4 1/2" link to compensate for 4" fork angle- Mtbr.com
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  1. #1
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    4 1/2" link to compensate for 4" fork angle

    Okay, I hear if I put my F100X on an 18.5" NRS frame, it'll make it steer even slower.
    But what if I put the aftermarket 4 1/2" travel rocker arms on? Will it not only give me more travel, a slightly higher bb and quicker steering since the rear will be moved up and steepen the front?

    Please let me know if I'm about to get in a big setup issue.
    Thanks.

  2. #2
    Wandervans
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    try inverting your stem when you put the 100mm on

    putting the 4.5 in the back will raise your bottom bracket height more and give you a higher center of gravity. I think with the inverted stem you will not notice much difference.
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  3. #3
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    dan,
    the giant frame geometry is built around an 80mm fork and when you add a 100 and above you raise the front of the bike resulting in a slacker head angle. i have a 2003 nrs-2 and the first that i added was my trusty marzocchi mx-pro. it did slow the bike down and i did notice a lower bb, I purchased an SDG rocker kit from duckman and it was easy to replace. the ride is a bit taller of course, and the steering is quicker. hope it helps. i will have picture and measuremnt of before and after install, unless Duckman beats me to it..

    dirt diggler

  4. #4

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    New question here. SDG Rocker Arms

    I've seen many people recommending the 4.5" SDG Rocker arms. Does this change the "action" of the NRS system or the anti-bob ? What about warranty ? Would I have to change the rear SID as well ?

    Imagine, an all-mountain NRS still retaining the anti-bob action. Sounds too good to be true ?

    Daniel

  5. #5
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    Hello all,
    It was nice enough in Ohio to wrench on my 03 NRS2. My bike has the 03 marzocchi mx-pro w/eta 100mm fork in front. I purchase the SGF rocker link used through Duckman who had an extra one. Pretty easy to install except keep an eye out for the aluminum rear spacers.
    Bike feels more active and plusher. I added 10psi more. Still no bob on climbing and acceleration. i now have the best of both worlds..

    dirt diggler

  6. #6
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    one thing to add is that the rocker increases the demand on the shock. i weigh in at 170 and just a cross country rider, no big hits here.

    dirt diggler

  7. #7
    I love Pisgah
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    Agree. Upon for first ride thru techy stuff going up or down, the bike immediately feels way more plusher and active, as you stated.

  8. #8
    I love Pisgah
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    Nope, its true. I ran a Fox Vanilla R fork set at 4.6" with them,and loved it. Just too much a weight weenie I guess. Heres the bike with an 02 100mm Marathon airfork(3lbs 5oz on my scale). 4.5" rockers at the Pinhoti trail in NW Ga. Zero bob, as I still run it with zero sag. But, the shock is much more responsive, and is obvious the first ride that the bike feels like it rolls over anything..at least compared to the stock setup.

    <img src="http://www.fototime.com/ftweb/bin/ft.dll/standard?pictid={25DE7313-A52A-4BD5-8971-1F35DF97852A}">

    Bad things..

    A bit heavier(2 oz.)
    1/4" less standover
    Wheelbase is longer by a fraction(1/4" maybe?)
    More wear on the shock since it requires around 10-15psi more for a given rider(but Sids are used all the time with other bikes with 4-5"+ of travel, so no biggie)
    Some find that the RD cable may need lengthening
    Might void the frame warrenty...if you tell them(ssssshhhh...James may be lurking)
    Last edited by Duckman; 03-04-2004 at 04:19 PM.

  9. #9

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    Frame Geometry

    DirtDiggler (& Co.),

    Thanks for your responses, wow !!! I love this forum. Nice bike dirtdig... Anyways, I was already on the lookout for a 105mm Marathon SL, Talas or even an older X-Fly or something similar. I was posting for responses last week and got some good oil.

    I think (IMHO) that a 4.5" NRS would give the Epic a run for it's money in the 24hr stakes. Thanks again guys.



    Daniel S

    p.s. If you know anyone off-loading a nice 100mm air fork with lockout, you know where to find me.

  10. #10
    mtbr remember
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    Anybody now where I might be able to check out these 4.5in rocker arms? Very interesting- I just wonder how long the sidxc shock would last though?

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