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Derailleur Capacity



 
 
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  #1  
Old April 2nd 05, 07:24 PM
John Everett
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Default Derailleur Capacity

My girlfriend and I just returned from a cycling trip (from Illinois)
to Utah, where other than a short local ride, she put the first
serious mileage on her new Trek 1500 WSD.

Her first complaint, she wanted a lower gear for the hills. According
to the Trek website (the bike is at her house) it comes with 52/42/30
rings and a 12-26 cassette. The shifters and derailleurs are 105.
Since of course we didn't get any of the Shimano Service Instructions
with the bike, can anyone supply the capacity specs for this
combination? And further, does anyone know the real limits, since this
seems to always exceed Shimano's specs. ;-)


jeverett3ATearthlinkDOTnet http://home.earthlink.net/~jeverett3
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  #2  
Old April 2nd 05, 08:27 PM
Pete Biggs
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John Everett wrote:
My girlfriend and I just returned from a cycling trip (from Illinois)
to Utah, where other than a short local ride, she put the first
serious mileage on her new Trek 1500 WSD.

Her first complaint, she wanted a lower gear for the hills. According
to the Trek website (the bike is at her house) it comes with 52/42/30
rings and a 12-26 cassette. The shifters and derailleurs are 105.
Since of course we didn't get any of the Shimano Service Instructions
with the bike, can anyone supply the capacity specs for this
combination?


Front der: 22T
Rear der total capacity: 37T, max sprocket: 27T

The crank can take an inner ring down to 24T and a middle down to 38T.
Something like 50/39/26 would make a nice difference, then the cassette
could be changed as well if yet lower gears were still needed.

And further, does anyone know the real limits, since this
seems to always exceed Shimano's specs. ;-)


Good question -- which I'll leave to the Shimano users (I now use
Campagnolo, and have pushed their capacities by a few teeth). It will
help to keep the chain as short as possible for the big-big and to avoid
the small-small combinations.

~PB


  #3  
Old April 3rd 05, 03:21 PM
Qui si parla Campagnolo
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John Everett wrote:
My girlfriend and I just returned from a cycling trip (from Illinois)
to Utah, where other than a short local ride, she put the first
serious mileage on her new Trek 1500 WSD.

Her first complaint, she wanted a lower gear for the hills. According
to the Trek website (the bike is at her house) it comes with 52/42/30
rings and a 12-26 cassette. The shifters and derailleurs are 105.
Since of course we didn't get any of the Shimano Service Instructions
with the bike, can anyone supply the capacity specs for this
combination? And further, does anyone know the real limits, since this
seems to always exceed Shimano's specs. ;-)


jeverett3ATearthlinkDOTnet http://home.earthlink.net/~jeverett3


You can use a 30t biggest cog w/o changing the rear der. If you do, you
need a longer cage rear der since the 'road' triple rear ders have
pretty short cages and you need someplace to put the extra chain.
  #4  
Old April 3rd 05, 03:23 PM
Qui si parla Campagnolo
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Pete Biggs wrote:
John Everett wrote:

My girlfriend and I just returned from a cycling trip (from Illinois)
to Utah, where other than a short local ride, she put the first
serious mileage on her new Trek 1500 WSD.

Her first complaint, she wanted a lower gear for the hills. According
to the Trek website (the bike is at her house) it comes with 52/42/30
rings and a 12-26 cassette. The shifters and derailleurs are 105.
Since of course we didn't get any of the Shimano Service Instructions
with the bike, can anyone supply the capacity specs for this
combination?



Front der: 22T
Rear der total capacity: 37T, max sprocket: 27T


MaX Sprocket is '27t' since that's the largest road cog they make. 30t
w/o problem in experience.

Campagnolo says 29t as well altho I have used a 11-34, long cage der,
shimano MTB cog/wheel w/o problem.
 




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