Triple to double
08-13-11, 03:55 PM
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Triple to double
My bike has an ultegra 6700 setup with a triple crank. I thought I would need a triple living in the mountains but I don't like it anymore. I want to get a compact double ultegra. So My question is what can I get away with not replacing. I know I should technically get a new brifter, front derailleur, rear derailleur, and new chain. Could I just limit the front derailleur and shorten the chain and still have good performance from the drive train?
08-13-11, 04:37 PM
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Hi, you definitely don't need a new front shifter. A triple front derailleur *should* work fine w/ a compact IF you can lower it enough to be close to the large ring on the compact.
You won't need to shorten the chain, it will work fine(tou new gear choices will be a subset of the old triple set up).
JimPz
You won't need to shorten the chain, it will work fine(tou new gear choices will be a subset of the old triple set up).
JimPz
08-13-11, 04:47 PM
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Set up your triple front shifter and fd limit screws so the two chainrings of the double use the "outer" clicks and, if you forget and shift into the now-missing granny, all you get is a slack shift cable.
Your front derailleur should be fine as Shimano never made a compact-specific fd. Your rear derailleur, within reason, doesn't know or care what's happening in front as long as you don't wildly exceed its wrap capacity.
So, install the new crank, adjust the fd's limit screws and reset your shifter positions and you should be good to go.
Your front derailleur should be fine as Shimano never made a compact-specific fd. Your rear derailleur, within reason, doesn't know or care what's happening in front as long as you don't wildly exceed its wrap capacity.
So, install the new crank, adjust the fd's limit screws and reset your shifter positions and you should be good to go.
08-13-11, 05:00 PM
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+1 to the few parts needed answer. You probably will want to lower the FD to be closer to the chainrings but that's about it. Don't cut the chain until you know exactly what gearing you'll be staying with long term, and maybe not even then.
BTW- you may not even need a new crankset. The BCD of the cranks you have now may accommodate chainrings in the sizes you're looking to use.
BTW- you may not even need a new crankset. The BCD of the cranks you have now may accommodate chainrings in the sizes you're looking to use.
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An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
08-13-11, 05:15 PM
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08-13-11, 05:29 PM
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If you need a smaller inner, and can live with a fairly small outer (I prefer to keep the step within 12t max, though you can go a bit wider (most compacts are 34/50) You use the inner and middle position for, something like a 28/42 combination.
BTW- in case you haven't figured it yet, don't buy a new compact double if you want an inner smaller than 34t.
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An ounce of diagnosis is worth a pound of cure.
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FB
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An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
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