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  1. #1
    two wheeled accomplice
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    Bike Build Check + Derailluer Question (top normal?)

    I am building a touring bike that will be used primarily on road but have the capability to handle some offroading. Can anyone tell me if there are conflicts with my desired setup?

    Frame: Surly LHT
    Fork: Surly LHT
    Headset: Cane Creek S-3 (1 1/8”) or Chris King NoThreadSet
    Build/Spokes: DT Swiss or Wheelsmith w/ brass nipples
    Tires: Specalized Nimbus Armadillos
    Rims: Velocity Cliffhanger 36 Hole

    Rear Hub: Shimano Deore LX FH-M580 36 Hole
    Front Hub: Shimano Deore LX HB-M580 36 Hole

    Brake Levers/Shifters: Shimano 105 ST5510
    Front Break: Shimano BR550 or Avid Shorty 6
    Rear Brake: Shimano BR550 Rear or Avid Shorty 6 Rear

    Front Derailleur: Shimano 105 FD-5600 (needs 28.6mm clamp)
    Rear Derailluer: Shimano Deore LX RD-M580-GS or RD-M581-GS

    Crankset: Shimano 105 FC-5600 (50/39)
    Bottom Bracket: Shimano 105 SM-FC5600 English Thread
    Cassette: Shimano Deore LX CS-M580 (11-34)
    Chain: SRAM PC-991

    Seatpost: Unknown
    Bars: Unknown
    Saddle: Unknown
    Stem: Unknown
    Pedals: Unknown
    Panniers: Unknown
    Rack: Unknown

    --

    Which of those two rear derailleurs will work with the STI shifters? Either? If either will work which would be 'better'?

    I did read this which explains the difference but I am still totally lost as to how it affects me.

    Any input at all would be greatly appreciated!
    Last edited by Kazer; 12-14-07 at 10:54 AM.

  2. #2
    biked well well biked's Avatar
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    Either derailleur will work, the cable pull ratio is the same whether top or low normal. It's just a matter of preference. My preference is top normal for road riding. I've used the low normal type, though, and I'm sold on it for XC mountain biking. The relative ease of emergency downshifts is the main advantage of the low normal setup.
    Last edited by well biked; 12-14-07 at 11:07 AM.

  3. #3
    two wheeled accomplice
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    Cool!

    Can you explain how this derailleur has a stated capacity of 45T but doesn't appear to have a long cage?

  4. #4
    two wheeled accomplice
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    Nevermind, it looks like they just have the wrong photo up.

  5. #5
    biked well well biked's Avatar
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    Quote Originally Posted by Kazer View Post
    Cool!

    Can you explain how this derailleur has a stated capacity of 45T but doesn't appear to have a long cage?

    It must be the angle of the photograph. It does have a long cage, or actually, SGS is "super" long cage. GS is long cage.

  6. #6
    Small Member maddmaxx's Avatar
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    Last line in features part of description says photo is of GS type (not the SGS)

  7. #7
    Senior Member
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    The basic affect on you of using a low normal rear derailler would be that the right brake lever on your STI shifters would upshift (go to a smaller cog) instead of downshift (go to a larger cog) and the small paddle behind the brake lever would downshift. I've never used a top normal derailler so I can't comment on the actual performance.

  8. #8
    biked well well biked's Avatar
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    Quote Originally Posted by joejack951 View Post
    I've never used a top normal derailler so I can't comment on the actual performance.
    I think you probably mean you've never used a low normal derailleur, because top normal is the current terminology Shimano uses for conventional rear derailleurs, where without cable tension the derailleur is positioned over the smallest cog because of the derailleur's spring. For awhile, they were using the term "high normal" instead of top normal. To me, the term "high normal" makes more sense, I have no idea why they changed their terminology.
    Last edited by well biked; 12-14-07 at 01:22 PM.

  9. #9
    Gone, but not forgotten Sheldon Brown's Avatar
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    Quote Originally Posted by Kazer View Post
    Rear Derailluer: Shimano Deore LX RD-M580-GS or RD-M581-GS

    Which of those two rear derailleurs will work with the STI shifters? Either? If either will work which would be 'better'?
    Either will work. I prefer the low-normal ("RapidRise") version.

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  10. #10
    Senior Member
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    Quote Originally Posted by well biked View Post
    I think you probably mean you've never used a low normal derailleur, because top normal is the current terminology Shimano uses for conventional rear derailleurs, where without cable tension the derailleur is positioned over the smallest cog because of the derailleur's spring. For awhile, they were using the term "high normal" instead of top normal. To me, the term "high normal" makes more sense, I have no idea why they changed their terminology.
    And you, sir, are correct. I thought I was saying it backwards (which I was) but I was just reading the Shimano page wrong and following what I thought Shimano was saying. I shouldn't post on Friday's. [edit]Upon rereading my post, I had my terminology correct up until my last sentence. Oh well.[edit]

    Some people say "top gear", some say "high gear"

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