Risky1
new member
Reged: 01/02/04
Posts: 3
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Have a 54cm. dragonfly. Does anyone have any experience with compact cranksets with this size frame? Have 53 tooth big ring right now and the front derailer band is as low as it can go on the water bottle boss. Wondering if going to a 50 tooth on a compact would make too big of a gap and result in poor shifting.
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Dave_Thompson
prophet
Reged: 12/19/03
Posts: 717
Loc: Spokane, Washington
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I think Craig Calfee would be the person that could best answer your question: craig@calfeedesign.com
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Steel lover, but then I like Ti with carbon too.
Licensed bike geek.
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dah
new member
Reged: 01/09/04
Posts: 19
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I have a 54cm custom and it was a definite problem with the 50 chainring. It would barely and only very slowly shift to the large ring in certain combinations.
I (very carefully) cut away about 3 mm of the lower water bottle boss to fix it, but that sort of thing isn't covered under warranty so I wouldn't recommend it.
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garygromet
friend
Reged: 01/28/04
Posts: 36
Loc: Miami, FL, USA
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FSA makes a 50T 130BCD chainring.
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Max
journeyman
Reged: 12/18/03
Posts: 69
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What does BCD stand for?
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MAX
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kio
new member
Reged: 01/23/04
Posts: 5
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Bolt circle diameter...
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Max
journeyman
Reged: 12/18/03
Posts: 69
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Thanks.
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MAX
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dave_donielson
friend
Reged: 02/03/04
Posts: 32
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How do you like the compact crankset ? I seems it might be a good alternative to a triple if you use a 10sp DA with a 12-25 or 12-27 cassette.
Dave
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Lon
sage
Reged: 12/20/03
Posts: 595
Loc: Pittsburgh, PA
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It depends on how low you want your gearing. It worked for Tyler just fine. The small ring is a 34 so no matter what your low gear is it will not be as low as a triple with a 30. I live in Western PA and we are in the Allegheny Mountains. Many of our roads are paved over wagon trails that were Indian Trails so percentages can get high on climbs. I always appreciate my 30 then. Last year I rode in Indiana where the hills "rolled" and I never left my middle ring and averaged about 1 to 2 mph faster on a 100 degree day for 100 miles.
On the high side there is no problem. The big ring of a compact with an 11 cog is actually higher than a 53 x 12. You can compare all the ratios and get a good idea at: http://www.sheldonbrown.com/gears/
My winter bike that I ride in Pittsburgh mostly, where I'm either going up or down, so consequently close ratios are not a big deal is a D/A double with a XTR rear derailleur. So my low gear is a 39 x 34 which is about the same ratio as a 30 x 27. My high gear is a 53 x 11 which is actually higher than my triple which is a 53 x 12. Again since I'm either going straight up or down or on some kind of slope it works out great. I would not want this to ride across the state however. I would prefer my D/A Triple. The ratios are better for all around riding. It is more versatile.
Now I'm 215 (13-14% body fat not bad for an ice cream lover), 56 years old, with a bad knee. If you are young, light and have good knees the compact would probably be all you need.
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dave_donielson
friend
Reged: 02/03/04
Posts: 32
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I found on the FSA website a listing of the gear raios. A compact 50-34 with a 12-27 will give you about the same runout as a 30-25. It will save some weight over a triple but I might miss the extra gears. I'll let you know.
Dave
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