Question about Shimano Dura Ace Front Derailleur Fd 7800

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Can 7800 shifter use with 7900 front derailuer

Can 7800 shifter be use with 7900 front derailuer

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  • viboracobra4 May 02, 2010

    the question is: will a 7800 shifter work with a front 7900 dereailluer? these parts are dura ace shimano brand. they are different year model.



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Any derailluer can be used for the front and the rear should match how many gears it will choose.

Posted on Apr 30, 2010

  • Ed Paje May 02, 2010

    The front derailleur (7900) has to index 3 chain rings provided by the SL7800 shifter lever. Yes it should work, both derailleur and shifter have a very simple design of pull and spring retraction. Check Shimano's website.



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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

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18 gears on bike, 1-6 ok hi to low faulty ie 2,.3 ok is get down to 1 witch is the lowest will not go all the time

Gday thisis usually an easy fix.

firstly i would clean and lubricate the derailuers (sounds like the front one is the problem) then once its clean and moving freely set the rear derailuer into gear 3 or 4 and the fromt derailuer into the middle cog (ie the chain should be on those cogs) then adjust your cable to remove slacknes but not so tight as to move the derailuers. Hopefully this will solve your problem
Good Luck.
**** Woodman

Aug 05, 2011 | Cycling

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

Dura ace brifters very sticky

You can squirt them with a spray lubricant (bicycle lubricant) to free them up if it is just a dirt issue, you need to pull the brake lever to expose the internal gearing mechanism, don't take anything apart.

If your shifter part is sticky, this usually clears things up. If it does not make trace through the derailleur cable and make sure it's not the cable hanging up instead of your shifter. Replace the cable and housing as necessary.

If its the brake lever, smae check of the cable system but also check the brake itself. The lever will feel sticky when there is a snag in the cable or if the brake is no longer returning with the same spring tension.

After that you can have them rebuilt or replaced. Depends on which model you have 8, 9, 10 (7800, 7900) as too the exact recommendation.

Dec 30, 2010 | Shimano Cycling

1 Answer

Height of front derailuer and set up

It sounds like something amiss in the shifter. Start here and look around. It may get you to a solution.

May 08, 2010 | Shimano Deore LX Mountain Bike Front...

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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, 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

2 Answers

Shimano st 7900 shifter,left lever apart and how to reassemble

You can download an exploded diagram of the 7900 series STI shifters here:

You can reassemble them according to this diagram.

May 11, 2009 | Shimano 2008 Dura-Ace BR7800 Rear Road...

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Nvidia geo force failure

The best place to purchase the Nvidia GeForce Go 7800 for a Dell Inspiron 9400/E1705 laptop is eBay. If available on eBay, the price could range from $230-$300 and search for "Dell 9400 video" or the card name. Some eBay sellers will give you a $50 or so credit, if you purchase a card from them. The video card can be downgraded (ATI Mobility Radeon® X1400 HyperMemory)
or upgraded (NVIDIA GeForce Go 7900 GS or GTX). Also, you can try, but they're typically more expensive and reliable.

Yes, the video card can be repaired in most cases. Search eBay for Nvidia GeForce Go 7800 repairs.

Mar 27, 2009 | Dell nVIDIA GeForce Go 7800 GTX, (256 MB)...

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