In 1984, Shimano introduced Dura-Ace S.I.S. The same geometry was adapted for 9-speed Dura-Ace when it was introduced in 1997. I'm generally very supportive of Shimano, but I'm really dismayed by the very unfortunate direction taken with the Dura-Ace triple. Exceptions: "Silent Clutch" models. 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. 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. You can unsubscribe at any time. 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? 8-speed Uniglide cassettes and hubs were made only for the 1989 model year, so they are quite uncommon. replace the Freehub body with an 8-9-10 speed Hyperglide unit, Museum of Mountain Bike Art & Technology, Shimano Timeline. I have a bike that has a 100% dura ace 9 double drivetrain and need to replace a shifter. This bearing placement permits the use of larger-diameter bearings, and thus a larger diameter, hollow spindle. 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. The bottom-bracket parts of these are all interchangeable. 0. w00dster Posts: 879. The cog spacing is the same between 7800 and 7900 (and all shimano 10sp road), so you can mix and match cassettes and chains. 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. The interchangeability issue only applies to that particular hub design. 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. 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. This same system is used for most non-Dura-Ace Freehubs. Newer "Superglide" chainrings from Shimano use similar features to the rear Hyperglide system to improve front shifting. The smallest sprocket on a Uniglide cassette was not splined, it was threaded. One of the risks of buying into a brand new system is that you are, to some extent, a guinea pig. In 2004, the crank and bottom bracket changed. Fits Dura-Ace FC-7900 FC-7800 FC-9000 and XTR FC-$9.39. 5- and 6-speeds used 3.65 mm spacers, 7-speed generally 3.1 mm, 8-speed 3.0 mm. If you are foolish enough to downshift the front while standing up, this skating could conceivably cause you to crash. $3,006.96. 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. With the side of the lever cable … It effects a considerable weight reduction with a claimed increase in stiffness. Dura Ace 7800/7900 vs 9000. 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. For the 2008 Model year, Shimano introduced the Dura-Ace 7850 Freehubs . The Dura-Ace groupset is the result of Shimano’s ongoing passion for technology. The Freehub body is the part the sprocket cassette mounts to. 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. Most Shimano rear derailers index the same, and are equally compatible with different shifters that match the cassette to be used. There's no situation where this is a rational shifting sequence anyway. For this system to work as smoothly as it is designed to, the locations of the teeth on the smaller ring should be specifically placed with regard to the positions of the teeth of the larger ring. With the move to 9-speed, derailer cable pull was standardized throughout the Shimano line. There are also steel pins riveted into the sides of the larger rings to help the chain climb. 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… 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. Instead of using a crankset with two sets of mounting holes, as with other modern triple sets, the 30 tooth chainring attaches to the 39 tooth ring, rather than to the crank itself, in the manner of a Willow Triplizer or a TA conversion chainring.