Product Description
By now, you should be familiar with the name, the Manx Missile. Charting the trajectory of his career through a couple of teams, and dozens of stage wins, one component has remained a fixture of his many bicycles?the Shimano Dura-Ace 7900 Wireless Powermeter. Mixing Dura-Ace 7800 crankarms, DA-7900 chainrings, and the most sophisticated power measuring technology in cycling, the DA-7900 Wireless Powermeter provides the most accurate Shimano power readings available.The Shimano Dura-Ace 7900 Wireless Powermeter matches precise power measurement with the stiffest crankset in the business. SRM pulled this off by improving the design of the meter's strain gauges. The eight strain gauges for the Powermeter are a system of sensors that detect any resistance and vary their output when experiencing applied force. The next step is for the strain gauges to convert this data into electrical resistance so it can be measured. The refinements to the system offer stellar results. The 7900 Powermeter expresses an accuracy of +/- 2.0% between 30 and 255 rpm with a wattage range between 0 and 4096 watts. Compared to the new G3 PowerTap that has the same range of accuracy, but only between 40 and 130 rpm, the SRM Powermeter has nearly doubled the system accuracy of its greatest competitor while shaving grams in the process. You can also expect a weight savings over other power measurement systems, as the 7900 Wireless Powermeter weighs in at an alarmingly low 820g with cranks, Powermeter, and chainrings. SRM also extended the battery life of the 7900 Powermeter to roughly 1400 hours, and provides a three-year manufacturer's warranty.To provide a comfortable duration in the saddle, the Dura-Ace 7900 Powermeter provides the best U and Q factors of any crankset, at 147.5mm. This is due to its reduction of lateral dimensions, and innovations with outboard bearing technology. More importantly, Shimano did this without compromising the driving factor of any crankset -- power transfer. The n
| Price: | $3,045.00 |
| as of Mon, 11 Feb 2013 09:52:45 GMT | |
Product Details
- Size: 170mm, 39/53
- Color: One Color
- Brand: SRM
- Model: DA7900_7039
- Dimensions: 1.79 pounds
Features
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Arm Material: aluminum
Arm Length: 170 mm, 172.5 mm, 175 mm, 177 mm
Bottom Bracket: Not included
BB Type: FC-7800, FC-7900
BB Threading: English
Bolts: alloy
Rings: 2
Spindle:
Compatible Components:
Weight: 820 g
Recommended Use: Power training, Road racing, Road cycling
Manufacturer Warranty: 3 years
Bolt Circle Diameter: 130 mm - Chainring Sizes: 39 53, 34 50
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