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Compact Crank Compatibility Questions
I'm recovering from a hip replacement, and am considering changing to a
compact crankset to achieve some lower gearing on my Waterford. My current set-up is a Dura-Ace 9-speed group, with a Truvativ Roleur GXP carbon crankset (Gigapipe BB) and a SRAM chain. I'm looking to get another carbon crank, and the one's that keep popping up are the Truvativ and FSA brands (in a reasonable price range). Any issues with compatibility that I need to be aware of? Will my DA front derailleur handle the compact crank? Any suggestions for carbon compact cranksets that you're sure WILL or WILL NOT work would be appreciated ... it'll just make my search easier. Thanks! |
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#2
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Compact Crank Compatibility Questions
In article ,
"tlarwa" wrote: I'm recovering from a hip replacement, and am considering changing to a compact crankset to achieve some lower gearing on my Waterford. My current set-up is a Dura-Ace 9-speed group, with a Truvativ Roleur GXP carbon crankset (Gigapipe BB) and a SRAM chain. I'm looking to get another carbon crank, and the one's that keep popping up are the Truvativ and FSA brands (in a reasonable price range). Any issues with compatibility that I need to be aware of? Will my DA front derailleur handle the compact crank? Any suggestions for carbon compact cranksets that you're sure WILL or WILL NOT work would be appreciated ... it'll just make my search easier. Thanks! This may help: I have a Truvativ Rouleur GXP carbon compact crank on my cyclocross bike. Using a Shimano 9 drivetrain (Tiagra shifter up front? It was what I had in The Pile) it works acceptably well, though I'd recommend a chain watcher. If it was me, I'd just use your current front derailer. If it's too crappy, then Shimano makes a compact-specific fder. -- Ryan Cousineau http://www.wiredcola.com/ "In other newsgroups, they killfile trolls." "In rec.bicycles.racing, we coach them." |
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Compact Crank Compatibility Questions
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#5
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Compact Crank Compatibility Questions
In article ,
says... Thanks for the replies. One question, did you have to adjust the position of the front derailleur downward on the seat tube? I had heard this might be necessary, but mine is a braze-on, so I wouldn't be able to. "RS" wrote in message ... In article , says... I'm recovering from a hip replacement, and am considering changing to a compact crankset to achieve some lower gearing on my Waterford. My current set-up is a Dura-Ace 9-speed group, with a Truvativ Roleur GXP carbon crankset (Gigapipe BB) and a SRAM chain. I'm looking to get another carbon crank, and the one's that keep popping up are the Truvativ and FSA brands (in a reasonable price range). Any issues with compatibility that I need to be aware of? Will my DA front derailleur handle the compact crank? Any suggestions for carbon compact cranksets that you're sure WILL or WILL NOT work would be appreciated ... it'll just make my search easier. Thanks! I use DA7700 shifters and a DA7700 front derailleur with an FSA Energy ISIS compact crank, the crank is not carbon (it was cheap on ebay, I went for it, it works fine). I'm using a pretty wide range cassette in the rear 11-28 and rarely have problems shifting the front. It does have to be adjusted correctly. I had tried the FSA compact specific front derailleur on essentially the same setup on another bike, same exact crank except Shimano BB type. The derailleur worked no better than the standard DA front derailleur. You should be fine. There is some play minimal play allowable up or down, even with a braze-on. You'll have to lower it, try to get it 2mm-3mm above the large sprocket. You may have to experiment with the vertical distance a bit, as I recall I tried a very close tolerance at first but found it shifted better leaving a bit more space. I do have a clamp-on so it was possible to get more vertical movement. |
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Compact Crank Compatibility Questions
tlarwa wrote:
Thanks for the replies. One question, did you have to adjust the position of the front derailleur downward on the seat tube? I had heard this might be necessary, but mine is a braze-on, so I wouldn't be able to. You should adjust the position of the front derailleur downward, so that it is as close as can be to the big ring. It shifts better that way. And yes you can adjust the derailleur height with a braze-on mount. That bolt hole is slotted. -- David L. Johnson It is probable that television drama of high caliber and produced by first-rate artists will materially raise the level of dramatic taste in the nation. -- David Sarnoff, 1939 |
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Compact Crank Compatibility Questions
On Sun, 03 Aug 2008 21:26:41 -0400, "David L. Johnson"
wrote: tlarwa wrote: Thanks for the replies. One question, did you have to adjust the position of the front derailleur downward on the seat tube? I had heard this might be necessary, but mine is a braze-on, so I wouldn't be able to. You should adjust the position of the front derailleur downward, so that it is as close as can be to the big ring. It shifts better that way. And yes you can adjust the derailleur height with a braze-on mount. That bolt hole is slotted. I'm not so sure. If the braze- on is designed for 53/39, and riveted to the frame, it seems intuitive that the derailleur can't be mounted low enough to achieve the "recommended" clearance on a 50 tooth ring. This may or may not affect optimum shifting. My frame has a clamp on, and when I switched to compact, the derailleur was mounted significantly lower than when used for a 53 in order to work properly. |
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Compact Crank Compatibility Questions
On Tue, 05 Aug 2008 22:11:39 -0400, Doug Taylor
wrote: On Sun, 03 Aug 2008 21:26:41 -0400, "David L. Johnson" wrote: tlarwa wrote: Thanks for the replies. One question, did you have to adjust the position of the front derailleur downward on the seat tube? I had heard this might be necessary, but mine is a braze-on, so I wouldn't be able to. You should adjust the position of the front derailleur downward, so that it is as close as can be to the big ring. It shifts better that way. And yes you can adjust the derailleur height with a braze-on mount. That bolt hole is slotted. I'm not so sure. If the braze- on is designed for 53/39, and riveted to the frame, it seems intuitive that the derailleur can't be mounted low enough to achieve the "recommended" clearance on a 50 tooth ring. This may or may not affect optimum shifting. You've intuited it, and Johnson has reported (I believe) his experience. Which should we follow? I used a 50 tooth front chainring on a traditional racing bike with a braze on and it worked fine for me. I just lowered the front derailleur a bit within the braze on. Most or perhaps all front derailleur braze ons allow some vertical adjustment. |
#9
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Compact Crank Compatibility Questions
On Aug 3, 8:02*am, "tlarwa" wrote:
I'm recovering from a hip replacement, and am considering changing to a compact crankset to achieve some lower gearing on my Waterford. *My current set-up is a Dura-Ace 9-speed group, with a Truvativ Roleur GXP carbon crankset (Gigapipe BB) and a SRAM chain. *I'm looking to get another carbon crank, and the one's that keep popping up are the Truvativ and FSA brands (in a reasonable price range). *Any issues with compatibility that I need to be aware of? *Will my DA front derailleur handle the compact crank? *Any suggestions for carbon compact cranksets that you're sure WILL or WILL NOT work would be appreciated ... it'll just make my search easier. Thanks! Compact is a plug and play option. Lower your FD, perhaps take a link out of your chain. In my experience, Truvativ(Sram) and FSA don't have the best bearings and chainrings tho. I think a R600/700 shimano or Campag compact would be a better choice. Both would work fine with your setup. |
#10
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Compact Crank Compatibility Questions
On Aug 3, 9:29*am, Ryan Cousineau wrote:
In article , *"tlarwa" wrote: I'm recovering from a hip replacement, and am considering changing to a compact crankset to achieve some lower gearing on my Waterford. *My current set-up is a Dura-Ace 9-speed group, with a Truvativ Roleur GXP carbon crankset (Gigapipe BB) and a SRAM chain. *I'm looking to get another carbon crank, and the one's that keep popping up are the Truvativ and FSA brands (in a reasonable price range). *Any issues with compatibility that I need to be aware of? *Will my DA front derailleur handle the compact crank? *Any suggestions for carbon compact cranksets that you're sure WILL or WILL NOT work would be appreciated ... it'll just make my search easier. Thanks! This may help: I have a Truvativ Rouleur GXP carbon compact crank on my cyclocross bike. Using a Shimano 9 drivetrain (Tiagra shifter up front? It was what I had in The Pile) it works acceptably well, though I'd recommend a chain watcher. If it was me, I'd just use your current front derailer. If it's too crappy, then Shimano makes a compact-specific fder. -- Ryan Cousineau / "In other newsgroups, they killfile trolls." "In rec.bicycles.racing, we coach them." Actually, shimano doesn't make a compact FD. When some shimano setups started coming on Treks, they used a 50/36 combo, now a 50/34 combo but shimano never had a compact specific FD, don't need one, BTW. |
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