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Crankbrothers Highline XC/Gravel Dropper Post 80mm



Top quality dropper post that is simple to set up, and its smooth operation makes it a joy to use
Excellent quality
Smooth action
Short travel allows for saddle bags
Handlebar remote isn't included
No external option

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

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The Crankbrothers Highline XC/Gravel Dropper Seatpost is the latest addition to its line-up. It comes in a number of drop lengths to suit a whole range of adventure bike sizes, and the quality is excellent, as is the motion. You'll need to factor in an extra £43 for the drop bar remote, though.

The dropper post. Another of those components that comes into the category of, do you really need one on a gravel bike? On the whole I'd say probably not, though others might disagree; I'd say it really comes down to what kind of terrain you ride on a regular basis. Gravel and adventure riding has so many more variables than your standard road ride.

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If you do decide you need one, the Highline would make a very good choice as the operation is so smooth; it feels a really top-notch piece of kit. That's also backed up with a four-year warranty.

Many gravel bikes are set up to use 1x groupsets, so there is often a spare internal cable routing point, and this is how the Crankbrothers post is designed to work.

Running the included Jagwire inner and outer cable through the frame, it connects to the base of the post from inside the seat tube for a smooth and clean look. It also keeps everything out of the way of mud and dust.

2021 Crankbrothers Highline dropper seat post 2.jpg

It's very easy to set up, provided your frame is relatively straightforward to thread cables through internally.

For testing I was also using Crankbrothers' new Drop Bar Remote Kit (review to come), which allows you access from wherever you are riding on the handlebar.

2021 Crankbrothers Highline dropper seat post 4.jpg

The XC/Gravel post uses the externals of Crankbrothers' Highline 3 model and the internals of its range-topping Highline 7, which means a hydraulic IFP (internal floating piston) cartridge with the gas and oil being separate.

The operation of the dropper post is very smooth in both directions, and quick too. It's a real pleasure to use.

> How to make your bike more comfortable – check out our 14 tips

One of my main testing loops for gravel bikes takes in many different terrains and there are a couple of steep singletrack downhill sections that have eroded over time, leaving plenty of exposed tree roots.

My gravel bike is set up like my road bike, with a low front end and plenty of exposed seatpost, which puts plenty of weight over the front when descending technical sections on the brakes. Add in a loaded bar bag and handling can become a little tricky.

Being able to drop the post, even by just the 80mm achievable on our test sample, is enough to allow you to comfortably place your bodyweight over the rear of the saddle. For me, with the post fully dropped, that still allowed enough clearance when using a decent sized saddle pack.

There are other options available too, starting from 60mm of drop up to 125mm, with 80mm and 100mm in between.

A few dimensions for you...

The total post length is 407mm, with the minimum insertion length being 100mm and the maximum being 264mm. The stack height (the distance between the collar and the rail when dropped) is 60mm and there is zero setback.

2021 Crankbrothers Highline dropper seat post 3.jpg

The diameter is 27.2mm only, which will fit the majority of gravel bikes. If yours is larger at 31.6mm, like mine, then you'll need a shim – they're cheap and easy to locate.


When it comes to the price, the Highline will set you back £225. Not cheap, but not extortionate either.

Brand-X's seatposts tend to review well, partly down to the price. Its Ascend CX Dropper has a similar amount of drop as this Crankbrothers but will set you back around £139.99, and that includes the handlebar remote control too. It's about 80g heavier.

The Highline really shines through on quality and operation, though, which goes a long way to justifying the price.

At £263 when you include the lever, the Crankbrothers Highline does still look quite good value when you compare it to something like the Ritchey WCS Kite Dropper post at £345. Yes, the WCS does have a few tricks up its sleeve, but I'm not sure that justifies the extra cash.


Overall, the Highline has really proved itself on my gravel riding. Something I thought would just be a passing fad during the test period has become a real part of my off-road adventures. The small amount of drop works really well on this type of bike while allowing you to still ride loaded up, and the overall quality of the build means it's pretty much a fit and forget component.


Top quality dropper post that is simple to set up, and its smooth operation makes it a joy to use test report

Make and model: Crankbrothers Highline XC/Gravel Dropper Post 80mm

Size tested: 80mm

Tell us what the product is for and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?

Crankbrothers says, "The all-new Highline XC/Gravel delivers infinite adjustment, smooth feel, and easy installation."

It's a quality dropper post that works smoothly and should stand the test of time.

Tell us some more about the technical aspects of the product?

Crankbrothers lists:

27.2mm seatpost diameter to fit most XC and gravel bikes

Jagwire® cable and housing

Self-contained IFP hydraulic cartridge

Internal routing

Quick connect mechanism for ease of cable installation

Linear actuator for quick return speed

2-bolt standard head


material 7075-T6 Aluminum

max extended length 280mm

max insertion length 264mm

min. insertion length 100mm

min. stack height 60mm

seat post diameter 27.2mm

setback 0

total post length 407mm

travel adjustment 80mm

warranty 4 years

Rate the product for quality of construction:
Rate the product for performance:
Rate the product for durability:
Rate the product for weight (if applicable)
Rate the product for value:

Tell us how the product performed overall when used for its designed purpose

Reacts very smoothly and quickly.

Tell us what you particularly liked about the product

Absolute quality in looks and function.

Tell us what you particularly disliked about the product

No external cable guide option.

How does the price compare to that of similar products in the market, including ones recently tested on

There are some on the market that can undercut it, but the Highline post is a quality piece of kit that can justify its price tag. It comes in a lot cheaper than the likes of the Ritchey model mentioned in the review too.

Did you enjoy using the product? Yes

Would you consider buying the product? Yes

Would you recommend the product to a friend? Yes

Use this box to explain your overall score

You can't fault the quality or the operation, it really is a lovely bit of kit, although you do need to take into account the price of the lever too. Internal routing means it won't work on 2x groupset-equipped bikes.

Overall rating: 8/10

About the tester

Age: 42  Height: 180cm  Weight: 76kg

I usually ride: This month's test bike  My best bike is: B'Twin Ultra CF draped in the latest bling test components

I've been riding for: Over 20 years  I ride: Every day  I would class myself as: Expert

I regularly do the following types of riding: time trialling, commuting, club rides, sportives, fixed/singlespeed,

As part of the tech team here at F-At Digital, senior product reviewer Stu spends the majority of his time writing in-depth reviews for, and ebiketips using the knowledge gained from testing over 1,500 pieces of kit (plus 100's of bikes) since starting out as a freelancer back in 2009. After first throwing his leg over a race bike back in 2000, Stu's ridden more than 170,000 miles on road, time-trial, track, and gravel bikes, and while he's put his racing days behind him, he still likes to smash the pedals rather than take things easy. With a background in design and engineering, he has an obsession with how things are developed and manufactured, has a borderline fetish for handbuilt metal frames and finds a rim braked road bike very aesthetically pleasing!

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