Question about Shimano Dura Ace Front Derailleur Fd 7800

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What height above chainring should front derailleur be set too when switching from a compact to a standard chainset (dura-ace).

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Generally 2 to 3mm

Posted on May 26, 2009

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Dura Ace di2 front derailleur 10 speed (7970) not shifting correctly. Moving back and forth with clicking sound. How do we fix?


First, is cable tight, it may be that the cable has loosened or stretched. In this case, Put chain on inside spocket, loosen hex head bolt, pull tight, retighten hex head.
It also could be the limit screws have vibrated loose. There are two of them on the top of the derailleur. Make small adjustments in one screw, check to see if it improves shifting or makes it worse. You didn't say whether it was the small or larger spocket. The limit screws control how far in or out the derailleur moves. Read more on Shelton brown .com under derailleur heading

Sep 16, 2014 | Shimano Dura-Ace Di2 7970 Front Derailleur...

2 Answers

The front derailer on my sram red compact just wont change quick!


Which brand of shifters are you using? A SRAM derailleur won't work with Shimano shifters and vice-versa.

So - first; if you are using SRAM shifters with the Red derailleur - then changing to Shimano will not solve your issue but only make it worse.

If however you have Shimano shifters - then this is a good solution.
The Red derailleur should not shift that poorly with SRAM shifters. It is not the best - but it's not bad. If I had the bike in a repair stand I would be looking carefully at the following after affirming that the shifting system was indeed all SRAM:


  • Derailleur cage height relative to the large chanring - should be a maximum of 2 mm
  • Derailleur cage should be aligned as close to parallel to the rings as possible
  • Derailleur upper and lower limit screws should be adjusted within spec and in order to allow the derailleur to travel the correct amount for ideal shifting
  • Derailleur cable tension should be correct.


Hope this helps... Let me know if you need more.

Oct 28, 2012 | Sram Red

1 Answer

3rd Di2 install and first 2 worked perfectly. On this bike when on big ring big cassette (23) get pretty good chain rub on front derailuer. Have tried setting tail of derailuer in more than usual and...


Derailleurs are mass-produced and are essentially identical to each other, so unless damaged it's unlikely to be the derailleur. A sticky cable could keep the derailleur from trimming properly. It also can lead you to think it's tight enough when it is not. Otherwise it's hard to diagnose remotely. Derailleur must be both at proper angle and height to shift well, cable both move freely and be at proper "tension."
Di2 Shimano Electronic Intelligent System Installation

Apr 15, 2017 | Shimano Dura-Ace 7900 Di2

1 Answer

How do you fit a sram chainset and bottom basket to a boardman full carbon fibre road bike


Bottom basket?

The chain goes on the chainrings, through the derailleurs and over the rear cassette cogs.

Look around here...

http://www.parktool.com/blog/repair-help/categories/bottom-brackets

May 16, 2011 | Cycling

1 Answer

Hi i have a 7800 dura ace groupset and i want to put a smaller chainring on the crankset to ride in the alps will my front mech still be ok to shift from a 34 teeth up to the 52 ok ....dave


That's only two teeth different than the compact cranks that are out there now. I have a 50x34 on one bike and it shifts fine. You have to be careful to use combo's that dont drop too much chain slack for the rear derailleur to take up. I never cross more than one gear past the center on my 9-speed. I don't know why I waited so long to go with compact. I love it.

You may find that your crank won't take a 34 unless you already have 110mm bolt pattern instead of 130mm. 39 teeth is usually the lower limit for 1340mm. Look around on eBay for a specific ring that works for you.

http://en.wikipedia.org/wiki/Crankset

May 03, 2011 | Shimano Dura Ace Front Derailleur Fd 7800

1 Answer

I have an Ultegra RD6600 and CS5600 (12/25T) on my new Look bike. I'd like to put a CS6700 11/28T on it for better gearing for the steep climbs around here. Apparently the CS6700 11/28T required the...


Derailleurs -

The RD6600 will only handle a 27T gear so no to 11/28.
The RD6700 will handle the 28T gear so yes to 11/28

Shiftlever -

The ST6600 will work fine with the RD6700.
The ST7900 should only be used with other 7900 products (Dura-ace for Dura-ace) it will work but not as nice.

There is no need to change your shiftlevers.

The ST7900 is almost fully compatible, in that any Shimano Derailleur will work with any Shimano Shift lever, However the ST7900 has a slightly different shifting pattern and the shift levers should only be used with other 7900 products to get the best performance.

Side note - If you are using standard cranks now, you could keep your shifting in tact and change your cranks to compacts and get lower gear ratios than moving to the 28T for a similar price to Rear derailleur/ cassette and chain plus labor. This is a common change in my shop.

Apr 07, 2011 | Shimano Ultegra CS-6700

1 Answer

Campagnolo Record 10 sp. short cage rear drlr.+ 13-26 cassette


You don't say if this happens in the BIG ring, small ring or both. If it's just the big ring I'd suspect there isn't enough chain length.

Cross chaining is unnecessary and bad for your drivetrain. I never go more than one cog past the center of my cassette opposite the chainring I use.

http://www.parktool.com/repair/readhowto.asp?id=26

May 02, 2010 | Campagnolo Record 10 Rear Derailleur

1 Answer

Require assembly schematic for shimano dura ace shifter . left shifter lever failed, will not activate the front derailler, disassembled, found nothing broken, require advice regarding proper reassembly...


log onto Shimano.com, it is probably the limit screws (the two screws that limit travel) or you have a faulty ratchet in the lever, try the shimano website anyway they have great tutorial and manual support

Nov 14, 2009 | Shimano Dura Ace Front Derailleur Fd 7800

1 Answer

Chain rubs inner front derailleur while in lowest gear.


on front derailleurs there should be two small cross head screws one has L(lower) next to it the other has H(higher), you will need a cross head srewdriver, you simply losten or tighten the 2 screws and it will adjust the position of the derailleur to your crankset and it that completely fails then you might need to try a different crankset

Feb 26, 2009 | Sram Cycling

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