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  1. #1
    mtbr member
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    Replacing rear spring

    I've got a Jamis Dakar Sport with the steel coil over shock, and want to upgrade to something lighter. First thought was a titanium spring, but I'm not sure how to interpret the specs.

    The spring is marked 400x1.78. 400 is the spring rate, what's the 1.78? Free length is 3 3/8", and travel is 1 1/4" (measured between the shcok body and the bumper).

    Any suggestions?

    thanks!
    dave

  2. #2
    Former Bike Wrench
    Reputation: mtnbiker72's Avatar
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    the 1.78 is the stroke length of the coil before full compression. It's fairly normal to have a spring that is about .25" longer than the stroke. Your shock has a 1.5" stroke (the space the bumper takes up is part of the stroke). So you'll want a spring that is about 1.75" stroke length.

    Now, let me ask you something....

    The shock on your Dakar Sport is probably a Fox Vanilla with no adjustments. This is a sub $200 shock at best. Does throwing another $200 for a ti spring seem a little excessive?

    For a little more you could get a Fox Float R brand new for $250 and it will be half the weight of your current shock. If you check the MTBR classifieds, you can probably find a lightly used one for less than $150. Seems like the better way to go to me.

  3. #3
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    Thanks for the help! You're right, my budget's more like $50. Saw a bunch of ti springs on ebay for that much too, though didn't know what to get. You've given me some good advice. I'll check the classified too.

    cheers,
    dave

  4. #4
    mtbr member
    Reputation: oldskoolbiker's Avatar
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    Jun 2005
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    Consider these blow out shocks from Santa Cruz.
    http://www.santacruzbicycles.com/cat...fb1ffcbc9d5b05

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