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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! |
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.
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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? |
Nevermind, it looks like they just have the wrong photo up.
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Originally Posted by Kazer
(Post 5808938)
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. |
Last line in features part of description says photo is of GS type (not the SGS)
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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.
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Originally Posted by joejack951
(Post 5809458)
I've never used a top normal derailler so I can't comment on the actual performance.
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Originally Posted by Kazer
(Post 5808777)
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'? Sheldon "Downshifts Are More Critical" Brown Code:
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Originally Posted by well biked
(Post 5809633)
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" :) |
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