Is a DuraAce 7800 front derailleur compatible with DuraAce Di2 7900?
11-29-11, 01:47 PM
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Is a DuraAce 7800 front derailleur compatible with DuraAce Di2 7900?
I'm thinking of swapping out my aluminum 7900 front for the cooler looking carbon 7800.
Wondering why they don't make a 7900 carbon front?
Wondering why they don't make a 7900 carbon front?
11-29-11, 02:34 PM
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The Di2 shifters and derailleurs have to work together. You can't swap in a mechanical 7900 or 7800 front derailleur.
11-29-11, 03:33 PM
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Sorry, I was mistaken. I meant the DuraAce 7800 carbon crankset:
https://weightweenies.starbike.com/fo...c.php?p=554894
Will this work with my Di2 7900? Sorry for the confusion! I'm such a mechanical doofus.
https://weightweenies.starbike.com/fo...c.php?p=554894
Will this work with my Di2 7900? Sorry for the confusion! I'm such a mechanical doofus.
11-29-11, 05:42 PM
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Sorry, I was mistaken. I meant the DuraAce 7800 carbon crankset:
https://weightweenies.starbike.com/fo...c.php?p=554894
Will this work with my Di2 7900? Sorry for the confusion! I'm such a mechanical doofus.
https://weightweenies.starbike.com/fo...c.php?p=554894
Will this work with my Di2 7900? Sorry for the confusion! I'm such a mechanical doofus.
11-29-11, 06:15 PM
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What if the OP used the carbon 7800 crank with the existing 7900 chainrings?
11-30-11, 12:32 AM
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The shaping of the outer 7900 ring would look pretty stupid on any other crankset. The 7800 carbon crank and stock rings should work OK with electronic shifting - many people have successfully used non-7900 cranks with the electronic setup without problems. Having everything be 7900 might give the best results, but using other stuff should still be more than acceptable.
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