All components are joined together to work as one, reinforcing each other for unparalleled performance. Conquer the steepest, longest climbs with this Compact PowerMeter featuring the Shimano Dura-Ace 7800 crankset. A 10th sprocket might have been the headline feature of Shimano’s new top-line groupset, but the Japanese company did far more than shift up a gear when it launched Dura-Ace 7800 in 2004. Also, i thought I saw another post that stated that the 7900 Dura-Ace series was the first to eliminate the noise trim function. After a long wait Shimano will also carry a Dura-Ace branded compact crankset (34/50) with the 7900 series group. Some online retailers specifically state that the DA7900 11-27 ratio cassette is not compatible with the 7800 rear derailleur. The oversized 17-tooth derailleur rollers significantly reduce the wrap-around radius of the chain, resulting in less friction. Some online retailers specifically state that the DA7900 11-27 ratio cassette is not compatible with the 7800 rear derailleur. The Dura-Ace name goes back to at least 1973 You can see the 1973 Dura-Ace Catalogue here.. You can also see the 1982 Shimano Dealer Catalogue here.. Dura-Ace was always Shimano's attempt to make a top-of-the-line parts group, but it was not really successful until 1984. The ergonomic shape of the the DA 7900 shifter is far superior than the 7800. CERAMICSPEED OSPW Rear derailleur cage for Shimano Ultegra + Dura Ace The CERAMICSPEED Oversized Pulley Wheel System (OSPW) is the logical consequence of frictional reduction. The Dura-Ace systems shaves off a little weight by using, for instance, aluminium for the front derailleur cage, rather than steel in the Ultegra version. As for quality of shifting and overall performance, my opinion is that 7900 and 7800 are very similar. Here is a brief history of Dura-ace. 7900 finally got that right. Re: 3 yr comparison. The left (front) shifter, the crankset, and both derailers may be specific for a triple gearing. Some people say its fine but more important to me is what Shimano says on the matter. DURA-ACE (7800 series) and new DURA-ACE (7900 series) / DURA-ACE Di2 (7970 series) Rear drivetrain Front drivetrain Brake ... * RD-7970 is not compatible ... ST-7900 NEW DURA-AC 7900 series DURA-ACE Di2 7970 series FD-7970 NEW NEW NEW ST-7970 NEW ST-7971 NEW FD-7900 DURA-ACE 7800 series Some people say its fine but more important to me is what Shimano says on the matter. The first […] I believe my response is correct. Trending at $112.33 eBay determines this price through a machine learned model of the product's sale prices … Shimano say the revised cable pull ratios on 7900 essentially make backwards-compatibility with 7800 brake callipers and front derailleurs a no-no. 1973 – The first Dura-Ace release The story begins in 1973, the same year which Campagnolo Super Record group was introduced. I don't see any discussion about the trim function on the SIs for ST-7900 or FD-7900 as I do for ST-6700 and FD-6700. Shimano's 7900 shift cable/housing set is ideal for the Dura-Ace 7900, Ultegra 6700, and 105 5700 STI levers with cable routing under the bar tape. The Dura-Ace groupset is the result of Shimano’s ongoing passion for technology. Dura-Ace is the admiral ship of Shimano, the Japanese (now multinational) manufacturer of cycling components (and some other things like fishing tackle and rowing equipment). Shimano Dura-Ace FC-7800 39 Tooth 10-Speed B-Type Chainring. $109.99. This is a SHIMANO DURA ACE 7900 Double Crankset Excellent gleaming condition and low miles from only one season in sunny So. And so now we have the newest edition, 9100. This is how Dura-Ace achieves ultimate supremacy. In fact, it was because of the under-the-bar-tape cable positioning change first designed for Dura Ace 7900 that the PTFE-lubricated housing was introduced. Dura-Ace FC-7800 double and FC-7803 triple 10-speed chainrings For best shifting performance, A-type rings should be used only with A-type rings, and … read more Unlike the jump from 7800 to 7900 with the two ten-speed groups, 9100 doesn’t feel like a misfire. 7900 vs 7800 I personally chose to ride Dura Ace from about 1981 to 2002 on my own bikes.