Eccentric Bottom Bracket adjustment strategy EBB- Mtbr.com
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  1. #1
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    Eccentric Bottom Bracket adjustment strategy EBB

    I am wondering how people deal with the changes in saddle and handlebar position when adjusting EBB. It didn't seem to matter much when I was doing fewer miles...I would just adjust the seat height up or down... but now I going on a long trip where saddle position and handlebar reach will be nice to have consistent.

    I am riding a Van Dessel Ramble Tamble with a Sram 8spd chain ... with a half-link to boot.

  2. #2
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    How much adjusting are you doing with your BB? I set mine and forget about it til my chain is a bit loose, but then it is just a slight move.
    My motorcycle runs on infant blood

  3. #3
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    Quote Originally Posted by vtdavey
    I am wondering how people deal with the changes in saddle and handlebar position when adjusting EBB. It didn't seem to matter much when I was doing fewer miles...I would just adjust the seat height up or down... but now I going on a long trip where saddle position and handlebar reach will be nice to have consistent.

    I am riding a Van Dessel Ramble Tamble with a Sram 8spd chain ... with a half-link to boot.
    The BB throw never bothers me, but I always keep mine in the lower half of the shell.

    I think one reason it's easy for me to ignore is that I have a 36" inseam. The longer one's legs, the less noticeable the BB movement because the saddle is so far from the BB.

    But sometimes a person might have to adjust seats & bars. Good luck.

    --Sparty
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  4. #4
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    It does not bother me for some reason......... I am the opposite of the poster above me... I try and keep mine in the top position to improve pedal to ground clearance........

    I don't mess with it a whole bunch though since I finally found the gearing I like.....

  5. #5
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    Interesting... my inseam is 30.5" so it makes sense that a 1/2 inch of movement is more noticeable. The EBB never really bothered me before either but now I am running the chain through a full life span: un-stretched new to beat loose. The first break-in period is the biggest adjustment - then just smaller moves. I need the 1/2 link just to get the chain within the adjustment range of the EBB. I am riding loooong rides where bike position is critical. Knee Over Pedal sweetspot, bars close to knees climbing, seat height just right - almost more like a road bike than a SS. Keeping the BB in one half of the EBB or the other makes sense. I think I can make it work but still debating whether to race the EBB in the Tour Divide or not...

    thanks for your input,
    DaveT.

  6. #6
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    It seems odd that you need to add a half link just to take up slack as the chain wears, if I'm reading you correctly.

    I will run my EBB from about 8 o'clock to 4 o'clock without changing my saddle. KOP isn't much of an issue for me because I am standing often.
    I look at my EBB as the fulcrum of a lever, and the length really doesn't change, just the angle, which doesn't seem to have any negative effects on me.

    Yeah, I know this wasn't too helpful, but good luck anyways.

  7. #7
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    Quote Originally Posted by HOLLYWOOD33
    ......... I am the opposite of the poster above me... I try and keep mine in the top position to improve pedal to ground clearance........
    .....
    One of the advantages of a custom frame is you get to tell your builder to put the bottom bracket as far from the ground as you like, which on my SS is about 14". I run 195mm cranks.

    So even though my eccentric is in the lower half of the shell, my pedals are probably still farther from the ground than most.

    --Sparty
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  8. #8
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    With a new chain I need the 1/2 link to get the crank to land in the middle of the EBB adjustment range. Without it the chain is either too loose or too tight. I start at 6 o'clock and I am now at 8 o'clock... at 9 o'clock I will need to move my bars away from my knees. I was thinking I would take the half link out. I am wondering what other people do. Run the chain from 3 to 9 o'clock or replace it within a certain range. On my longer ride I will have less opportunity to replace the chain and the handlebar to knee distance could become a problem.

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