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  1. #1
    just a guy who rides bike
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    BMC Seatpost Question

    Hey all, just got a new BMC SL01 in the mail from CC, and my god is it a nice looking bike. I sized it out with the CC website, and also looked on the BMC website to make sure it was the correct size. I am 5' 4.5", and the BMC website says the 47cm accomidates riders from 155-165cm, or 5'1" to 5'6" or so... Well I just dropped the integrated seatpost in and it is just at the cusp of being too tall, and I cannot figure out how to make it go down any further... the bike didnt come with a specific info sheet on the seatpost. So the seatpost is right at the 16cm, and i cannot figure it out. If it can accomidate a rider that is 4 inches shorter than I am , it must go down further... or do we cut it?

    Any and all help would be appreciated. For those of you who are not familiar with the BMC seatpost, it is a proprietary design, so most reason about seatposts does not come into play with this one...

    thanks all!

    The snow is finally melting in Minneapolis!
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  2. #2
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    Let me see if i understood the problem...u have to get the seat down right? just move the bolt that is in the upper part of the seatpost to the open position and thats it... No u can not cut it.

    Wonder if you notice that the bolt says open and close... click it to open.. once in position click it to close.. done.

    Do not put grease to it also. Secondly the box u got with the manuals has the instructions for the seat post also just in case. Look for it but it is not needed this system is pretty much straight forward to understand how it works.
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  3. #3
    Senior Member mzeffex's Avatar
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    You probably just need to loosen it more.
    Quote Originally Posted by rjones28 View Post
    Are they talking about spectators feeding the cyclists? You know, like don't feed the bears?

  4. #4
    Bike ≠ Car ≠ Ped. BarracksSi's Avatar
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    Unless you have stubby legs, or you're trying to ride with bent knees, it should be okay. You don't have any problem fitting on other frames with a seat tube of similar height, do you?

    How far down are you trying to set it, anyway? Got a pic?

  5. #5
    Junior Member Sonicfish's Avatar
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    I've got a BMC Pro Machine as well. Good choice you'll love it.

    I'm guessing you need to cut. Whatever you do, don't over-tighten those seatpost bolts! Get yourself a torque wrench for it. Shortly after I got mine a guy stopped to talk to me about my bike. He over-tightened his and had to buy a new frame.

    The snow is finally almost gone here - riding tomorrow.

  6. #6
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    Hope he is not putting the seatpost in the locked position and have it already half way in because that means only one thing

  7. #7
    Senior Member hansel's Avatar
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    why are people saying to cut the seat post? the integrated streampost is just a 1 bolt operation maybe 2 if you need to tighten the wedge. if you need it shorter than just undo the allen key at the top to the open position and move it to the desired height. than make sure you move it to the closed position, and make sure its all the way closed. and if your riding with it at the 21-23 marks you will notice that it moves laterally ALOT when riding, but thats normal.
    "Its a circus, and i dont want to be one of the clowns" - Chris Boardman

  8. #8
    just a guy who rides bike
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    Folks, thanks for the responses. I know how stems work, and I am not trying to put in in in the locked position. The bike has a cutout for the rear wheel that appears to cut off the ability for the seat to go any further. See a pic here. This would not be the case with a 54 cm or such, but with a smaller frame it is happeing. Anyone have a 47 cm BMC out there?

    And no my legs are not really stubby, they are just regularly stubby. I have been riding a 50cm pinarello for the past few years.

    Thanks all
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  9. #9
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    BMC makes 2 seat post for the bike call CC and let them know you need the smaller one, had to do this for my son's.

  10. #10
    Bike ≠ Car ≠ Ped. BarracksSi's Avatar
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    Quote Originally Posted by matthewayres View Post
    And no my legs are not really stubby, they are just regularly stubby. I have been riding a 50cm pinarello for the past few years.
    That was an honest remark, not a slam on you. I've got a friend who's 5' and has an inseam of maybe 21-22" -- her torso looks longer than her legs.

    Check with what saintx said; I didn't know that BMC made shorter Streamposts. That'd be the right fix.

  11. #11
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    You can cut that post, its just harder. Its just like how you cut a quill stem, cut it at an angle.

    But if there is a shorter post option, might be better to just swap posts.

  12. #12
    Senior Member mzeffex's Avatar
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    ^ but then there would still be the shaft sticking down, which might get in the way.

    Get the smaller post.
    Quote Originally Posted by rjones28 View Post
    Are they talking about spectators feeding the cyclists? You know, like don't feed the bears?

  13. #13
    just a guy who rides bike
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    Here are some pics of the issue...
    Attached Images Attached Images
    Super fancy bikes.

  14. #14
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    Oh now i see... is that the small size frame right? As somebody mentioned, BMC has a short streampost also, maybe u need that one, wonder if the bike comes in xs or something just in case but CC should be able to send you the shorter one.

    http://npbikeshop.com/product/bmc-st...t2262-qc71.htm

    http://www.bikeman.com/Rigid_Seatposts.html

  15. #15
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    Hey Matt what happened??? did u get a new seatpost from cc??

  16. #16
    I don't even own a cat... invwnut's Avatar
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    is that with your cycling shoes on? Will the cleats give that reach you need?
    2008 LG Sonix 6.4, 2002 KHS Flite 500, 1999 Big Sur Gary Fisher

  17. #17
    just a guy who rides bike
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    Just an update: Tim at Competitive Cyclist says I need to purchase a new $300+ seatpost to make the bike fit. This is a bike that was listed on the BMC website as fitting 155-165cm and Tim looked at my fit chart and agreed this was the bike for me. Well I am 164cm and the seatpost is too tall for someone my size. THe top of seat to top of pedal is around 30.5 inches, and my inseam (and the inseam of most people 155-165) is a bit smaller than that. I am hoping that it was an honest mistake on the part of CC and that they will rectify this situation, but if not I will let you all know. I cannot believe they want me to spend $300 more just to make a bike that is supposed to fit actually fit. Thoughts? Advice?
    Super fancy bikes.

  18. #18
    Bike ≠ Car ≠ Ped. BarracksSi's Avatar
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    Quote Originally Posted by matthewayres View Post
    Thoughts? Advice?
    Thought: Grr. Sounds like it came with the wrong seatpost already.

    I'm assuming that this isn't your first bike since puberty and that you know how high you should be sitting anyway, so I can't quickly proclaim, "Dude, you can't be sitting on it with your feet flat on the ground."

    What I'm curious about is the actual difference in length. How long is yours, and how much shorter is the short post -- did CC have that info?

    Advice (ha.. right): Make them take back the post and trade it. They can stick it in a demo frame if they want. Whether BMC or CC eats the cost, I don't care.

  19. #19
    just a guy who rides bike
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    Okay, one more update, better news this time. I just received this email from Tim at CC:

    Scratch that. One of our product managers came up with an alternative solution late this afternoon, and you should have a new short seatpost for free some time toward the middle of next week. Sorry about the delays, confusion, ultimately false information, etc. I hope this solves the fit problem, and thanks for your patience Matthew.

    So I am happy for now, will let you know when it comes in...
    Super fancy bikes.

  20. #20
    just a guy who rides bike
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    Quote Originally Posted by BarracksSi View Post
    What I'm curious about is the actual difference in length. How long is yours, and how much shorter is the short post -- did CC have that info?
    Apparently the short seatpost is 2.5 inches shorter, making it 11.5", and the regular one 14"... I assume the short one comes with the small and the xs, as the cutout to accommodate the rear wheel is in the way on those models.

    Quote Originally Posted by BarracksSi View Post
    I'm assuming that this isn't your first bike since puberty?
    Good lord I hope I am done with puberty although I wouldn't mind growing a few inches (then I could just fit on the seatpost I have!)... I am 33 and probably through it though.
    Super fancy bikes.

  21. #21
    Bike ≠ Car ≠ Ped. BarracksSi's Avatar
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    Quote Originally Posted by matthewayres View Post
    Okay, one more update, better news this time. I just received this email from Tim at CC:

    Scratch that. One of our product managers came up with an alternative solution late this afternoon, and you should have a new short seatpost for free some time toward the middle of next week. Sorry about the delays, confusion, ultimately false information, etc. I hope this solves the fit problem, and thanks for your patience Matthew.

    So I am happy for now, will let you know when it comes in...
    Cool. I'll bet he sat back after sending the previous email and was thinking, "We're screwing this guy -- can't we do better than making him buy a new one?"

  22. #22
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    OK ... im happy now
    Last edited by ultraman6970; 03-10-10 at 06:49 PM. Reason: all erased

  23. #23
    Bike ≠ Car ≠ Ped. BarracksSi's Avatar
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    Quote Originally Posted by ultraman6970 View Post
    IM impressed with CC... sad
    ... Read the thread.

  24. #24
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    Hey Matt are you going to post pictures of your bmc?

  25. #25
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    Hey Matt are you going to post pictures of your bmc?

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