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Rim & Drum vs Spur Sprocket

Discussion in 'Chainsaw' started by mjdtexan, Oct 31, 2008.

  1. mjdtexan

    mjdtexan ArboristSite Lurker

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    Why is the rim and drum system better than the spur sprocket? Or is it?
     
  2. icelation8

    icelation8 ArboristSite Member

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    That way when the sproket wears out you just replace the rim instead of having to replace the entire clutch drum.
     
  3. scotclayshooter

    scotclayshooter Addicted to ArboristSite

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    A rim is cheaper to replace.
    The all out race guys seem to prefer spurs I gather they can be lightened and are more efficient
     
  4. SawTroll

    SawTroll Information Collector

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    Much easier to change gearing for different conditions as well.....:clap: :clap:
     
  5. funky sawman

    funky sawman Addicted to ArboristSite

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    There is one place for spur sprockets: in the GARBAGE:chainsaw:
     
  6. Crofter

    Crofter Addicted to ArboristSite

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    Havent heard of that! Do you have any info on it as I have heard the efficiencies of even a roller nose over the common toothed spur roller nose tip.
     
  7. Jonny Quest

    Jonny Quest ArboristSite Operative

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    Spur Sprockets =

    Consumer.

    Rim Sprockets are usually found on "pro" saws. There is a reason for this.

    I like the rim sprocket because it is very easy to change out (and cheaper). Oregon recommends that you change out rim/spur every 2 chains. Its $5 for a new rim compared to $15 for a new spur & drum.

    If you do change over, some saws require a new oil pump drive gear. Bailey's has these and they are only a few buck$.

    JQ
     
  8. Urbicide

    Urbicide Addicted to ArboristSite

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    I may be mistaken, but it seems to me that most saws running 3/8ths low-pro chain come equiped with spur sprockets. My MS-200T has one, as well as my old Poulan 1800 top handle.
     
  9. stihl86

    stihl86 ArboristSite Operative

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    Some make it sound that the drums last forever. They wear just like anything else. When they get thin and weak enough, they explode, along with the clutch taking the chainbrake and oil pump.
     
  10. idahohay

    idahohay ArboristSite Lurker

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    The only saw I ever owned that had a spur sprocket was an 045 in about 1980. When you throw a chain with one of these, quite a few drivers will often get dinged and wont fit back in the bar unless you file them flat. It was changed out and I never had the problem again.
     
  11. scotclayshooter

    scotclayshooter Addicted to ArboristSite

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    Here goes 2 hous on the search function again lol

    Took 30 seconds!!!!

    http://www.arboristsite.com/showthread.php?t=62315&highlight=race spur sprocket

    This is here i got the info lodged in my brain if its wrong blame Huskydave:)
     
    Last edited: Nov 1, 2008
  12. kstill361

    kstill361 ArboristSite Operative

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    another small advantage,unlike the spur, when the rim get a little wear it still floats. Wear a grove in your spur, chain no longer floats .
     

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