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Can I use 11 speed Front Derailleur on 10 Speed bike

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Can I use 11 speed Front Derailleur on 10 Speed bike

Old 09-28-17, 06:53 PM
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rogerbrener
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Can I use 11 speed Front Derailleur on 10 Speed bike

Hope someone can Help. I'm swapping all my 10 speed Ultegra Parts over to my new 2018 sirrus carbon but I need to buy a Braze on front derailleur since my clamp on won't work on this frame. My Question is I would like to use the Shimano FD 6800 Braze On 11 speed front Derailleur with the longer arm on my 10 speed set up. Will it work with my 10 speed chain and my Shimano SL-R780 Flat Bar 2X10 Shifters. Or should I Just get the 10 speed FD 6700 Braze on Front Derailleur. Thank You Roger Vista, Ca
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Old 09-28-17, 07:40 PM
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get a 10s one
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Old 09-29-17, 12:29 AM
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They are not compatible
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Old 09-29-17, 09:44 AM
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Originally Posted by redlude97 View Post
They are not compatible
Can you expound on why they are not compatible (e.g., the arm on the 6700 is shorter/longer than the 6800 and thus the cable pull is different). Otherwise you sound just like the manufacture (Shimano) saying not compatible and you need to buy a whole new group. Explaining why its not compatible would educate people on what to look for.
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Old 09-29-17, 10:16 AM
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Originally Posted by Eggman84 View Post
Can you expound on why they are not compatible (e.g., the arm on the 6700 is shorter/longer than the 6800 and thus the cable pull is different). Otherwise you sound just like the manufacture (Shimano) saying not compatible and you need to buy a whole new group. Explaining why its not compatible would educate people on what to look for.
The arm on the 6800 fd is significantly longer and the cable pull on the 6800 shifter is larger. 10s shifters won't shift between the rings
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Old 09-29-17, 11:42 AM
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Originally Posted by redlude97 View Post
The arm on the 6800 fd is significantly longer and the cable pull on the 6800 shifter is larger. 10s shifters won't shift between the rings
Thank you for the excellent explanation. It is aggravating when Shimano (as well as Campy) makes these type of changes for no real apparent reason (as least to the average user) that makes things incompatible. Oh well. I guess tech has to advance.
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Old 09-29-17, 11:46 AM
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Originally Posted by Eggman84 View Post
Thank you for the excellent explanation. It is aggravating when Shimano (as well as Campy) makes these type of changes for no real apparent reason (as least to the average user) that makes things incompatible. Oh well. I guess tech has to advance.
the shifting is way better, the lever force required with the 5700/6700/7900 with the under cable routing was pretty significant.
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Old 09-29-17, 11:57 AM
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Makes sense. From what I understand you are saying, when Shimano went to the hidden (under bar tape) shifter cable routing, it increased the force required to shift the FD as compared to the older exposed routing. So the change in the 6800 series was to "correct" that (i.e., improve the shifting). As with all new tech, there are sometimes unintended consequences. The individual has the choose of embracing or ignoring the new tech. Just sometimes its not obvious what you are signing up for with the new tech.
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Old 09-30-17, 02:17 PM
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the cable pull length was increased for two reasons... less effort, AND increased precision of shifts. ANY slop in the older pull ratio/higher gear count sytems became immediately apparent via noise and false shifts... the longer pull increases the width of the "sweet spot" when shifts are actuated.

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Old 09-30-17, 03:12 PM
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Originally Posted by maddog34 View Post
the cable pull length was increased for two reasons... less effort, AND increased precision of shifts. ANY slop in the older pull ratio/higher gear count sytems became immediately apparent via noise and false shifts... the longer pull increases the width of the "sweet spot" when shifts are actuated.
But that was really only necessary for the rear cassette. Front shifting precision isn't any more critical with the move from 10 to 11 speeds. And I don't really buy the force argument either as that is determined by the users hand location relative to the pivot of the lever and the various springs in the system most notably the FD return spring.
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