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Will Shimano compact cranks (FC-R700) fit Dura-Ace 7800 BB



 
 
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  #1  
Old April 26th 06, 09:52 PM posted to rec.bicycles.tech
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Default Will Shimano compact cranks (FC-R700) fit Dura-Ace 7800 BB

Or any other compact cranks for that matter? I'd like to infrequently
swap out Dura-Ace double cranks for a compact. I'd prefer not to have
to swap the BB as well if there are compact cranks out there that will
fit it.

Thanks.
-B.

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  #2  
Old April 27th 06, 02:06 PM posted to rec.bicycles.tech
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Default Will Shimano compact cranks (FC-R700) fit Dura-Ace 7800 BB


Brad Ford wrote:
Or any other compact cranks for that matter? I'd like to infrequently
swap out Dura-Ace double cranks for a compact. I'd prefer not to have
to swap the BB as well if there are compact cranks out there that will
fit it.

Thanks.
-B.


Same BB for all road shimano outboard bearing BBs....Same cups for the
MTB ones as well...just a different center plastic thingy...

  #3  
Old April 27th 06, 02:07 PM posted to rec.bicycles.tech
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Default Will Shimano compact cranks (FC-R700) fit Dura-Ace 7800 BB


Brad Ford wrote:
Or any other compact cranks for that matter? I'd like to infrequently
swap out Dura-Ace double cranks for a compact. I'd prefer not to have
to swap the BB as well if there are compact cranks out there that will
fit it.

Thanks.
-B.


Just a side note...with a compact-50-34, and a 11-23 cogsest, you will
have a higher high gear and a lower low gear than a 12-25 and a
53/39....

  #4  
Old April 27th 06, 04:40 PM posted to rec.bicycles.tech
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Default Will Shimano compact cranks (FC-R700) fit Dura-Ace 7800 BB

Qui si parla Campagnolo wrote:
Brad Ford wrote:
Or any other compact cranks for that matter? I'd like to infrequently
swap out Dura-Ace double cranks for a compact. I'd prefer not to have
to swap the BB as well if there are compact cranks out there that will
fit it.

Thanks.
-B.


Just a side note...with a compact-50-34, and a 11-23 cogsest, you will
have a higher high gear and a lower low gear than a 12-25 and a
53/39....


But not a much lower gear, and that is my big beef against the current
fad of 110mm bcd cranksets. Instead of wasting lots of money on new
cranksets and usually new bottom brackets, just put the next size up
cassette on the bike. With the currently sold bike parts, the only way
to get low gears with a double crankset is to get the compact crankset
AND a bigger cassette. Bigger meaning bigger cogs in back. Lot of
money.

Assume Campagnolo 10 speed cassettes since I'm familiar with Campagnolo
cassettes, not those other brands.

50-34 11-23 has 120" high, 39" low.
50-34 12-25 has 110" high, 36" low.
50-34 13-26 has 102" high, 35" low.
50-34 13-29 has 102" high, 31" low.

53-39 11-23 has 128" high, 45" low.
53-39 12-25 has 117" high, 41" low.
53-39 13-26 has 108" high, 40" low.
53-39 13-29 has 108" high, 36" low.

Starting with a normal 53-39 crankset, changing the cassette from 11-23
to 12-25 gets you about the same as changing the crankset to 50-34.
Easier and cheaper to change the cassette.

Or changing from a 12-25 cassette on a 53-39 to a 13-29 cassette gets
you the same as changing the crankset to 50-34. Easier and cheaper to
change the cassette.

The only way to get fairly low gears, not as low as a triple crankset,
is to change the cassette to a 13-29 AND change the crankset to 50-34.
Probably easier and cheaper and much more effective to just get a
triple crankset and have even lower gears than is possible with a
compact crankset.

 




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