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USE Alien Carbon Seatpost

The USE Alien carbon post is one of the industries lightest designs due to the use of the Cyclops head and careful bonding process of the alloy head to the seatpost.

The light stiff and strong shaft is made from 3K weave carbon that has a matte finish applied after fabrication. The head is bonded on using the 3M bonding technique. The Cyclops clamp shaves a lot of weight and is one of the reason the post tips the scale as a featherweight.

We have found the USE carbon posts to be one of the more durable and robust designs available. The unique Cyclops clamp is light and incredibly strong. First time set up can be a slight challenge, but once you have a little experience with it, it installs and adjusts easily. 3K carbon with a matte finish has an industrial look to it and is durable for daily use. The Cyclops clamp is fabricated from 7075 heat treated and anodized alloy.


  • 3K carbon weave
  • Matte finish
  • 3M bonding
  • Machined Cyclops head
  • 10mm setback
  • 152 grams
  • $99.88
    Reg Price $169.95
    Item #: 248120 Weight: 172g


    Average Rating:


     Anonymous : 

    I've had this post now since 2006 on my primary road bike. I've used various saddles with it, and I've never had a problem. Yes it will tilt as you tighten it, but it's a minor nuisance for a great post.


     Anonymous : 

    I've used this post for three years without any problems; reading all the reviews, perhaps I'm one of the lucky ones. True, it is a pain to mount and adjust, and I am a serial over-torque-er so I had to really put in check my desire for just one more quarter turn when tightening the bolt. That said, the saddle and post have not moved one millimeter. The saddle does tilt down several degrees when you tighten the the bolt but if you just set it too high to start it sits perfectly. I've yet to find a lighter post (mine weighs ~140g with excess trimmed) at this price point so, for me (and my lack of mechanical problems with it), it all boils down to how much consternation in putting the saddle on I want to deal with for saving a fair amount of weight.

    Pros: light weight for a zeo offset post

    Cons: Need patience and a good vocabulay to mount saddle


     Steven Allen : 

    A bit of a challenge to setup without a few curse words. I bought my single bolt post in Dec 2010. I just found the middle hardware piece has cracked. I would expect a post to last longer. My weight has been 155-162lbs. At this stage, the saddle tilts back over the course of a few rides. I've torqued it as much as I dare with the small bolt. Maybe the loctite I just added will do the trick?

    Pros: Looks good, light, worked well for a couple years

    Cons: Challenging setup, short lifespan


     Anonymous : 

    Forget about it. There are plenty of posts out there these days that are just as light and far easier to adjust. Regardless of what anyone says, these are so time consuming and finicky to set up (even with someone who has set m,any of these up before), that these just aren't worth it. The smallish hex bolts also round off, even when you are careful to fully insert a new and square hex wrench. Stay away and thank me later.


     Anonymous : 

    This post is horrible. Period. I bought it for a "weight project" bike and it was a pain the the butt straight out of the box. I got it adjusted finally, then when I needed to move the saddle (fine tune the fit), it took 15-20 minutes each time I wanted to tweak the saddle fore-aft. The seat angle is a total guessing game. Start with the tip up because as you tighten the bolts, it pulls the nose down. In the end I now realize that this post design is about 10 years old and was super light at the time, now there are other posts available that are as light which I should have gone with.

    Pros: light

    Cons: time consuming, frustrating


     Anonymous : 

    This post is strong and durable but the set-up is time-consuming. The 2 thin fixing bolts have heads that require a 1-mm hex wrench that takes forever to tighten, and this size wrench tends to slip when near the recommended torque.

    This is a review on the origianl (older) USE Alien seatpost design, that used two bolts. The current USE Alien design has one bolt and has been availible in this design since 2005. Also the wrench required for the older Alien seatposts were 2.5mm, not 1mm as posted. - ed

    Pros: light, strong, clean design

    Cons: Set-up and adjustment is too time-consuming.


     Anonymous : 

    Crap absolutely crap... same problems as stated before! The double hex saddle will fall off when weight is shifted anywhere backwards. Twice now even after thoroughly tightened. Only a few bumps and bruises... Good thing!

    6/8/2011 10:53:15 AM

     Anonymous : 

    Mine became frozen in the wrong position: bike mechanic told me to loosen the bolt all the way (it will not pull through as a washer stops that) then whack the saddle/rails hard with a rubber mallet. Worked for me. This was is a pain to adjust, but works well once in the right spot.

    6/8/2011 10:33:00 AM

     Anonymous : 

    I agree that this post slips easily. Mine slipped after adjusted at the shop, then stuck on a ride pointing up, and I could not readjust for many miles with my small wrench. Otherwise it’s a fine, strong, lightweight post.

    4/3/2010 5:52:37 PM

     Anonymous : 

    I have used the Alien post for 4 years, yes it is difficult to adjust, once set it never moved. Recommended the post to friends, same criticism but did not move and seat didn’t pop off. My girl friend with no bike mechanic skills installed the post on all her bikes, same criticisms, same result, Pay attention when installing the post, then forget it, works great

    9/12/2009 9:19:08 AM

     Anonymous : 

    I have the old style Alien with two adjustment screws. It was installed in 2004 and performed flawlessly until the middle of an important ride in 2007. I took it back to shop where purchased and again everything went well until the summer of 2009. Once again the seat moved during a ride and since I had moved I could not take it back to the LBS where purchased. Took to another shop and mechanic were clueless on the torgue. One kept tightening until he broke on of the alloy bits that tightens on the rail. I did not realize the piece was broken so the post failed about 5 miles into a ride so I had to pedal back without a saddle. Needless to say I am conflicted on whether to keep the post of not. When it works it is great but when it fails it sucks.

    9/1/2009 7:50:56 PM

     Anonymous : 

    Comical how emotionally invested people get in things.This seatpost is beautiful to look at and is very lightweight. But despite careful installation by me and my LBS, torque wrench or no, the saddle pops off while riding. Just look at the design and you can see how it’s possible. Why bother? Look at the Thomson. It’s brilliantly designed and constructed. Campy too.

    8/27/2009 7:45:03 PM

     Anonymous : 

    I am amazed at the bad reviews, but, every person is different. This the is the best post I have owned, and I have tried most of them! It is tied for number 1 with the bontrager post line for easy adjustment. It has a horizontal adjustment just like the bontrager, except it is from the back, the bontrager is from the side. Most other posts require tightening from underneath in a manner that is just not that easy to do (post always gets in the way especially when using a tri allen wrench). This post does not. My only two complaints on this post would be, and I am int picking here.. It is too adjustable. Most other posts have clicks, this is smooth so it takes more time to get it completely perfect. It appears to compress the seat mounting rails, although they always uncompress when the post is released. When I say compressed I mean bend, like bending a straw not squishing a straw. If I had the money, all 8 of my bikes would have this post or the bontrager race xlite.

    7/11/2009 10:50:47 AM

     Anonymous : 

    I have owned this post two years and always found this post difficult to adjust properly. The bolt is too small to tighten very much. Today, it slipped mid-race causing me to drop out despite careful assembly. I am now online shopping for a replacement. I have never had a post fail in decades of riding. My advice, avoid this one.

    2/18/2009 7:39:55 AM

     Anonymous : 

    I’m an engineer and I can’t get this thing to work! I replace my saddle about every year and after three years I’ve finally decided to throw out this seat post. It is very difficult to install (although I think it’s more difficult with certain saddles) and very difficult to adjust. Sure - it is light weight and cool looking, but that does nothing for you if you cant physically get the saddle on your seat post and into the proper position.

    2/10/2009 7:55:14 PM

     Anonymous : 

    I’ve had this seat post for five years and it is great. No, if, ands or buts. I have Thomson Masterpiece and it is easier to adjust but, heavier. I have the two bolt version and went to a company called Fastenal to buy stainless steel bolts to replace the originals that had rusted. Otherwise, if you can’t adjust the USE post you must have hand like feet.

    10/26/2008 6:33:47 PM

     Anonymous : 

    I bought this particular seatpost because I liked the way that the saddle rails are better supported than many other light weight seatposts. After reviewing all the reviews here and on the online forums I decided to risk it anyways. Many have said the cyclops clamp is difficult to adjust. I do not find it so. Max torque on the small 3mm hex head socket cap screw is 3.5 NM. I would highly suggest using a good high quality torque wrench for this. A bolt that small in diameter can easily snap if over torqued. The entire clamping design relies also on proper torque on the faster to generate the proper clamp force on the clamping head of the seatpost portion. I gave it a 4 out of 5 stars because the description here at Excel sports and as well on USE’s own website doesn’t tell you right away that you may need to buy a 2nd cyclops clamp of different size if you have carbon rails

    7/16/2008 8:26:46 PM

     Anonymous : 

    I like a post that goes about its job without too much fuss. This one does not. The clamp fails to inspire confidence; one 3mm bolt to hold a saddle is barely adequate. I have had it slip and had the bolt loosen, which makes for a worrisome ride. Also the saddle is difficult to install by comparison to Ritchey, Campy, Thompson - you need three hands to do it. A regrettable choice overall.

    6/25/2008 8:36:07 PM

     Anonymous : 

    I have one. Once it’s set (after MUCH aggravation), it stays put. It’s light and it looks good but there’s one simple fact:Simpler is better and there’s no seatpost clamp as simple, elegant and strong as Campy’s and all these multi adjustment or multi piece clamps are a complete joke.

    6/23/2008 6:34:09 PM

     Anonymous : 

    I just installed this seatpost today - anyone who says this is easy to install must be someone who works for USE. This is the worst seatpost I have ever worked with in 25 years!

    6/4/2008 1:13:29 PM

     Anonymous : 

    The USE Alien seatpost is very easy to use. It just requires a bit of patience, and understanding of the direction of rotation of the saddle while doing it up. You have to angle the saddles nose slightly downwards, so that when you tighten the clamp the nose of the saddle will lift. Make sure the clamp is tight (torque to numbers rec), and it won’t move and should need no fine tuning. It really is easy and takes a bit of practice and patience.

    4/30/2008 8:26:54 PM

     Anonymous : 

    I second the reviewer who said the post is a pain to adjust. I have a problem with it holding adjustment and it can’t be adjusted on the fly.

    4/9/2008 7:30:15 AM

     Anonymous : 

    I’ve used this seatpost for the last 8 months on my Storck CD1.1. It is a fantastic post. Extremely well made and not at all difficult to adjust.

    2/25/2008 10:52:44 PM

     Anonymous : 

    I would give this seatpost a zero if possible. The post itself is fine - still, lightweight, reasonably priced. The saddle clamp, however, is extremely complicated and difficult to install. I’ve installed three different saddles on this post and have had to spend at least an hour on each to adjust it and get it in the proper position. The one bolt concept is a good idea, but is impossible to make slight adjustments to and requires way too much time to install. I wonder if the product designers have ever actually put a saddle on it to try it out....