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  1. #1
    Senior Member Heraclitus's Avatar
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    Evolution seatpost for Brompton

    This seems like a good price on an aftermarket telescoping seatpost for the Brompton.

    XL Brompton Seatpost

    Plus it eliminates the need for a pentaclip if I want to use a regular saddle. I could probably get decent setback in the saddle adjustment from it. Anybody know of it? Arguments for or against? I am tall and I want to get a little more altitude and stretch in my riding position.
    Nothing endures but change.

  2. #2
    45 miles/week Eggplant Jeff's Avatar
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    How is it different from the stock Brompton telescoping seatpost (other than the 2-rail clamp)?

    I'll definitely need a telescoping seatpost one way or another .
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  3. #3
    Senior Member Heraclitus's Avatar
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    Same idea, but $5 cheaper and you can use a (normal, non-brompton specific) single rail saddle. I suppose my main questions is if anybody might have any info or would raise any quality concerns. It seems like the only place I can find that seatpost in the entire world wide web is at Calhoun Cycles... which seems a little odd.

    On the other side of the issue, I am debating if I should shell out big $ for a titanium seatpost for greater strength, which might allow me to move the seat back further (I am thinking of reversing the seatpost adapter) and worry less about bending it...Or I could go cheaper and heavier, and use the SAP on a normal telescoping seatpost, and perhaps reinforce it with a wooden dowel as some have suggested.

    Or the best option might be if I could get a satisfactory amount of set-back on the clamp version of the Evolution seat post without further modification!
    Nothing endures but change.

  4. #4
    Seņor Mambo
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    I think Calhoun's Evolution line are in-house products, meaning they make or have a local maker make the products (or design them in-house at least), so I don't think you'll find them anywhere else. They have a pretty good reputation in the recumbent world.

    As far as the Evo Brompton seatpost goes, it's a two part item right? Is there a possibility of putting in a 27.2mm setback seatpost into the sleeve? If so, that might provide the setback you need.

    Or you can use the old fashioned adapter to get setback, about 1 - 2" (see below).

    Ti might be strong, but it should also be flexy, no?
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    Last edited by spambait11; 03-22-06 at 03:06 PM.

  5. #5
    Senior Member Heraclitus's Avatar
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    Quote Originally Posted by spambait11
    I think Calhoun's Evolution line are in-house products, meaning they make or have a local maker make the products (or design them in-house at least), so I don't think you'll find them anywhere else. They have a pretty good reputation in the recumbent world.
    That explains it. Thanks for the feedback.


    Quote Originally Posted by spambait11
    As far as the Evo Brompton seatpost goes, it's a two part item right? Is there a possibility of putting in a 27.2mm setback seatpost into the sleeve? If so, that might provide you the setback you need.
    Yes, it is two parts. Good idea. I will explore that option. It seems like I would reduce some of the hardware and weight if I could do without the seatpost adaptor and the pentaclip.


    Quote Originally Posted by spambait11
    Or you can use the old fashioned adapter to get setback, about 1 - 2" (see below).
    This is what I was thinking of doing originally, and still seems like a good option. Decisions... decisions... Is that a normal or extended seatpost? Have you had any concerns about bending the seatpost with the saddle adapter on "backwards"? I weigh about 190 lbs. Right now I have an extended, but it is a bit too low. It may be possible that I can get close to enough height with the saddle adapter, but I am pretty sure I need a telescoping seatpost. (I am 6'4" tall.)


    Quote Originally Posted by spambait11
    Ti might be strong, but it should also be flexy, no?
    This did not occur to me. I have not had a ti seatpost before. Thanks again for the info - more to consider.

    Also - I like the power grips! Were those tricky or technical to install? I think I would like to add some to mine. I have never actually used them before, so I don't know what it would entail. But I have heard good things about them. I am very used to riding clipless and I think that I would really appreciate those for the Brompton.
    Nothing endures but change.

  6. #6
    Seņor Mambo
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    Quote Originally Posted by Heraclitus
    Is that a normal or extended seatpost? Have you had any concerns about bending the seatpost with the saddle adapter on "backwards"? I weigh about 190 lbs. Right now I have an extended, but it is a bit too low. It may be possible that I can get close to enough height with the saddle adapter, but I am pretty sure I need a telescoping seatpost. (I am 6'4" tall.)
    It's an extended seatpost. I opted for this because it is supposedly thicker than the standard seatpost, and I didn't think I needed a telescoping one. Since I bought it from foldabikes, Channell made me test ride it first before he sold it to me, and was the one who told me to reverse the saddle adapter if I wanted more setback. When I asked him about it breaking, he said he never heard of it happening. So far, for me, it has held strong and I see no signs of fatigue or cracking. (I'm 5'10", 210lbs. so you know I was checking.) I've used it primarily for commuting on relatively flat ground/low grades, 17 miles round trip. I think the elastomer helps to take a lot of the direct shock away.


    Also - I like the power grips! Were those tricky or technical to install? I think I would like to add some to mine. I have never actually used them before, so I don't know what it would entail. But I have heard good things about them. I am very used to riding clipless and I think that I would really appreciate those for the Brompton.
    That's funny! I started with PowerGrips but have changed over to SPDs on all my bikes within the past 3 months.

    PowerGrips are easy to install, but not when it comes to folding pedals! The pedals pictured are MKS AR-2 quick-release pedals.

    For Brompton's specific folding pedal, the most I could attach were mini-toe clips since a longer screw or bolt would interfere with the folding mechanism. I used a small sheet metal screw and loctite, but quickly abandoned these pedals.

    I then tried a pair of MKS FD-2 folding pedals and could install the Grips (had to grind some of the pedal away first), but these pedals were heavy and ugly, so I switched to the lighter AR-2s. They've now been replaced by SPDs. The only thing I miss about the Brompton's pedal is that, when folded, it really made the overall package easier to carry - i.e. no pedal hitting your thigh while carrying the bike around.

  7. #7
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    Quote Originally Posted by spambait11
    As far as the Evo Brompton seatpost goes, it's a two part item right? Is there a possibility of putting in a 27.2mm setback seatpost into the sleeve?
    The top of a Brompton telescopic seatpost is not 27.2 diameter. I can't recall off the top of my head but it is 26.something

  8. #8
    Senior Member Heraclitus's Avatar
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    Quote Originally Posted by LWaB
    The top of a Brompton telescopic seatpost is not 27.2 diameter. I can't recall off the top of my head but it is 26.something
    FYI - I went straight to Calhoun Cycle and this is what I learned:

    "The Evo XL Seatpost for Brommie's uses a standard 27.2mm seatpost as the top post (the one that the seat attaches to), so yes, you would possibly be able to find a custom post for your application that might work even better than stock unit.

    The Clamped version is definitely set back when compared to the stock Brommie set up (just as you were thinking), so likely you wouldn't need to chase out a different seatpost, but the option would be there. The seat stub that Brompton uses to move the seat back would be similar to using the Evo unit with a clamped saddle and then adjusting the saddle back (away from the handlebars)."

    I am going to get one. Sounds like just what I need.
    Nothing endures but change.

  9. #9
    Seņor Mambo
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    Yay for some semblance of standardization! And Calhoun are good people too - great place to order from.

    Thanks for the info.

  10. #10
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    Quote Originally Posted by Heraclitus
    FYI - I went straight to Calhoun Cycle and this is what I learned:

    "The Evo XL Seatpost for Brommie's uses a standard 27.2mm seatpost.
    I was referring to the Brompton factory seatpost. Obviously, I didn't read the relevant post well enough.

  11. #11
    Folding bike junkie! Wavshrdr's Avatar
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    If you need something checked out in person I don't live far from Calhoun Cycles. I can visually inspect something if need be. I am generally there at least once a week. Either a recumber or folder related excursion is required.

    I have the Brompton telescopic seat post and I've been quite happy with it so far. I like the fact that I can pop of the top post quickly with the seat and it packs much more quickly in my suitcase.

  12. #12
    Senior Member Heraclitus's Avatar
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    That's excellent wavshrdr - thanks. I think you must be lucky to live near enough to visit a bike shop that specs out custom brompton seatposts and sells Brompton accessories. (I am truly stunned that there is no such place amongst all 15 million of us here in Los Angeles!) But I feel pretty good about this one and am comfortable going ahead with the purchase.

    I amaze myself with the hours I spend agonizing over a few bucks here and there - calculating shipping costs and taxes etc. - not to mention how I try to imagine how I will feel about my bike related purchases... I could go on. (If I can get service and advice locally I am happy to do so as well.)

    Anyway, this seems like a good deal, with the functionality I need. The only competition is a possible telescoping seatpost of similar design from Len Rubin, but he has not responded to my latest emails, and though the option at hand may make my Brompton a wee bit heavier, it will leave my wallet a bit heavier too. And both will still be much lighter than my old steel fixed gear that I love to crank around LA and up some big old hills. And at present I can still better afford to lose a pound of my own by riding bikes a pound heavier, as easily I can buy titanium parts to take a pound off the bike itself.

    And I agree with Spambait11 - praise standardization and cross compatability! As was mentioned in another post that is going round... shame on Brompton for resting on their laurels. I look at all the inspired tweaks and modifications that a few people are doing to these fundamentally elegant devices and I am disappointed that the Brompton business model seems to be aimed at thwarting further innovation rather than encouraging it (but I appreciate the market for what it is, and what it can become as well)... it does makes me wonder at the mix of luck vs. true inspiration that gave birth to the Brompton. Still, I love what it is, and I want to make mine the best it can be (without feeling ripped off!) I don't think I will be able to step up and chase down Merc-Brompton Alu-titanium hybrids etc. as quickly as you are in a position to do, but I can imagine that this is only the first iteration of my exploration of what I can do with this excellent device.

    I hear what you have been saying about how it sort of sucks you in to upgrading and improving and refining... it is really not an intelligent economical decision, but it is fun and fascinating nonetheless. There is an inherent beauty and quality of design in the Brompton. But the B is also my entry into the world of folders in general. Perhaps my next ride will be a Swift (a bike that I can spec out with plenty of options for parts and mods that I can find to suit me, no?) ... something to do while Brompton steps up to the plate against Merc... or that new Dahon...?

    Cheers
    Last edited by Heraclitus; 03-25-06 at 02:50 AM.
    Nothing endures but change.

  13. #13
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    Any reports on those that may have gotten the telescoping seatpost from Calhoun?

  14. #14
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    Quote Originally Posted by jasong View Post
    Any reports on those that may have gotten the telescoping seatpost from Calhoun?
    For those following the thread, I had purchased one of these, and I believe it's an exact retrofit from an original Brompton seatpost. They've cut a slot, drilled the stress release hole, and added a shim and a collar. The finishing wasn't great which seems to imply their own retrofit. And the look of it is exactly (down to every detail) like the original Brompton post (and same length, and cutting off the top nub).

    Tip for those that have just bought a brompton: retrofit your stock seatpost to accept a 27.2 standard post (20-30 minutes). Shims are around $8 online and the collar around $6.

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