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Shimano's latest Dura-Ace group is a big step forwards in some ways, but not in others(Image credit: James Huang)
The new STI Dual Control levers offer a drastically different shape from Dura-Ace 7800(Image credit: James Huang)
Last year's dip in the top of the lever has been replaced by a flatter and wider perch(Image credit: James Huang)
The new carbon brake lever is canted outwards a few degrees for an easier reach from the hoods(Image credit: James Huang)
Shimano use an annoying cover plate that must be removed in order to adjust reach or replace the brake cable(Image credit: James Huang)
Shortening the reach leaves an unsightly gap – an oversight atypical of Shimano(Image credit: James Huang)
Derailleur housing now runs beneath the handlebar tape and can be run either in front or behind the bar(Image credit: James Huang)
Running the derailleur housing in front leaves a sharp edge at the rear of the lever though(Image credit: James Huang)
The shifter internals are dangerously exposed to the elements(Image credit: James Huang)
The new Flight Deck computer is far easier to install – just remove the top of the shifter and bolt on the new bits(Image credit: James Huang)
The new crankset is undoubtedly one of the stars of the group and is now offered in a compact version as well(Image credit: James Huang)
The deep-profile spider arms and incredibly expensive outer chainring yield superb front shifting performance(Image credit: James Huang)
The heavily relieved spider keeps the weight down(Image credit: James Huang)
Shimano retain last year's arm attachment method(Image credit: James Huang)
The revised front derailleur cage is wider than before yet shifts superbly and also runs rub-free in the large chainring with no need for trim(Image credit: James Huang)
Revised front derailleur pivot geometry requires more cable pull at the lever but yields a lighter feel that requires less effort(Image credit: James Huang)
Rear shifts are as impeccably smooth and precise as before(Image credit: James Huang)
The carbon fibre pulley cage is curiously flexy but this doesn't seem to affect shift performance(Image credit: James Huang)
Braking is superb with the new calipers and revised cable pull ratio(Image credit: James Huang)
Aggressive yet careful machining sheds weight while retaining stiffness. Low-profile barrel adjusters yield smoother routing for reduced friction(Image credit: James Huang)
Shimano probably could have made the new calipers lighter but we wouldn't trade their superb stopping power and fingertip modulation to save a few grams(Image credit: James Huang)
The asymmetrical chain is exceptionally quiet and shifts just as smoothly up front as out back in either direction(Image credit: James Huang)
Cassettes have only been mildly revised and drop a few grams while seemingly losing none of their shift performance(Image credit: James Huang)
Shimano has greatly expanded the range of available ratios to appeal to a wider audience(Image credit: James Huang)
Shimano say their latest
Shimano’s head-to-toe overhaul of its premier Dura-Ace road group has
Ergonomics – flatter and
Shimano have moved the shifter internals back into the base of the lever to
The new lever feels more substantial, with a significant increase in
The concealed cables may yield a cleaner look but some riders will
The shape changes will undoubtedly polarise opinion but a few details
The adjustable reach feature is nice to have but doing so
Shifting performance – good
We had grand expectations for 7900 after countless hours on Shimano’s
Instead, 7900 can only downshift two gears per sweep instead of
In contrast, Dura-Ace 7800 requires a 20-degree throw for both upshifts
Despite the concealed housing’s additional bend, cable friction is only
However, front shifts are flat-out amazing and without doubt the best
Interestingly, Shimano have done the same thing that many riders criticised
Cable friction remains more of an issue for rear shifting over the long
Replacing derailleur cables is just as easy as before – though the
Braking performance – best
7900’s braking performance is definitely superior to 7800 with a
The pad contact point is positive, the power comes on in a highly
These new stoppers perform at their best when run fast and hard. We quickly found ourselves braking later and
Also worth mentioning are the slick low-profile barrel adjusters. They’re bigger and easier to use while on the
Drivetrain – whisper quiet,
Though the crank arms are dramatically different from a finish
The cassette also hasn’t changed much, gaining an extra titanium cog in
The new asymmetric chain is superb, though, running whisper-quiet –
As promised, shift performance has degraded little over our six-month
Compatibility
Shimano say the revised cable pull ratios on 7900 essentially make
Mixing brake components yields either a too-firm lever with reduced
The situation with the front derailleur is an entirely different beast,
Worthy of an upgrade?
Shimano Dura-Ace 7900 offers a variety of notable improvements over
However, Dura-Ace 7900 also carries with it a hefty price hike (about
If you’re considering a new bike that comes equipped with Dura-Ace
