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trail bike shock tune....

Discussion in 'Downhill & Freeride' started by saruti, Nov 1, 2012.

  1. saruti

    saruti Turbo Monkey

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    Sorry for this unrelated question
    But in other forums people don’t really know about these things.
    I ride an iron horse MKIII for the last 6 years for AM rides
    I want to buy a new trail frame/bike. And was thinking about the giant trance x .
    The maestro link is a lot like the DW link so I figured it will need a low compression tune.
    Am I right?
    I rode a friend trance x bike yesterday. He swapped the original rear shock to a kashima shock with M tune. And doesn’t remember what tune the original shock had…
    It felt good. But I think it will feel even better with a low tune.
    What do you think?
    The leverage ratio of the trance x is progressive.

    thanks guys trancex.jpg 20121031_150050.jpg
     
    #1 -   Nov 1, 2012

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  2. 6thElement

    6thElement Schrodinger's Immigrant

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    I thought the Trance was 5" with a 1.75" stroke, so how can it have > 2.86 leverage ratio?
     
    #2 -   Nov 1, 2012
  3. saruti

    saruti Turbo Monkey

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    what do you mean?
    why cant it be?

    thanks.
     
    #3 -   Nov 1, 2012
  4. CBJ

    CBJ Turbo Monkey

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    #4 -   Nov 1, 2012
  5. Jim Mac

    Jim Mac MAKE ENDURO GREAT AGAIN

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    #5 -   Nov 1, 2012
  6. CBJ

    CBJ Turbo Monkey

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    Or just get a long john

     
    #6 -   Nov 1, 2012
  7. -BB-

    -BB- I broke all the rules, but somehow still became mo

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    He is saying that bc 5/1.75 is 2.857.... So if it were linear it would have a 2.857 LR. It isn't linear so the ratio curve can be above and below 2.857, but it has to average out to that number. From the graph you posted it appears that the curve is way over 2.857 for the majority of the travel and then just a tiny bit below for the end stroke. So the average is probably well above 2.857 across the curve. I thik that is what is causing him to question. I'm no shock expert, but it makes me question as well.
     
    #7 -   Nov 1, 2012
  8. Steve M

    Steve M Turbo Monkey

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    The Linkage files for a lot of short link bikes like that are not that accurate (and in some cases, neither are manufacturer stated numbers for travel), so don't rely too much on the numbers you find in there unless you've measured stuff up for yourself. The files you find in there are usually handy for getting a vague idea of what a bike's characteristics are like, but trying to actually numerically derive useful information from them is no use whatsoever unless the input geometry is accurate. The shorter the links, the less accurate the Linkage files usually are (for example, the Sunday ones are way out of whack with reality). Measure the bike up yourself, put the points into the Linkage file and then have another look. A good indicator of accuracy is usually whether the shock length comes out close to its stated size (or approx 2mm shorter if it's a Fox air shock).
     
    #8 -   Nov 1, 2012
  9. Udi

    Udi RM Chief Ornithologist: “I Brake for Birds”

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    -BB- is correct, however the discrepancy lies in one of two factors:

    1) Manufacturer has declared the actual travel value falsely. Probably not the case here, but it has happened in the past.

    2) Linkage graph is inaccurate. Most bikes are generated by mapping points on a photograph of a frame, which is particularly inaccurate for bikes with short links, like the Trance. You can increase accuracy greatly by measuring a frame in some sort of jig, but that doesn't apply to the majority of bikes in the Linkage library. It's worth noting that this isn't a fault of the program, rather "garbage in, garbage out".
     
    #9 -   Nov 1, 2012
  10. saruti

    saruti Turbo Monkey

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    OK....
    so I need a low or medium tune? :)
     
  11. boogenman

    boogenman Turbo Monkey

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    you need to cut bacl on the green bicycle parts