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  1. #1
    Hack Racer
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    educate me about this old syncro crank

    How come it only has 3 arms for the 5 arm spider? How do you mount a chain ring to it ? Was this crank any good?
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  2. #2
    Certified Bike Junkie
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    Interesting, I didn't know those came in octalink.
    Need: McMahon brake for roller cam mounts, Mountain Goat fork.

  3. #3
    Hack Racer
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    Good eye. I didn't pay attension to count the slots, I thought it was ISIS originally. Any idea how chain rings are fitted to those cranks?

  4. #4
    Carsten
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    would have to see the backside. either those are prototypes that were made useless or they require a partial spider. the logo tells that those are not overly old and probably not made in canada but taiwan.

    carsten

  5. #5
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    the “STD” Forged Plate is missing. thats why they went so cheap on ebay. that plate is bolted to the crank and holds the 2 missing bolts to fix the chainring. its the same as on the syncros forged aluminium cranks. i attached the pdf to give you an impression of whats missing.
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  6. #6
    Hack Racer
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    There is a guy unloading a lot of NOS syncros stuff on ebay.

    http://search.ebay.com/search/search...=32%26fsoo%3D2

  7. #7
    Hack Racer
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    Quote Originally Posted by Inigo Montoya
    the “STD” Forged Plate is missing. thats why they went so cheap on ebay. that plate is bolted to the crank and holds the 2 missing bolts to fix the chainring. its the same as on the syncros forged aluminium cranks. i attached the pdf to give you an impression of whats missing.
    Thanks for the PDF.

    A four letter word now clouds my mind.

  8. #8
    mtbr member
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    asdf?

  9. #9
    mtbr member
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    ask the seller about that part. he might not know it belongs to the cranks.

  10. #10
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    Yeah, I think it was akin to the Bullseye Gen 1 spider.

    Why oh why Syncros, why? Was it the infamous breaking forged cranks that did them in? They were doing just fine with the Revolutions and then they go and...

    ...another sad story in the annals of MTB.
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  11. #11
    VRC Illuminati
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    Those forged Syncros cranks came with a partial spider to complete the circle, which apparently these are missing. He doesn't make that too clear in the auction.

    Should look like this:



    -eric-

    http://www.rumpfy.com

    Wanted: Syncros 27.2 x 425 seatpost, 26.8 x 400 IRD seatpost

  12. #12
    Visitor
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    I don't get it.

  13. #13
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    Quote Originally Posted by Inigo Montoya
    ask the seller about that part. he might not know it belongs to the cranks.

    i think the seller does given the statement about "NO ADDITIONAL HARDWARE OR PARTS INCLUDED". Better to say that then "MISSING IMPORTANT CHAINRING BRACKET PART" ... LOL
    Complete my:
    Klein Attitude XS collection: 91, 92

  14. #14
    All Lefty's, all the time Moderator
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    With all due respect, that has to be one of the dumber ideas I've ever seen. Anyone know the thought process behind these? Just curious. All I see is a fantastic opportunity for potential irritation
    This is a Pugs not some carbon wannabee pretzel wagon!!

    - FrostyStruthers



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  15. #15
    Visitor
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    Has anybody seen the other part of my crank? I can't find it anywhere.

  16. #16
    Neo-Retro Forever
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    It had something to do with the net-forging process...I don;t remember the details.

    Pippin Osborne was a pretty cool guy to talk to back on the day. Hi explained that crank to me at a trade show once, but it was too long ago to remember. Something to do with alignment of the grain in the forging process, and the fact that the cranks needed very little machining after the forging.

    I'm sure there are engineers in the world who could explain it better...

  17. #17
    All Lefty's, all the time Moderator
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    Quote Originally Posted by richieb
    the fact that the cranks needed very little machining after the forging.
    I remember hearing about that too. I still can't wrap my head around it though. I wonder if near net forging is somehow different than the cold forging that say, Shimano does. Or if it's a design difference, that uses the standard process
    This is a Pugs not some carbon wannabee pretzel wagon!!

    - FrostyStruthers



    www.mendoncyclesmith.com

  18. #18
    artistic...
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    Quote Originally Posted by MendonCycleSmith
    With all due respect, that has to be one of the dumber ideas I've ever seen. Anyone know the thought process behind these? Just curious. All I see is a fantastic opportunity for potential irritation
    nevermind.
    want: Ibis ti handlebar. suntour 31.8 front derr. bottom pull

  19. #19
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    nevermind.
    Me too! +1

  20. #20
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    I remember the marketing/magazine hype as when you hit a rock or log this part would break as opposed to the cranks spider breaking. Therefore all you had to do is buy that piece instead of a new crankset. Yes, of course this makes no sense because the chainring is most likely to bend first. Probably why noone else tried it.

  21. #21
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    I think that by having the "force transfer device" (that's what Syncros called it, if I recall correctly), it made the shape of the crank much easier to cold forge. There was also some discussion on the elimination of stress risers, if I am not mistaken? Don't have the details, I'm afraid.

    I've had my cranks for 10 years now, and seems to have held up reasonably well.

  22. #22
    mtbr member
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    near -net, weak link, hype:

    C'mon everyone, truth be told, if those eebaay cranks were complete, we would have scoffed them all up!

  23. #23
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    I loved those Revos

    Quote Originally Posted by hairstream
    Yeah, I think it was akin to the Bullseye Gen 1 spider.

    Why oh why Syncros, why? Was it the infamous breaking forged cranks that did them in? They were doing just fine with the Revolutions and then they go and...

    ...another sad story in the annals of MTB.
    until the arm snapped at the pedal thread housing and took a chunk out of my leg

  24. #24
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    Ouch! That hurts... your leg, not my pride. Pics?

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