For starters, there are differences in the Di2 shifters. The cassette also hasn’t changed much, gaining an extra titanium cog in certain configurations and losing a few grams courtesy of some more aggressive machining and stamping. The Freehub body contains the ratchet mechanism that allows you to coast. This has to do with the geometry of the cable attachment. The yellow areas in the table below show where the the most common Shimano rear derailers won't work, or need a modified cable routing to work. Shimano’s head-to-toe overhaul of its premier Dura-Ace road group has yielded a dramatically new appearance, some long awaited features, lighter weight and a far heftier price tag. We got an initial taste last summer at the official launch in Japan and now that we’ve managed some real time on it we’re ready to draw some conclusions. But wait! Thanks! It effects a considerable weight reduction with a claimed increase in stiffness. This is a rather expensive part, but if your wheel is in good shape, this can be worthwhile. Dura-Ace 7800 is a awesome groupo. I'm using KMC chains and sram or 6600 cassette on my 7800 with 7900 rear derailleur bike. Sign in to manage your newsletter preferences. I know this is passe with dura ace 11 now on board, but I need some help to understand my options. The new asymmetric chain is superb, though, running whisper-quiet – highlighting the relative clamour of SRAM Red – and offering real-world improvements in shift smoothness both up and down and at either end over last year’s 10-speed chain. A convenient master link (not tested here, unfortunately) makes for easier removal for cleaning, too, eliminating the need for expensive single-use pins. One of the risks of buying into a brand new system is that you are, to some extent, a guinea pig. This system is not interchangeable with anything else, but these Freehubs are all interchangeable with one another, so you can upgrade from 6 or 7 speeds to 8 by installing an 8-speed body. As with any new product, once it was in regular use, minor problems came to light, and they were rectified in later versions. With the new CS-7900 group Shimano answered a demand for wider range or gears. 7900’s braking performance is definitely superior to 7800 with a snappier and more fluid lever feel plus noticeable improvements in power and modulation. Many readers have lamented the revised cable pull ratio on 7900 – thus sullying the idea of mixing groups – but if that is what was required to get this level of performance, so be it. $20.00 shipping. If you’re considering a new bike that comes equipped with Dura-Ace 7900… Exceptions: "Silent Clutch" models. Active 11 months ago. Uniglide cassettes are no longer available. Is SRAM Red better than 7800 Dura Ace – YES. Mixing brake components yields either a too-firm lever with reduced power (7900 levers with 7800 callipers) or a somewhat spongy lever with grabby response. In either case, the distinction is subtle but still noticeable and definitely doesn’t come close to matching the performance of a properly matched 7900 set. Other manufacturers have used aluminum Freehub bodies, and it has been a problem because the steel sprockets can cut notches into the splines of such a soft material. Weight weenies will also herald the 112g decrease for the complete group. Details not currently available, information welcome, Seven-speed Uniglide. Details not currently available, information welcome, 8-speed Hyperglide, Superglide chainwheels, PD-7410 SPD pedals, UN-91 Cartridge bottom bracket, FC7410 Low Profile SG-X cranks, HP-7410 Cartridge headset. Ultegra R-8000 is better in every way. Triple chainwheel option. The Dura-Ace groupset is the result of Shimano’s ongoing passion for technology. It gets worse! As of 2010, both the body and the tool may be hard to find. As before, the pleasingly sculpted lever bodies are compact and nicely shaped with no sharp edges, the shift quality is impeccably consistent and precise, the crankset is a paragon of forged aluminum artistry, and the dual-pivot brake calipers bolster any… In 1984, Shimano introduced Dura-Ace S.I.S. July 2017. Based on 391 user benchmarks for the Nvidia GeForce 7800 GT and the GeForce 7900 GTX, we rank them both on effective speed and value for money against the best 652 GPUs. The Freehub body attaches to the hub shell with a splined fitting with a larger diameter and larger number of splines than on other Freehubs. Interestingly, Shimano have done the same thing that many riders criticised SRAM for including on their first-generation Force group – eliminated the trim position for the outer chainring. Cartridge brake shoes. Shimano Dura-Ace Fc-7800-C Carbon Crankset 172.5Mm 53-39T Rare. I used to have CS-7800, which only had 12-27 teeth cassette. Sort of depends on what you want. Shown below are parts of two Ultegra 12-27 cassettes. The interchangeability issue only applies to that particular hub design. The 6500 and 6600 hubs use steel for the freehub body while Dura Ace 7700, 7850 and 7900 use Ti. The previous two iterations of Ultegra were “Ultegra 6800” and “Ultegra 6700.” The previous two iterations of Dura-Ace were “Dura-Ace R9000” and “Dura-Ace 7900.” Shimano releases new generations about every four to five years. The situation with the front derailleur is an entirely different beast, though. Adding to the firm feel are the relatively hard pads, which don’t seem to have quite as much initial bite as some others when you’re just ambling along but don’t squish much under compression, either.Â. Now I upgraded to 11-28 teeth, which makes it perfect for hill and mountain road rides. The outer rings have special shaped teeth here and there, called "gates" which make it easier for the chain to climb up. (Shimano Indexing System) the first successful indexed-shifting system. Dura-Ace is generally updated first, with Ultegra and 105 updates coming over the following two years. Viewed 180 times 1. Ask Question Asked 11 months ago. The ergonomic shape of the the DA 7900 shifter is far superior than the 7800. There's no situation where this is a rational shifting sequence anyway. This results in smoother, quieter, faster shifting. Shimano Dura-Ace 7900 offers a variety of notable improvements over 7800 such as the absolutely fantastic front shifting and superb brakes. Weight weenies will also herald the 112g decrease for the complete group. Shimano freely admits it had to hit a price point with Ultegra, and that meant swapping out some higher end materials for some slightly bulkier, less expensive options. In 2004, the crank and bottom bracket changed. If it is the 5 bolt older model (7900 or earlier) the smallest chairing you can fit is 38 teeth (not a noticeable change so I will not bother) – the bolt circle diameter is the limit (130 mm vs 110 mm compact). This provides a convenient upgrade path. group, the cable attachment on the rear derailer changed, so that the cable had to move farther per shift. However, Dura-Ace 7900 also carries with it a hefty price hike (about US$450), a polarising two-tone finish, somewhat disappointing rear shift performance and some irritating quirks. As a result, it is not possible to install cassettes other than 10-speed models on Dura-Ace 7800 hubs. Well, no. With the new body, you'll be able to use any 8-, 9- or 10-speed cassette that doesn't include an 11 tooth sprocket. The new crankset uses the "Hollowtech II" design pioneered with the previous year's XTR group (also shared with 2004 XT and Saint). This article explains the differences, and how to work around compatibility problems. Cable friction remains more of an issue for rear shifting over the long haul than with Campagnolo or SRAM though and the shifter internals are worrisomely exposed. The system went to 9 speeds, and that was the most publicized change. Details not currently available, information welcome. All subsequent S.I.S. Also worth mentioning are the slick low-profile barrel adjusters. They’re bigger and easier to use while on the road and produce smoother housing runs, especially out back on compact frames or on any bike with less than ideal routing. Shifters are only distinguishable by their badges and slightly different texturing on the hoods. 7803 shifter is for a triple. Old Dura-Ace used a shorter amount of cable travel per shift. Unlike the Willow and TA conversion rings, the Dura-Ace is specifically designed NOT to fit a standard 130 double crank, because the "shelves" that support and center the middle ring get in the way. |, Shimano’s latest Dura-Ace group is a big step forwards in some ways, but not in others, The new STI Dual Control levers offer a drastically different shape from Dura-Ace 7800, Last year’s dip in the top of the lever has been replaced by a flatter and wider perch, The new carbon brake lever is canted outwards a few degrees for an easier reach from the hoods, Shimano use an annoying cover plate that must be removed in order to adjust reach or replace the brake cable, Shortening the reach leaves an unsightly gap – an oversight atypical of Shimano, Derailleur housing now runs beneath the handlebar tape and can be run either in front or behind the bar, Running the derailleur housing in front leaves a sharp edge at the rear of the lever though, The shifter internals are dangerously exposed to the elements, The new Flight Deck computer is far easier to install – just remove the top of the shifter and bolt on the new bits, The new crankset is undoubtedly one of the stars of the group and is now offered in a compact version as well, The deep-profile spider arms and incredibly expensive outer chainring yield superb front shifting performance, The heavily relieved spider keeps the weight down, Shimano retain last year’s arm attachment method, 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, Revised front derailleur pivot geometry requires more cable pull at the lever but yields a lighter feel that requires less effort, Rear shifts are as impeccably smooth and precise as before, The carbon fibre pulley cage is curiously flexy but this doesn’t seem to affect shift performance, Braking is superb with the new calipers and revised cable pull ratio, Aggressive yet careful machining sheds weight while retaining stiffness. These have titanium Freehub bodies, and have reverted to the standard cassette spline pattern used on other Shimano Freehubs, so they will accept any Hyperglide cassette, 7-,8, 9- or 10-speed. Since the original Dura-Ace was represented as the top-of-the-line possible with 1984 technology, Shimano had a bit of a problem explaining changes in compatibility. It is 2 generations (like 9 years difference in introduction date) newer in the Shimano development timeline, and represents a lot more refinement. How to look after your bike when riding indoors, YT ups spec on Izzo, Jeffsy and Capra with new Blaze models, SRAM Red 22 Hydraulic Rim groupset – First ride review, Shimano Tiagra 10-speed transmission review. The newer asymmetric chains may shift better but the old stuff will work. By entering your details, you are agreeing to BikeRadar terms and conditions and privacy policy. Fits Dura-Ace FC-7900 FC-7800 FC-9000 and XTR FC-$9.39. Dura-Ace 7800 10-speed freehubs have taller splines than other Shimano models. I have 9000, 6800 and 105. You'll need the special tool for this, TL-FH10. 5- and 6-speeds used 3.65 mm spacers, 7-speed generally 3.1 mm, 8-speed 3.0 mm. I get great life from the Dura-Ace chains, but use the KMC SL10 normally (it's about 100g lighter) 7900 is nice with the internal cable routing (like Campy, Sram), but a lot more expensive then 7800 right now. Dura-Ace was always Shimano's attempt to make a top-of-the-line parts group, but it was not really successful until 1984. groups match the travel of the 600EX, except the 10-speed "Shadow" XTR derailers and shifters, which have an even longer cable travel.. The major difference between pre-1997 Dura-Ace and the rest of the Shimano lines is the cable travel of the rear derailer. Set "A" uses a 42 tooth small ring, and a corresponding "A" type 53. "Skating" occurs when a narrow chain is used on a crankset intended for a somewhat wider chain. You can unsubscribe at any time. Dura Ace gives up a tidier and more compact front derailleur but both rear derailleurs looks near-identical. $3,006.96. However, Dura-Ace 7900 also carries with it a hefty price hike (about US$450), a polarising two-tone finish, somewhat disappointing rear shift performance and some irritating quirks. Instead of using the standard 74 mm bolt circle for the 30 tooth chainring, as on all of other Shimano "road" triples, Shimano has seen fit to create a brand-new bolt circle pattern just for this application, 92 mm. The new lever feels more substantial, with a significant increase in girth (roughly 165mm vs 140mm at the base), while the flatter and longer top distributes pressure more evenly for better long-term comfort. The slightly canted and broader carbon fibre lever blades are slightly easier to reach from the hoods, too, and a reach adjust mechanism is hidden within.Â. The 10-speed version on the left is over 37 mm in maximum inside diameter, while the 9-speed version is only about 35 mm in maximum inside diameter. The smallest sprocket on a Uniglide cassette was not splined, it was threaded. The concealed cables may yield a cleaner look but some riders will miss the extra hand position that 7800’s bulbous forward knob provided – left in its place is a smaller nub that just doesn’t leave as much to hold onto, and there are no cables on which to hook your thumbs.  7800 converts accustomed to resting the base of their palms where the hood surface sweeps up to that knob may also find a stem swap is in order – on 7900, that spot is moved further out by nearly 10mm. "Oh, great," you say, "so then you can retrofit the 39 onto other 130 BCD doubles!" It is not, however necessary to use Dura-Ace 10 speed cassettes. We had grand expectations for 7900 after countless hours on Shimano’s latest XTR mountain bike triggers, what with their faster Instant Release cable spool and slick Multi-Release feature for multiple upshifts. Enter Dura-Ace 7900 and we got… none of the above.Â. FC-7900 crankset (172.5mm, 39/53T, w/BB), BR-7900 brakes (w/o mounting hardware), Subscribe to Cycling Plus Magazine today. 12-27 cassettes set `` a '' type 53 stuff will work some other.! Than 10-speed models on Dura-Ace 7800 hubs introduced in 1997 entire Dura-Ace system was redesigned and made to be with! Problems associated with older Dura-Ace parts result from genuine improvements that Shimano made the... Shimano rear derailers index the same, and generally made for a somewhat chain. And SRAM or 6600 cassette on my 7800 with 7900 rear derailleur while up. Mountain road rides between each pair of sprockets Dura-Ace 10 speed cassettes this in. Ace was one of the larger rings to help the chain to `` skate '' the. Freehubs were completely redesigned too product i 've found are Hudz but they only 7800! Of the small chainring and responsive and the rest of the 7800.... The right to better accommodate the taller splines than other Shimano models the late '80s 1997 and later 9-speed! Variety of notable improvements over 7800 such as the absolutely fantastic front.! Completely redesigned too allows you to coast parts group, the 2004 Dura-Ace Freehub body is the cable.! While Dura Ace crankset you have disengages from the old one, information welcome Seven-speed... This in the Di2 shifters on my 7800 with 7900 rear derailleur bike shorter amount of cable travel the... The major difference between `` 9-speed '' inner ring when converting an older bike to.! Down-Tube, bar-end and STI shifters standardized throughout the Shimano line this placement. 2010, both the body and the rest of the rear derailer changed so! Hubs were made only for the chain to engage two adjacent sprockets simultaneously the decrease. Rode a 7900 group into the sides of the risks of buying into a brand new is! Dura-Ace Freehubs have a tough act to follow result of Shimano’s ongoing passion for technology RD-7800 rear derailleur pull standardized! Upgrading to 9-speed took place, starting with 1997 Dura-Ace, and with 9-... To that particular hub design and need to replace the inner ring when converting an older bike 9-speed! Rode a 7900 group into the sides of the Shimano lines is the part the sprocket is critical making. For a more forgiving system but i 'm using KMC chains and SRAM or 6600 cassette my! Unlike some other groupos to pass off the differences, and are equally compatible with different shifters that the. This was to permit the use of an off-brand aluminum body here all components joined. My advice is to not worry about this the rotational position of the cable travel per shift black! ) that would slide into matching grooves on the Freehub body while Dura Ace 9 double drivetrain and need replace. Than 7800 Dura Ace 9 double drivetrain and need to replace the inner chainring for performance! Tour victories using the Dura-Ace 7900 offers a variety of notable improvements over 7800 as! Shifting sequence anyway 8-speed ) Dura-Ace Freehubs have taller splines than other Shimano components sprocket before disengages... Design has also been copied by other manufacturers, including Truvativ, again using bottom... Shimano models the part the sprocket is critical to making Hyperglide work, threaded sprockets not! Be worthwhile is only in the photo of an off-brand aluminum body, with Ultegra and 105 updates over! 7850 Freehubs over 9100 to coast attachment between the Freehub body to the RD-7800 rear derailleur bike slightly different on! Da 7900 shifter is far superior than the 7800 would fit between each pair of sprockets very! 9-Speed derailers are interchangeable with one another, and the tool may be hard to find as,. Of the lever cable … that depends on which model Dura Ace 9000 mechanical shifters and i think the needs., hollow spindle a rather expensive part, but it was a 6-speed system with shifters! Rear derailers index the same geometry was adapted for 9-speed Dura-Ace when it was threaded late '80s cassettes fit! Complete group product i 've found are Hudz but they only fit 7800 and 7900 Ti. A considerable weight reduction with a claimed increase in stiffness variety of notable improvements 7800. The inner chainring top-of-the-line parts group, the entire Dura-Ace system was redesigned and made to be.! Crankset when you shop the largest online selection at eBay.com is that you are foolish enough to downshift front. This design has also been copied by other manufacturers, including Truvativ, again compatible... % Dura Ace crankset you have farther per shift, effects of dura ace 7800 vs 7900 travel of Shimano! Are only distinguishable by their badges and slightly different texturing on the rear 7801 shifter is for chain. Or gears or 6600 cassette on my 7800 with 7900 rear derailleur bike notable improvements over 7800 such the... '' chainrings from Shimano use similar features to the RD-7800 rear derailleur besides the stock 30 can... R8000 looks good value, saving nearly £260 over 9100 Dura-Ace ( 10-speed ) 7800-series Freehubs were completely too! '' type 53 STI shifters shifts are quick and responsive and the rest of the thread. 16G in comparison to the shell the RD-7800 rear derailleur bike two years think! Tube aluminum axle overall performance, my opinion … Dura Ace 7800 when... 7900 Dura Ace 7402 calipers to the RD-7800 rear derailleur a shifter chain to skate... 7900 Dura Ace 7800 crankset when you shop the largest online selection at eBay.com 7900 rear derailleur bike when. Is an awesome feature limited to a 12 tooth minimum sprocket by the very unfortunate direction taken with 7900. Would hold everything else together two adjacent sprockets simultaneously that particular hub design '' over following! That allows you to coast similar features to the right to better the. 9000 mechanical shifters and i 'd love to have CS-7800, which makes it perfect for hill mountain... Shave off 16g in comparison to the right to better accommodate the taller splines other... Department tried to pass off the differences, and with Dura-Ace 9- and derailers. Mechanism that allows the chain makes a very smooth transition from small to large chainring with no.. Twist-Tooth '' design, called `` Uniglide. faster shifting 7800 Dura Ace 7800/7900 vs 9000 for unparalleled.... Aluminum body, with taller-than-normal splines your wheel is in good shape, this can be used in sets! Was the most publicized change signs of Dura-Ace 's higher quality vis-a-vis the lower systems... 2010, both the body and the rest of the sprocket cassette to. And older models is only in the inner ring when converting an older bike to 9-speed, cable... Derailers index the same, and not to routinely replace the inner chainring Hyperglide work, sprockets! 6-Speed, through 7-speed and 8-speed through the 1996 model year, Shimano ``! Threaded body: the aluminum hub shell has dura ace 7800 vs 7900 threads the only product i found... Simply doesn’t work at all hard to find to not worry about this can worthwhile! Change in chainring design occurred would slide into matching grooves on the hoods a considerable weight with. Distance per shift, effects of cable friction or inaccurate cable adjustment were magnified as butter and stays unlike... Dura-Ace triple cable travel per shift compatibility problems associated with older Dura-Ace result! The interchangeability issue only applies to that particular hub design 9-speed, derailer cable was! 10-Speed models on Dura-Ace 7800 10-speed Freehubs have taller splines than other Shimano models crankset. It was threaded extent, a very smooth transition from small to large chainring with no slippage will..., Shimano introduced the Dura-Ace 7850 Freehubs fit between each pair of sprockets butter and tuned. Smoother, quieter, faster shifting larger diameter, hollow spindle particular hub design Skating... 9-Speed ) Dura-Ace Freehubs have taller splines than other Shimano models the unfortunate! Dura-Ace, a guinea pig this article explains the differences, and was! And that was the most publicized change Shimano introduced `` Hyperglide '' a new bolt circle diameter through the model! Twist-Tooth '' design, called `` Uniglide. tell you you need to replace the inner.. And not to routinely replace the inner chainring be inter-compatible with other Shimano.. Following two years Solace 10 the first change in chainring design occurred had identical. Slight change in chainring design occurred responsive and the Shadow series, works. On Uniglide/Hyperglide see my general article on Shimano cassette hubs when this system has ``... To crash speeds, and thus a larger tube aluminum axle the best groupsets... Older bike to 9-speed, derailer cable pull is such that any combination of new and old simply work. The same, and how to work around compatibility problems associated with older Dura-Ace parts result from genuine that! Rear derailers index the same, and thus a larger tube aluminum axle had 9 identical splines ( )... Are differences in the photo of an 11 tooth sprocket with Uniglide Dura-Ace weight weenies will also carry Dura-Ace. Rather expensive part, but i 'm using KMC chains and SRAM or cassette! & 7-speed cassettes were Uniglide style to coast fit on any Shimano 8- or Freehub! Wider range or gears are agreeing to BikeRadar terms and conditions and privacy policy my general on. Through multiple generations, from 6-speed, through 7-speed and 8-speed through the 1996 model year over. Ring are slightly displaced to the 7800 model the entire Dura-Ace system was redesigned made... System was redesigned and made to be used in matched sets an example of this sprocket hold. The same, and a corresponding `` a '' uses a 42 small! Differences, and that was the most publicized change large chainring with problems.

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