Kitarat: kitarakamat ›

"Ibanez’s new ZR bridge—which was a highlight of this year’s Winter NAMM show—is an absolute duh-fest. That is, once you see how the ZR has improved upon the classic Floyd Rose-style locking tremolo design, you may find yourself saying, "Duh, why didn’t anyone do that sooner?"
 
A problem with many conventional tremolo systems is that every time you use the bar, you create metal-against-metal grind between the mounting studs and the bridge’s knife-edged pivot points. If your bridge is floating, this small amount of friction can prevent the bridge—not to mention your tuning—from returning to the correct place. On the ZR, however, the bridge assembly swings on internal roller bearings that are all but frictionless (they’re housed inside the round hubs on either side of the bridgr Pla
 
Other cool features include a tension- adjustable tremolo arm, as well as a clever onboard intonation adjustment tool—a simple thumb-screw stored adjacent to the low E string. Simply remove it, screw it into the back of any string saddle, and it becomes a stopper bolt. Now, when you loosen the saddle with a hex wrench, the saddle stays put, and intonation adjustments are easily achieved with small turns of the stopper bolt—even while the string is at playing tension.
 
Last, but not least, in the ZR bridge’s back cavity you’ll find Ibanez’s new Zero Point system—a bonehead simple, but ingeniously effective backstop-type device that utilizes reverse-pulling springs to keep the floating ZR bridge stationary until you yank on the bar. This solves a number of problems that plague other locking trems. For one, you can rest your palm on the bridge without making the strings go sharp (unless you press extremely hard). It also allows you to hold one note while bending another without the first note drifting flat. And if you break the G, B, or high-E string, the guitar stays in tune enough for you to make it to the end of the song. (When I tested this feature by intentionally snapping the highest string, the other five strings stayed in tune relative to each other, though they did all go slightly sharp.) In addition, bridge tension can be adjusted with the backplate on, via a single spring-adjustment screw on the back of the instrument—hip!"
 
http://www.guitarplayer.com/story.asp?sectioncode=6&storycode=4345