Carbon posts...worth it?

secretsam
secretsam Posts: 5,098
edited January 2014 in Road beginners
Currently got a (Cinelli) carbon bike with a Cinelli Vai 31.6mm Alu seat post

For more comfort, would a carbon post be a worthwhile investment? I have loads of seatpost on show so would provide some 'spring' (previous bike was a CAAD8 with limited post showing, was a bit harsh :shock: )

If it's a "yes", what's a good basic carbon post?

It's just a hill. Get over it.
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Comments

  • majormantra
    majormantra Posts: 2,094
    I doubt you'll notice much difference, especially with a cheap carbon post.
  • The only way you'll notice a difference is with a top of the range post, and even then more from the weight saving than anything else. You're talking £100-£150+ so not cheap.
  • racingcondor
    racingcondor Posts: 1,434
    I certainly noticed a difference when I went from a cheap carbon wrapped Alu post to a Deda SuperZero but that's not a cheap post (£90 on offer at the moment so not too bad considering the RRP).

    The problem is that a cheap carbon post will probably wither be Alu wrapped in carbon or just so overengineered that you lose the ride benefits (but the manufacturer knows they'll have a zero failure rate no matter what abuse they get put through).
  • Aluminium as well as carbon can be tuned to flex but as others have said such engineering doesn't come cheap.

    I used to have a Thomson Masterpiece setback post that was really comfortable but they have a weight limit of ~90kgs. I now have a Syntace P6 Hi-flex carbon which is also really comfortable but costs nearly £200 although I got mine half price from bike24.net.
  • You could use a shim and a smaller diameter post - 27.2mm dia will give you a lot of choice of posts, and the slimmer post will flex more than the larger diameter 31.6m post you currently have and hence give more comfort. Carbon or aluminium? well, as the others have said the more you pay the better engineered they are, and the more flex (in general) but it also proves the law of diminishing returns.
  • secretsam
    secretsam Posts: 5,098
    Seems like a "stick" is the best option, and a large dose of MTFU!!!

    Thanks all

    It's just a hill. Get over it.
  • 31.6mm seatposts and bars were brought in to be stiff and anything that is stiff will give little flex. I have changed a 31.6mm alloy post for a carbon one and guess what? It was still stiff.

    +1 to Jim's suggestion of inserting a thinner post and shims to gain some flex. You only have to see how everyone raves about the 'dales comfort (Carbon or Alloy) and the fact they use 25.4mm seatposts may not be a coincidence.
  • secretsam
    secretsam Posts: 5,098
    Where do you get these mythical 'shims'?? I have an old post (27.2) that I could drop in!

    It's just a hill. Get over it.
  • One place to look would be the very secretive and mystical....wait for it....keep the secret now....google "seatpost shims 27.2 - 31.6" or just go to CRC
  • me-109
    me-109 Posts: 1,915
    Tha instructions with my Scott carbon frame forbid the use of shims for posts. Don't know why, clamping forces maybe? Might be something you want to check.
  • keef66
    keef66 Posts: 13,123
    Me-109 wrote:
    Tha instructions with my Scott carbon frame forbid the use of shims for posts. Don't know why, clamping forces maybe? Might be something you want to check.

    I too was within a whisker of ordering a shim to transfer my carbon post to the CR1-SL when I read Scott's advice to the contrary. Annoying because the cheapo 31.6 alloy post I ended up with must negate some of the shock absorbing qualities of the CR1
  • me-109
    me-109 Posts: 1,915
    I did get an unbranded carbon post off the Classifieds here. It may well be Chinese but actually looks quite decent and the clamp is nicely adjustable, not stepped. Looks like a Bontrager XXX Lite Offset. Weighs 200g, compared to the 250g that the alloy one was. Not a significant amount, I know, but it is still as stiff and does actually damp out that little extra buzz. I wouldn't pay a fortune for one, but I was surprised that I could actually tell the difference with this one.
  • So you rate the Bontrager XXX one then? Surprised it weighs that much, as their site says it's more like 160g.

    I've been looking at that one because when I got my Scott CR1 frame they basically whacked in the cheapest seat post, so it's about 300g.
  • iPete
    iPete Posts: 6,076
    Switching from the standard alu to a Deda Drittissimo on my Allez was night and day different.
  • luv2ride
    luv2ride Posts: 2,367
    Putting a Specialized carbon pave seatpost on my aluminium Tifosi made a big difference, but you'd hope that your carbon Cinelli frame already deals with at least some road buzz. I also decided to stick with a 31.6mm (carbon) post on my Scott CR1 after reading the 'no shims' warning sticker on the frame. When I queried this with the supplier they advised "never to use a shim in a high end carbon frame". I'd check with the Cinelli distributor (Chicken Cycles?) as a smaller dia. post would undoubtedly be more comfortable.
    Titus Silk Road Ti rigid 29er - Scott Solace 10 disc - Kinesis Crosslight Pro6 disc - Scott CR1 SL - Pinnacle Arkose X 650b - Pinnacle Arkose singlespeed - Specialized Singlecross...& an Ernie Ball Musicman Stingray 4 string...
  • secretsam
    secretsam Posts: 5,098
    hmmmm..."Shims? Nein Danke" it seems, although I might check with Chicken and co.

    It's just a hill. Get over it.
  • me-109
    me-109 Posts: 1,915
    So you rate the Bontrager XXX one then? Surprised it weighs that much, as their site says it's more like 160g.

    I've been looking at that one because when I got my Scott CR1 frame they basically whacked in the cheapest seat post, so it's about 300g.
    I only said it looks like one. I've also seen the Bontrager listed as 160g. Mine was a hundred quid cheaper so I'm not complaining.
  • daniel_b
    daniel_b Posts: 11,568
    I have yet to use a couple of Ritchey wcs one bold carbon posts from crc, one inline, one setback.
    Iirc they were reduced a lot to around £65.
    Felt F70 05 (Turbo)
    Marin Palisades Trail 91 and 06
    Scott CR1 SL 12
    Cannondale Synapse Adventure 15 & 16 Di2
    Scott Foil 18
  • Monty Dog
    Monty Dog Posts: 20,614
    Depends a lot on the seapost IME - something like an Easton EC90 with offset is surprisingly forgiving for my 62kg whereas I have a FSA K-Force which is rock-solid. USE make a good range of shims - I have used a 27.2 post in a 31.6mm frame without issue - just make sure the shim is long enough to extend past the toptube/seattube junction which I guess is where the Scott concerns are.
    Make mine an Italian, with Campagnolo on the side..
  • mmacavity
    mmacavity Posts: 781
    You are using a saddle, aren't you ......?
  • secretsam
    secretsam Posts: 5,098
    mmacavity wrote:
    You are using a saddle, aren't you ......?

    :D

    Yes. In fact I've just got a new one which is much better, so may hold off on the carbon post

    It's just a hill. Get over it.
  • dennisn
    dennisn Posts: 10,601
    The only way you'll notice a difference is with a top of the range post, and even then more from the weight saving than anything else. You're talking £100-£150+ so not cheap.

    Just WHAT would he NOTICE from the weight savings? :roll:
  • The same as you would from any weight savings.
  • secretsam
    secretsam Posts: 5,098
    It's not about saving weight, with my lardy ar53 sat on the bike, any weight savings are really a drop in the ocean :D

    It's just a hill. Get over it.
  • dennisn
    dennisn Posts: 10,601
    The same as you would from any weight savings.

    You can NOTICE 20 or 30 grams difference in your bikes weight? :roll:
  • How much meets with your approval then 20g, 200g, 2kg, or it's all meaningless might as well tow a concrete block around. Although that's not a bad idea for training...
  • dennisn
    dennisn Posts: 10,601
    How much meets with your approval then 20g, 200g, 2kg, or it's all meaningless might as well tow a concrete block around. Although that's not a bad idea for training...

    I admit that kind of thinking leads to you buying carbon chainrings, carbon bar end plugs, worlds lightest frame, etc. and that all those things do have a payoff. You'll improve your local race finishes from 15th to 14th.
  • BillyImp
    BillyImp Posts: 130
    Just fitted a new carbon finishing kit on my road bike. Have to say I barely notice a difference on the seat post when riding but can definitely feel the weight saving towards the rear though as my old seat post was a real hefty piece of metal. Well impressed with carbon bars/stem though, they've made a real difference where I didn't think they would, loads stiffer.
  • My seat post weighs about 300g which I believe for a seat post is a lot. Once (if!) I get to my target weight I'll treat myself to a lighter one ;)