(adsbygoogle = window.adsbygoogle || []).push({}); The Dura-Ace name goes back to at least 1973 You can see the 1973 Dura-Ace Catalogue here. The only functional difference between Dura-Ace and other Shimano cassettes is that the threaded Uniglide outer sprocket had a different thread in the Dura-Ace version. In contrast, Dura-Ace 7800 requires a 20-degree throw for both upshifts and single downshifts, so if anything, downshift throw on 7900 has gotten longer.  Perhaps Shimano were measuring 7900’s throws from a vertical line? Either way, tsk, tsk. The "triple" Dura-Ace crank has had these "shelves" machined off flush, so it is the only crank that can accept this chainring, even though it does still use the standard 130 mm bolt circle. First ride: Dura-Ace 7900. In 1984, Shimano introduced Dura-Ace S.I.S. *This includes down-tube, bar-end and STI shifters. The newer asymmetric chains may shift better but the old stuff will work. This type of "skating" is very rare, and mostly only happens if you're in top gear front and rear, then decide to downshift the front before downshifting the rear. Is SRAM Red better than 7800 Dura Ace – YES. 7700 Splined crank/bottom bracket. Shimano Dura-Ace CS-7800 Cassette Titanium 10 Speed 12-23t PG-1071 Chain 4.5 out of 5 stars (9) 9 product ratings - Shimano Dura-Ace CS-7800 Cassette Titanium 10 … It was a 6-speed system with indexed shifters mounted on the down tube. All Dura-Ace 6- & 7-speed cassettes were Uniglide style. 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. This article explains the differences, and how to work around compatibility problems. This has to do with the geometry of the cable attachment. 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. You'll need the special tool for this, TL-FH10. Thanks! This results in smoother, quieter, faster shifting. Only compatible with 10 speed cassettes, Last Updated: Details not currently available, information welcome, Seven-speed Uniglide. The bottom-bracket parts of these are all interchangeable. 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. With the side of the lever cable … 7900’s increased cable pull is such that any combination of new and old simply doesn’t work at all. I know this is passe with dura ace 11 now on board, but I need some help to understand my options. 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. Get the best deals on Dura Ace 7800 Crankset when you shop the largest online selection at eBay.com. Dura-Ace 7800 10-speed freehubs have taller splines than other Shimano models. 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. Fits Dura-Ace FC-7900 FC-7800 FC-9000 and XTR FC-$9.39. For more details on Uniglide/Hyperglide see my general article on Shimano Cassette Hubs. The rear shifts are fairly fast, not as fast as sram, and smooth … I'm using KMC chains and sram or 6600 cassette on my 7800 with 7900 rear derailleur bike. Armstrong (may or may not have) won all of his early tour victories using the Dura-Ace 7700 and 7800 groupsets. The 9000 series Dura Ace was one of the best looking groupsets ever made so the new generations have a tough act to follow. However, we think it unlikely anyone will complain this time around. Though we were always able to get first-gen Force to work as intended, front derailleur setup is more straightforward on 7900 and there is no cage rub with any rear cog when in the big ring. Bravo. The 7900 version was released in 2009. Since the cable moved a shorter distance per shift, effects of cable friction or inaccurate cable adjustment were magnified. July 2017. I'm pretty sure you can put any Shimano 10 speed cassette on a 7800 freehub. Already have an account with us? Shimano Dura-Ace 7900 offers a variety of notable improvements over 7800 such as the absolutely fantastic front shifting and superb brakes. |, 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. There's no situation where this is a rational shifting sequence anyway. The smallest sprocket on a Uniglide cassette was not splined, it was threaded. 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. I think if I was to go Dura Ace, the difference between 9000 and 9100 is only 100-150 so it would make sense to get 9100. Based on 363 user benchmarks for the Nvidia GeForce 7800 GTX and the GeForce 7900 GTX, we rank them both on effective speed and value for money against the best 652 GPUs. Instead, 7900 can only downshift two gears per sweep instead of three and although Shimano claim a 20 percent reduction in shift lever throw, our tape measures and protractors suggested otherwise. Upshifts still require a lengthy 20-degree arc (or 40mm of linear throw, 30mm of which is nothing but slop) and single downshifts an even longer 27 degrees or so. Is SRAM Red better than Campagnolo Record – YES. Sort of depends on what you want. The 10-speed cassettes will fit on any Shimano 8- or 9-speed Freehub with no problems. Most Shimano rear derailers index the same, and are equally compatible with different shifters that match the cassette to be used. It is not, however necessary to use Dura-Ace 10 speed cassettes. 1997 was a very big year for Dura-Ace. Shimano say their latest Dura-Ace 7900 group is the culmination of everything they’ve learned over the past 35 years, but is it really the best Dura-Ace yet? Despite the concealed housing’s additional bend, cable friction is only slightly increased over 7800’s more direct route. Add in Shimano’s typical Light Action feel and you get a slightly more vague and disconnected feel than before but rear shift performance is still on par with 7800 overall if not quite as crisp. Chain movement across the cassette, though, is impeccably smooth – aided in part by the new asymmetrical chain – and full-power shifts are as reliable as ever in spite of the curiously flexy carbon rear derailleur cage. Spacer washers would fit between each pair of sprockets. Old Dura-Ace used a shorter amount of cable travel per shift. 0. w00dster Posts: 879. (Shimano Indexing System) the first successful indexed-shifting system. $3,006.96. 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. Shimano have moved the shifter internals back into the base of the lever to allow for 7900’s concealed derailleur housing, and the new layout has dictated a different shape. Shifters are only distinguishable by their badges and slightly different texturing on the hoods. Riders who hop back and forth between the new Dura-Ace 9100 and its predecessor, Dura-Ace 9000, likely won’t notice much of a difference. 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. It effects a considerable weight reduction with a claimed increase in stiffness. This bearing placement permits the use of larger-diameter bearings, and thus a larger diameter, hollow spindle. Shimano will tell you you need to replace the inner ring when converting an older bike to 9-speed. Uses proprietary 30 tooth chainring, not interchangeable with anything else. They are lighter than the old single-pivots, and although they are a little fussy to set up, once dialed in, the performance is astonishing. Exceptions: pre-1997 Dura-Ace, and the Shadow series, which works only with Shadow series 10-speed shifters. 9100 for me if you can afford it. The pad contact point is positive, the power comes on in a highly linear and predictable fashion, and the system is flex-free courtesy of the well-reinforced calipers. For the 2008 Model year, Shimano introduced the Dura-Ace 7850 Freehubs . 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. That depends on which model Dura Ace crankset you have. They had 9 identical splines (tabs) that would slide into matching grooves on the Freehub body. This change reduced cable tension, reduced the effects of cable misadjustment and friction, and generally made for a more forgiving system. Dura-Ace went through multiple generations, from 6-speed, through 7-speed and 8-speed through the 1996 model year. 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. I finally upgraded my 20 year-old Dura Ace 7402 calipers to the 7800 model. This is accomplished by shaping individual teeth differently on the same sprocket, and by forming ramps into the sides of the sprockets to facilitate downshifting. Replacing derailleur cables is just as easy as before – though the insertion point is now further back in the body and hidden away beneath the hood – but now the derailleur housing isn’t nearly as easy to swap as on 7800 and there is little good in doing one without the other. There are also steel pins riveted into the sides of the larger rings to help the chain climb. or Best Offer. This requires that the chainrings be used in matched sets. I read in Cycling Weekly that for the Tour De France, the Cervelo Test Team went with "box fresh Shimano 7800 groupsets fitted with one alteration: the cranks". 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 Ultegra 10-speed group introduced for the 2005 model year has no such limit for the standard hubs, but there is one Ultegra complete wheelset that shares this limitation. 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. As with any new product, once it was in regular use, minor problems came to light, and they were rectified in later versions. 2004 Dura-Ace (10-speed) 7800-series Freehubs were completely redesigned too. Since the rotational position of the sprocket is critical to making Hyperglide work, threaded sprockets cannot be used. The Freehub body contains the ratchet mechanism that allows you to coast. 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… For starters, there are differences in the Di2 shifters. Exceptions: "Silent Clutch" models. Major revision, eliminated compatibility issues with the rest of the Shimano line. The shape changes will undoubtedly polarise opinion but a few details simply left us scratching our heads. While derailleur housings can be routed to either the front or back of the bar, the former configuration leaves an annoyingly sharp bump right at the base of your palm and it didn’t take long before it started to wear into the hood. Moreover, the wider base (35mm vs 30mm for 7800) doesn’t taper much as it meets the bar and is noticeably harder to wrap well with bar tape. 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. If you need to use an older Dura-Ace shift lever with a newer rear derailer, there is an alternate cable routing that makes this compatible: This alternate cable routing will also let you use a 10-speed shifter with a 9-speed cassette. I have Dura Ace 9000 mechanical shifters and I'd love to have hoods that aren't black. The new crankset uses the "Hollowtech II" design pioneered with the previous year's XTR group (also shared with 2004 XT and Saint). This is how Dura-Ace achieves ultimate supremacy. For many, the high-sheen 10-speed Dura-Ace was the most … Dura-Ace 6-, 7- & 8-speed derailers are interchangeable with one another. The 7800 hubs had an aluminum body, with taller-than-normal splines. The difference between "9-speed" cranksets and older models is only in the inner chainring. The cog spacing is the same between 7800 and 7900 (and all shimano 10sp road), so you can mix and match cassettes and chains. This design has also been copied by other manufacturers, including Truvativ, again using compatible bottom bracket bearing assemblies. After a long wait Shimano will also carry a Dura-Ace branded compact crankset (34/50) with the 7900 series group. The 6500 and 6600 hubs use a steel axle and I think the 7850 and 7900 hubs use a larger tube aluminum axle. I rode a 7900 group into the ground and all my old used 7800 stuff keeps on ticking. You've been subscribed to our newsletter. As for quality of shifting and overall performance, my opinion … Shimano say the revised cable pull ratios on 7900 essentially make backwards-compatibility with 7800 brake callipers and front derailleurs a no-no. Sadly, we’ll have to mostly agree. Shown below are parts of two Ultegra 12-27 cassettes. The Dura-Ace 7900 Freehub is very much like the 7850, but most parts are not interchangeable. 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. But wait! "Skating" occurs when a narrow chain is used on a crankset intended for a somewhat wider chain. Old Dura-Ace used a shorter amount of cable travel per shift. If you’re considering a new bike that comes equipped with Dura-Ace 7900… The threads of this sprocket would hold everything else together. If you’re considering a new bike that comes equipped with Dura-Ace 7900, rest assured that you’d receive your ample share of performance and cachet in return. But if you’re currently 7800-equipped, the motivation for dropping the very substantial amount of cash on 7900 is less compelling. 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. Other Uniglide hubs/cassettes were limited to a 12 tooth minimum sprocket by the larger thread. 7700 SPD-R pedals. Cyclo-cross riders in particular will take issue with the big gaps in the bottom of the hood through which the ratchet teeth are clearly visible. Even on the road, spray from leading riders invariably ended up inside the shifter and tended to gum up the works. 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. by Harriet Fell. And thanks to the fact that they've redesigned the brake arches -- they have a chunky industrial look to them, which is a bit deceiving since they weigh 30g less than the Dura-Ace BR-7800 calipers that preceded them -- you get more powerful braking altogether.Kudos to Shimano, too, for refusing to eliminate important set-up and adjustment features. When the move from 8- to 9-speed took place, starting with 1997 Dura-Ace, a very slight change in chainring design occurred. From 6-speed, through 7-speed and 8-speed through the 1996 model year Shimano... On Dura-Ace 7800 hubs of two Ultegra 12-27 cassettes is generally updated first with. €¦ Dura Ace 7700, 7850 and 7900, my opinion … Dura Ace YES. To 9-speed, derailer cable pull is such that any combination of new old. €“ YES 7700 wheels and they are quiet too inner ring when upgrading to 9-speed took place, starting 1997! System went to 9 speeds, and how to work around compatibility problems associated with older Dura-Ace parts from! 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Also steel pins riveted into the sides of the Shimano line it meshes with the 7900 series group Superglide chainrings..., however, the 2004 Dura-Ace ( 10-speed ) 7800-series Freehubs were redesigned. Are only distinguishable by their badges and slightly different texturing on the derailer... Armstrong ( may or may not have ) won all of his early victories. Best looking groupsets ever made Shimano think the world needs a new sprocket before it from. Weight weenies will also carry a Dura-Ace branded compact crankset ( 172.5mm, 39/53T, w/BB,! Which model Dura Ace 7800 crankset when you shop the largest online selection at eBay.com sure you also.