT #10 - Removing And Installing a Headset
TT #11 - Chain Lube Explained
TT #12 - RockShox Totem and Lyric Mission Control Damper Mod
TT #13 - Shimano XT Crank and Bottom Bracket Installation
TT #14 - Straightening Your Derailleur Hanger
TT #15 - Setting Up Your Front Derailleur
TT #16 - Setting Up Your Cockpit
TT #17 - Suspension Basics
TT #18 - Adjusting The Fox DHX 5.0
TT #19 - Adjusting The RockShox BoXXer World Cup
TT #20 - Servicing Your Fox Float Shock
TT #21 - Wheel Truing Basics
TT #22 - Shimano Brake Pad Replacement
TT #23 - Shimano brake bleed
TT #24 - Fox Lower Leg Removal And Service
TT #25 - RockShox Motion Control Service
TT #26 - Avid BB7 Cable Disk Brake Setup
TT #27 - Manitou Dorado Fork Rebuild
TT #28 - Manitou Circus Fork Rebuild
TT #29 - MRP G2 SL Chain Guide Install
TT #30 - Cane Creek Angleset Installation
TT #31 - RockShox Maxle Lite DH
TT #32 - Find Your Tire Pressure Sweet Spot
TT #33 - Three Minute Bike Preflight Check
TT #34 - MRP XCG Install
TT #35 - Stem Choice and Cockpit Setup
TT #36 - Handlebars - How Wide Affects Your Ride
TT #37 - Repairing A Torn Tire
TT #38 - Coil spring swap
TT #39 - Trailside help: Broken Shift Cable
TT #40 - Installing a Fox Float Air-Volume Spacer
TT #41 - Replace the Seals on Your 2011 RockShox Boxxer World Cup Fork
TT #42 - Clean and Lubricate Your Fox F32 Dust Wiper Seals
TT #43 - Thread Locker Basics
TT #44 - Install a SRAM X.0 Two-By-Ten Crankset
TT #45 - VPP Suspension Bearing Service
TT #46 - Rotor Straightening
TeT #47 - Finding and fixing that creak
TT #48 - Bleed and Service Magura Marta Disc Brakes
TT #49 - Cup and Cone Hub Basics
TT #50 - Install and Adjust Pedal Cleats
TT #51 - Cup and Cone Hub Rebuild
TT #52 - Converting Mavic Crossmax SX Axles
TT #53 - Cassette Removal and Installation
TT #54 - Cane Creek AngleSet Installation
TT #55 - American Classic Tubeless Conversion
TT #56 - Wider Rims Are Better and Why Tubeless Tires Burp Air
TT #57 - Pedal Pin Retrofit
TT #58 - Bleed RockShox Reverb Remote Lines
TT #59 - Cutting Carbon
TT #60 - Silence That Squeaky Disc Brake
TT #61 - Five Minute Wheel True
TT #62 - Removing Bike Rack Rattle
TT #63 - Inside Shimano's Shadow Plus Mech and How To Adjust It
TT #64 - Steerer tube length
TT #65 - Marzocchi 44 Rebuild
TT #66 - RockShox BoXXer TLC
TT #67 - Ghetto Tubeless Tire Inflator
TT # 68 - RockShox BoXXer Seal Replacement
TT #69 - Ghetto Dropper Post
TT #70 - FSA Orbit Option Install
TT #71 - How to Bleed Formula Disc Brakes


Visit Parktool.com to see their entire lineup of tools and lubes


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52 Comments

  • + 48
 great now all 3 people who own this in the world know how replace the cable
  • + 4
 That was my first thought, who even has one of these?
  • + 11
 Yeah.. This should be in a review, not a Tech Tuesday. From what I've seen, Tech Tuesdays should be for fixing common problems on widely used products, not testing new, specialized products that not many of us actually own. Leave that for the full length review
  • + 2
 LOL! spot on. after their wonderful joplin seat posts had 'awesome' reviews and they even ended up replacing it with an entirely new one, i'll just wait for reviews of this new one and hopefully, its not as 'awesome' as the joplin.
  • + 1
 The first thing that we do with most new products is to take them apart, giving us a much better understanding of how the product functions - we used this opportunity to show riders how to swap a cable. You're right, though. There are not many Kronolog posts out there right now but there will be soon, and all TTs are indexed and searchable, meaning that when the time does come for Kronolog owners to change its cable they will be able to quickly look it up.
  • + 1
 as I just did, years later. Thanks Mike!
  • + 17
 Not doubting the product or anything, but with you writing up this TT mean that the cable on your new Kronolog is going to die after 2 rides? I know a cable is to be replaced after time but surely you wouldnt have thought a TT to come up about a new product so quickly, as surely Crankbrothers have made yet again another great product?

I just still am not seeing any amazing steps forward since the Reverb?
  • + 3
 We got our Kronolog a few weeks ago and it's currently working great on Mike's bike as he tours around sunny destinations in the USA. We wanted to see how tough it would be to change a cable should the occasion arise - hence making a TT - two birds one stone kinda thing. Taking one apart (like most things we get our hands on) showed us a post that is not like all the rest and that is refreshing as there are a few posts out there that need some updates.
  • + 27
 you got two birds stoned at once?
  • + 1
 This is silly. Lets take a product no one has their hands on yet, and service it. Big fan of your work.
  • + 1
 Has Mountain Bike Advertising (I mean Action) taken over PB?
  • + 4
 Too clever jimeg - but really we try to come up with ideas each week and we know that some are not gonna be relavent to all riders. Yep a new product that we want to figure out, so we shared our experience with all readers. You have a bad ass Ibis with a lot of nice parts, some of which we've featured in the past, not everyone has those. See where I am going here? Maybe give us some slack man.
  • + 1
 My comment was in the line of wondering "why is this post being featured in the TT already?". Intentional or not, the tech article comes across as more of a disguised slight of hand pre-hype advert for CB than it does a TT considering the newness (and near unavailability) of the product and the trouble they had with their last adjustable seat post(s). That sort of move is typical of MBA. Please pardon me if I misinterpreted the intention(s) of the article or if I came across as more of a forum warrior than a critical thinker.
  • + 1
 You're right, there are not many Kronolog posts out there right now but there will be soon, and all TTs are indexed and searchable, meaning that when the time does come for Kronolog owners to change its cable they will be able to quickly look it up. This is not a reflection of the post's reliability, but rather that you WILL have to change a cable at some point in order to keep it working well, just as you would for your rear shifting. Having to swap a shift cable does not mean that your rear derailleur is junk, just that you need to give it some love to keep it working well.
  • + 4
 Have you guys thought about setting up a poll to see which products are most owned by Pinkbike's active community? I'm almost positive the Kronolog would never show up. But then again, I'm pretty sure you know that already know that. Perhaps you're on another agenda I haven't quite figured out.
  • + 4
 nice looking post, time will tell how it works out, but am i the only person in the world that prefers a dropper seat post with stepped drops rather that an infinitly adjustable post?

went from using an infinitly adjustable post to using the stepped speedball post that came on my spesh evo and much prefer it as i know exactly how far it will go up or down whenever i press the button rather than an infinite post which most of the time ended either too low or too high
  • + 1
 I think I may agree to this. At first I thought an infinite would be prime, but now I'm thinking at preset position might be optimal (for me anyway.) I have a reverb and I'm constantly trying to get it at a good position. I seem to always stamp it down to low! Maybe have a post sink in one inch increments and come up full.
  • + 4
 i think most riders set it so that full extension is there normal uphill riding height. either way im going to purchase one of these and i know it will be more enjoyable than stopping to drop my seat post every ride.
  • + 9
 With 'stepped' drops you sometimes have to hunt for that 1" drop. Nothing makes for a sight like dry humping your bike on the trails.
  • + 2
 Yeah, I've got a KS Dropzone, and the infinite adjustment seems like a great idea, but I'd be happy with the ability to chose where I have a "set" 1st down position. It's not always easy to drop it just enough. I'm getting better at it with practice but would love to be able to have it drop a pre-set amount with a single push of the lever. But the key thing would be to decide on where that pre-set position would be.
  • + 4
 I like the thinking behind these posts, cable to the post body rather than the head clamp causing cable slack/bunching during operation , and no problms with oil seals leaking into places they shouldn't. After seeing how easy it is to carry out cable maintenance i,ll being looking into buying one of these and comparing the price to the Reverb and KS950i posts ( which have the less ideal cable routing ) THANKS PINKBIKE !
  • + 1
 good comment
  • + 3
 I own one...... right from CB, first one in BC....I had to lengthen the cable since I am running it behind the post so thanks PB.... Although it is pretty simple.
  • + 1
 stuy could you tell me how long you've had yours and how well its treated you, there not actually on sale in my country yet but going on American prices i think they will be around £200 GBP , your feedback on strength, wear and reliability would be great if you have time.
  • + 3
 Did I miss the launch of this or would I be right in thinking this tech tuesday is based on a pre-production sample of a product that's not available to buy yet?
  • + 2
 I think it was released almost three weeks ago.
  • + 1
 At Probike they have the release date as May 15th!
  • + 1
 It was announced a couple of weeks ago, should be hitting the shops around June in the UK.
  • + 1
 Isn't the Kind Shock Dropzone (i900r) also mechanical with an air spring with infinite adjustment? I don't think the air spring is adjustable, but it is also operated with a standard shift cable, so don't see the difference.

"The result is the only infinitely adjustable mechanical post on the market."?????
  • + 3
 The KS is a cable operated hydraulic post. This means that the cable moves a lever arm on the post that opens a normally sprung closed port. Opening this port lets oil flow through and the post to change it's height. The Krono uses a mechanical mechanism instead of fluid.
  • + 1
 Crankbrothers. Ha! People don't like the brand, do they? I've got a Joplin 4 and it had it's problems in the winter, but so far it's running well. If it dies...frig it, there is always a normal post that'll work.
  • + 1
 Just called the Canadian distributor, Norco. They said that they don't expect the post to be available until 'the end of the summer'.
  • + 1
 Height adjust post are pretty much one of the most needed parts where you live - such good riding there man!
  • + 1
 Come back any time Ty
  • + 1
 I have two on order. Can't wait to get them. Been waiting for several years for the right one. And now I know how to easily service it too. Thanks kids!
  • + 1
 That's a cable change not a service.
  • + 1
 this is for all you mechanical engineers who really dont know what your doing
  • + 1
 I'm interested in one of these posts and was curious to see how it worked. So thanks for sharing.
  • + 2
 my reverb just died after 2 months this could be on my shopping list
  • + 1
 Stiffy? Right up your .... Boy, wouldn`t want to be seen with an erectorset on my bike.
  • + 1
 If this is RC's saddle then I totaly rest my case with his Sidi shoes Smile it's as classic as it gets
  • + 1
 Haha nope it's Mike's seat Waki.
  • + 1
 Heh, I bet they would love to see a Campagnolo MTB grouppo Big Grin
  • + 1
 Maybe just put one of those little shifting rubber booties on there between the plates to keep crud out.
  • + 2
 Amazing seat by the way ! Anybody know the name of this product ?
  • + 1
 The seat is a "thrones" seat. They are made here in Australia.

www.bikethrones.com
  • + 2
 While the saddles are designed in Australia they are made in Taiwan. Still really nice looking stuff
  • + 1
 Lots of miles on the Thrones saddle - good fit for me.
  • - 1
 the dang thing hasnt even been out that long ! and now your teaching us how to recable it ? i think this is saying a little something about crankbros ..
  • + 2
 I'm not sure how changing a cable is a reflection of the post's reliability...? It's cable operated, meaning that you'll have to swap its cable every now and then to keep it running at its best. When your rear derailleur cable gets contaminated does it mean that your derailleur is junk?
  • + 1
 Where do you buy these seatposts?
  • + 1
 Reliability will be zero ?

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