Road Cycling It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle. -- Ernest Hemingway

Triple to Double.

Old 03-09-07, 11:28 AM
  #26  
Chris9
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Yeah looks like I will be sticking with the triple for a while. I would eventually like to get into a 52 or 53 tooth big ring. I guess this will do for now and i'm don't really know the compatability with fsa stuff. Also what difference do you get from a 170mm to 175 mm crank?
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Old 03-09-07, 01:35 PM
  #27  
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Originally Posted by Chris9
Also what difference do you get from a 170mm to 175 mm crank?
Mostly comfort. They put 170mm (or shorter) cranks on small bikes because people who ride small bikes have short legs. Longer cranks for longer legs.

You theoretically could see a small difference in torque because of the longer lever arm, but this difference is probably just absorbed in gearing, body proportion/muscle mass, position, and reduced cadence, etc...here's a humorous collection of crank length misinformation.
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Old 03-09-07, 02:15 PM
  #28  
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Originally Posted by jeffremer
Mostly comfort. They put 170mm (or shorter) cranks on small bikes because people who ride small bikes have short legs. Longer cranks for longer legs.

You theoretically could see a small difference in torque because of the longer lever arm, but this difference is probably just absorbed in gearing, body proportion/muscle mass, position, and reduced cadence, etc...here's a humorous collection of crank length misinformation.
Misinformation #4: Zimmermann: "Cyclists with longer femurs tend to push the saddle back and this too increases the effective crank length--- and given the general correlation between foot and femur lengths, the same crank arm length is effectively longer (at relevant point of force application) for larger cyclists. A longer crank often means pushing the saddle forward, reducing the effective length." I dunno where that "effective length" stuff comes from, but the reason taller riders push the saddle back is because their crank is too short, so the pedal at the mid-downstroke is not far enough forward for them. Once the bike is fitted with the correct length crank, the tall rider will put his saddle back where it belongs because the pedal will be in the right place during the downstroke.

I knew it! Im thinking of trying a 177.5mm or maybe a 180mm crank.
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Old 03-09-07, 07:14 PM
  #29  
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Another thing about going to a double is the narrower tread (q-factor) which _could_ improve comfort or power for some people.

Also, the only thing you _need_ to change to go to a double is the crank.
The BB, shifters, existing chain, and both derailers will work with the new crank.
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