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  1. #1
    Ole
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    315g dropper post

    Any thoughts? Just the amount of travel I need for my XC bike.

    https://r2-bike.com/JBG-2-Dropper-Seatpost-316-mm-60-mm

  2. #2
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    I could get away with 60mm drop as well, incredible weight but $1315 shipped (thats no VAT) to Canada is a little much.
    Last edited by xc71; 02-16-2018 at 06:05 PM.

  3. #3
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    Quote Originally Posted by Ole View Post
    Any thoughts? Just the amount of travel I need for my XC bike.

    https://r2-bike.com/JBG-2-Dropper-Seatpost-316-mm-60-mm
    60 mm is not too bad (if you are a short guy). At 5'8" with a 125 Revive I put my feet almost flat on the ground and most of the time I am using maybe 80-100.

    But the cost is a bit ridiculous ... 1000 Euros (830 without Vat) ....

  4. #4
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    You get a wooden box though.

  5. #5
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    I searched through the website and saw nothing about a warranty policy. From the outside it looks like a gravity dropper post. GravityDropper Adjustable Height Seatpost except the carbon. Bit I would ask some questions (Internal mechanism, schematics, service, WARRANTY) before dropping (pun intended) so much cash on the item.
    Yeti SB95C
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  6. #6
    ccm
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    seat clamp will not work with carbon fibre rails and for that type of clamp will just fatigue and break over time (so add 20 to 30 g for a proper clamp)
    cable and housing are ultra light and will likely need to be upgraded to prevent stiction
    (so add another 20 g)
    really this post is just for scale queen photos

  7. #7
    Formerly of Kent
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    Quote Originally Posted by ccm View Post
    seat clamp will not work with carbon fibre rails and for that type of clamp will just fatigue and break over time (so add 20 to 30 g for a proper clamp)
    cable and housing are ultra light and will likely need to be upgraded to prevent stiction
    (so add another 20 g)
    really this post is just for scale queen photos
    Can you explain why it won't work with carbon rails?

    I've used that kind of rail clamp with carbon rails without any problems.

    Also, can you explain why the housing won't work? I've been using Alligator I-Links with my dropper for over a year. No problems. It's about half the weight of standard housing.
    Death from Below.

  8. #8
    ccm
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    clamp appears to be same as many other super light weight clamps of the 1990s
    an aluminum cylinder cut length wise in half then four notches machined/filed in
    support surface would be about 3 to 4 mm per rail
    most carbon rail saddle manufacturers recommend long (like 20 mm or more) rail support cradles
    around here on the wet coast, most cyclists have given up on any housing except for Shimano for real rides of 4 hours or more in the rain and mud

  9. #9
    Ole
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    I see carbon cradle with full length support, and it appears the housing is standard. The post alone weighs around 220g, so almost 100g of remote lever, cable and housing doesn't sound unreasonable.

    315g dropper post-jbg-2-dropper-seatpost-316-mm-60-mm_4.jpg

  10. #10
    ccm
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    minimum 32 mm top and bottom
    How to Fit the Selle SMP Saddles -* Albabici cycling products

    and 220 g for post alone sounds like a light weight non-dropper post (so with a least another telescoping tube alone, must be very thin an flexy and will likely be binding when you try to drop)

  11. #11
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    Quote Originally Posted by ccm View Post
    minimum 32 mm top and bottom
    How to Fit the Selle SMP Saddles -* Albabici cycling products

    and 220 g for post alone sounds like a light weight non-dropper post (so with a least another telescoping tube alone, must be very thin an flexy and will likely be binding when you try to drop)
    220 grams is not a lightweight post and should only be used for hanging off the side of the Queen Mary ); 90 grams would be considered a light weight post.
    https://www.schmolke-carbon.com/product/seatpost-tlo/

  12. #12
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    Seems like a reasonable price for what you get.

  13. #13
    ccm
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    Quote Originally Posted by xc71 View Post
    220 grams is not a lightweight post and should only be used for hanging off the side of the Queen Mary ); 90 grams would be considered a light weight post.
    https://www.schmolke-carbon.com/product/seatpost-tlo/
    perfect example of the type of clamp that failed back in the 1990s, even for solid metal rail saddles
    Syncros and RaceFace changed to more Thompson like cradles

  14. #14
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    Quote Originally Posted by ccm View Post
    perfect example of the type of clamp that failed back in the 1990s, even for solid metal rail saddles
    Syncros and RaceFace changed to more Thompson like cradles
    Its a full lower rail support.
    Not sure why your stuck on some of these that failed in the 90's, they are used on most light weight posts and they are very reliable. I have run this style of post on several bikes over the last 20 years and I have never had one fail.

  15. #15
    Ole
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    wow, that Selle SMP saddle seems like a very fragile saddle. I have been using sub 100g saddles for 15+ years on my xc race bikes, with similar clamps as the JBG post with zero rail failures. I don't even know why the seat clamp is being brought up, it's an extremely well tested design with few problems, and the part of the JBG post I am least worried about.

  16. #16
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    There have been issues reported with cradles like the KCNC one.

    Name:  kcnc-cradle-rocker-for-ti-pro-lite-seatpost.jpg
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    They make this adapter designed to meet the needs of carbon railed saddles. Every contact point on the saddle is lengthened providing more contact surface and reducing any chance of scarring the saddle rail. The cradle itself is also longer, giving the clamp a larger footprint and support area.

    315g dropper post-56550ef1e4b0c7636148749f.jpg

    That being said, the JBG cradle isn't like the regular KCNC one. It offers full lower rail support. It looks exactly like the MCFK cradle. I've never heard of anyone having any issues with that one. I've been using a MCFK seatpost myself for 5 years.

    Name:  171_shop1_796796.jpg
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  17. #17
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    315g dropper post-ccs-62657-0-77422700-1491304366.jpg

    I have seen this seatpost last years at the cape epic. It was on a frm bike.

    You can see more pictures here:
    https://www.bikehub.co.za/features/_...pe-cobra-r6379

    FRM is working on their own (or next) version which seems more beefy:
    https://www.facebook.com/frm.bike/vi...8265747646338/

    It is an extreme product, I would not recommend it unless the rider is less than 160/170 pounds which is on the heavy scale for pros.

    Same with those saddle clamps... they work fine as long as the rider weight it is within a certain limit...
    They are not the same as the ones from the 90's as the clamps are further apart and post diameters nowdays are wider as well. I would not buy it from any company that makes a 27.2 version.
    30.9 and 31.6 are fine.

  18. #18
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    Quote Originally Posted by sfer1 View Post
    ...

    That being said, the JBG cradle isn't like the regular KCNC one. It offers full lower rail support. It looks exactly like the MCFK cradle. I've never heard of anyone having any issues with that one. I've been using a MCFK seatpost myself for 5 years.
    +1, MCFK seatpost (and saddle) for several seasons. I can't confirm for certain the JBG approach is exactly the same, but certainly the MCFK has been solid.

  19. #19
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    Some pics the final aluminum version produced by frm:
    https://www.mtbcult.it/tecnica/reggi...pico-frm-obi1/

  20. #20
    Ole
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    Quote Originally Posted by Machianera View Post
    Some pics the final aluminum version produced by frm:
    https://www.mtbcult.it/tecnica/reggi...pico-frm-obi1/
    If only the JBG-2 had the same cable junction on the post itself. Not a fan of the limp penis look.

    But also, the thin alloy saddle cradle of the FRM is not good.
    Last edited by Ole; 03-03-2018 at 11:18 PM.

  21. #21
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    ^^ok, I lol'd.

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