Hi
Need some advice, had a 10 speed dura ace 7800 groupset for quite a while, with a standard crank 53/36.
my cassette and chain need replacing, been running with a 11-25 so up to 23 usable while on the big sprocket.
i want to make my life a bit easier and get an ultegra 12-30 cassette and chain, the only thing is 7800 rear is meant to support up to 27T cassette.
so, does that mean i would also need to get a 10 ultegra rear mechanism for this to work? 6700 supports up to 30T cassette.
would my 7800 front mechanism work ok with such setup?
thank you for your feedback
DA 7800 rear mechanism + 30T cassette?
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Re: DA 7800 rear mechanism + 30T cassette?
Postby Duck! » Thu Apr 14, 2016 8:41 am
You will indeed need to replace your derailleur with a newer Ultegra or 105 model (but must be 10-sp, the 11-sp. models are not compatible with older shifters) in order to fit a larger cassette, the 7800 simply does not have the jockey wheel clearance to go bigger than 27T.
Your chainrings will be 39/53, 7800 Dura-Ace was never offered with smaller than 39T.
Your front derailleur will be fine with the larger cassette & 105/Ultegra derailleur.
Your chainrings will be 39/53, 7800 Dura-Ace was never offered with smaller than 39T.
Your front derailleur will be fine with the larger cassette & 105/Ultegra derailleur.
I had a thought, but it got run over as it crossed my mind.
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Re: DA 7800 rear mechanism + 30T cassette?
Postby Blakeylonger » Fri Apr 15, 2016 9:33 am
I ran a 30t on my 6600rd and a 48/34 with no problems and no extreme b screw antics. Your individual situation may vary and a 6700a might be needed.
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Re: DA 7800 rear mechanism + 30T cassette?
Postby polishbiker » Sun Apr 17, 2016 10:43 am
Thank you for the input
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Re: DA 7800 rear mechanism + 30T cassette?
Postby Duck! » Sun Apr 17, 2016 7:31 pm
Dura-Ace typically has much finer tolerances than the lower groups. I have never met a 7800 that will happily accept larger than its factory-stated maximum 27T sprocket (but will reluctantly accept 28T), but cheaper models can have the boundaries pushed a bit.
I had a thought, but it got run over as it crossed my mind.
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