FS SS w/EBB passes first test- Mtbr.com
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  1. #1
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    FS SS w/EBB passes first test

    Take an original GT i-drive, remove the dog bone connector and voila! you have a FS bike with an EBB. Replace the bolt in the i-drive that held the dog bone, thread a cable around it, and then lock the EBB in place. A more sophisticated lock is planned, but I wanted to ride now.

    I was using a singleator and had to account for chain stay growth when the i-drive kicked in. Now I have a constant chain line and a ride without the jarring of a hardtail.
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  2. #2
    theHeadlessThompsonGunner
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    Now that's wacky, and demonstrable of a higher-than-average use of mechanical creativity. Good thinking, brutha.
    "I've courted brain damage like some courtesan of darkness."


    -The Good Doctor

  3. #3
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    So if I understand it correctly you are basically creating a low-pivot URT. I've talked to Vulture before about building a replacement rear-end for my RM pipeline with an EBB since it's a URT design. If I ever break the rear-end on it I might just go ahead and have him build one for kicks.

    I guess you could easily have a machine shop build an eccentric, that would lock in like a bushnell..

  4. #4
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    How's it ride?

    I've been thinking about building a URT singlespeed but wasn't sure how it would ride. How does the bike do standing and climbing? Downhill and standing? Any bob?

  5. #5
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    Feels good

    Quote Originally Posted by UnoPete
    I've been thinking about building a URT singlespeed but wasn't sure how it would ride. How does the bike do standing and climbing? Downhill and standing? Any bob?
    Standing and climbing I don't feel bobbing, but everyone's style of mashing is different. The biggest change from my previous HT steel convert is the confidence it's not going to flex so on the steeps I worry about what I can do, not the bike. Downhill and standing is no problem even with decent hits - actually I need a new front shock more than anything.

    For bobbing problems I'd look at SPV shocks. I've demoed new SPV bikes and find that SPV works, so when it's time to replace things ....

  6. #6
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    I think that platform/SPV valved shocks might mean that the URT comes out of retirement for XC use. I've certainly been thinking of messing about with a URT hardtail (but I liked them the first time around anyhow).

  7. #7
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    Update on the linkage

    After enough rides the chain length is zeroed in. So now the linkage is a little cleaner. Grab the link bar with an open chain link add a wire clamp for adjustablity and voila. The tension on the chain can be tweaked by turning nuts on the wire rope clamp. I added a spring through the other access port to provide back tension.
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  8. #8
    Evil Lurks
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    Pacman -

    I wanted to check in on this thing:

    1) Have you had any pivot problems with the main pivot due to removing the dogbone? I assume the dogbone provides an element of lateral stability, and removing it puts more stress on the main pivot.
    2) Any problems with stress on the aluminum where you've locked the eccentric in place? That's not really a load-baring location by design - crack it yet?

    I'm intrigued by this idea, and willing to give it a shot if yours hasn't folded yet.

    let me know man, thanks,

    Davetoo

  9. #9
    Out spokin'
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    ?

    Quote Originally Posted by [email protected]
    I think that platform/SPV valved shocks might mean that the URT comes out of retirement for XC use. I've certainly been thinking of messing about with a URT hardtail (but I liked them the first time around anyhow).
    "...thinking of messing about with a URT hardtail..."

    Brutha Brant... what am I missing... aren't all hardtails URTs?

    I'm so confused!

    --Sparty
    disciplesofdirt.org

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    We get old because we quit riding.

  10. #10
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    Ss-urt

    Must of missed this whole discussion back when it started. Anyways, here's my contribution to absurd sillyness:
    <img src="https://gallery.mtbr.com/data/mtbr/502/234259bowti_SS.jpg">
    I've used a Pauls disc hub (+ disc adapter) without the indexed washers, so you have around 2mm of chain tension adjustment. That and a close ratio (32:18) lets me run it without a chain tensioner. Works great until you stand up to sprint, then it takes some getting use to. But it still makes a good FS-SS!

    Cheers,

    Tom

  11. #11
    mtbr member
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    Still going

    No problem with the dogbone removal, it doesn't provide lateral stability since it slides
    (L<->R) on a smooth bolt.

    No cracks in the aluminum. It's very strong, I was able to bend the chain link open through hard cranking but the Al is still OK. I replaced the link with an even strong link and drilled and tapped two set screws that will hold in case the link fails.

  12. #12
    6x7=Dont Panic!
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    That thing is hot! I would probably replace the alps 5 with something a bit better, but its still a hot bike.
    Herro prease

  13. #13
    Evil Lurks
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    OK, explain this - what is the spring doing on the rear opening to the eccentric? You mentioned some back tension earlier - but if the whole concept is to hold the eccentric in place then what use does the spring serve?

    Also, where did you drill the support screws - into the frame?

    I could see how an aluminum chain link would serve better than alloy, etc. What do you have in there now which is stronger?

    EBB URT FS SS - enough letters to make a workable acronym or a really odd singlespeed.

    Thanks, Pacman.

  14. #14
    Recovering couch patato
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    Quote Originally Posted by [email protected]
    I think that platform/SPV valved shocks might mean that the URT comes out of retirement for XC use. I've certainly been thinking of messing about with a URT hardtail (but I liked them the first time around anyhow).
    A guy I know did it, a SPV 3-way shock totally transferred his VooDoo Canzo Ti URT. It now climbs! I still have a Canzo myself, but I don't feel the same vibe for it anymore since I went 29". Must say the bike really flew on bumby straights under pedaling, steep climbs and existing sharp turns was the main problem.
    Klok - XC - Skate - Ski

  15. #15
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    Quote Originally Posted by Davetoo
    OK, explain this - what is the spring doing on the rear opening to the eccentric? You mentioned some back tension earlier - but if the whole concept is to hold the eccentric in place then what use does the spring serve?
    The link resisted the EBB turning in only one direction. When not pedaling, the EBB could rotate freely in the opposite direction creating slack 'n slap - not a good thing. Finally drilling set screws allowed the spring to be removed. I could rely entirely on the set screws (completing the evolution of the design) but for now I'll just let all the parts share the load.

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