Bike Build Check + Derailluer Question (top normal?)
12-14-07, 11:46 AM
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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!
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 11:54 AM.
12-14-07, 12:02 PM
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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 12:07 PM.
12-14-07, 12:08 PM
#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?
Can you explain how this derailleur has a stated capacity of 45T but doesn't appear to have a long cage?
12-14-07, 12:20 PM
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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?
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.
12-14-07, 01:33 PM
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Last line in features part of description says photo is of GS type (not the SGS)
12-14-07, 01:41 PM
#7
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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.
12-14-07, 02:15 PM
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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 02:22 PM.
12-14-07, 02:28 PM
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Sheldon "Downshifts Are More Critical" Brown
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12-14-07, 04:12 PM
#10
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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.
Some people say "top gear", some say "high gear"
