SRM POWERMETERS/COMPUTERS


2012 SRM Dura-Ace 7900 Powermeter System

  • Item: SRM811
  • $3045.00 - $4245.00
quantity

When Dura-Ace 7900 appeared, we gawked at the lusty, sculptured form. And from our first glance, we suspected that a 7900 SRM PowerMeter System might never be a reality. Part of what makes the 7900 crankset so beautiful presented serious challenges to the mating of it with an SRM spider. So it was not to be, or so we thought. But, as we should've expected from the PowerMeter pioneers at SRM, they devised a way to create the ultimate Shimano/SRM synthesis -- the SRM Shimano Dura-Ace 7900 Wireless PowerMeter System.

You see, the Hollowtech II crankarms of the Dura-Ace 7900 crankset are indeed beautiful, but they use the same technology as 7800 to achieve that benchmark Dura-Ace stiffness and performance. So in essence, they are functionally the same. The real improvement between 7800 and 7900 lies in the design of the chainrings. The Dura-Ace 7900 chainrings are hollow and were crafted in reaction to Shimano's testing with their nascent electronic Di2 group. The force transmitted by their Di2 front derailleur was too much for the existing rings. So they developed the hollow 7900 rings. Not only do they provide supreme service with the electronic mechanism, they raised the bar for manually shifted front systems. Never before have we had this kind of flawless performance.

SRM realized that they could utilize the existing 7800 crankarm and build a specially designed and calibrated spider to function with the 7900 chainrings. This is the necessary piece of the puzzle if you want to ride with an SRM PowerMeter on your Shimano Di2 equipped bike.

The crankset comes with a small frame-mounted bracket impregnated with a magnet. For those of you familiar with the wired generation of the SRM, you'll note that it looks an awful lot like the head of a sensor cable. The purpose of this magnet is to read cadence, and you must install it -- even if you don't care about cadence. Why? It's because Power = Torque x Cadence, so with no cadence reading you get no power reading.

The SRM Shimano Dura-Ace 7900 Wireless PowerMeter System comes in the crank length of your choosing -- 170mm, 172.5mm, or 175mm, and it will have either a standard 39/53 or a compact 34/50 chainring configuration. The SRM system employs the ANT+ 2.4ghz wireless transmission technology. So not only will it free you from the distraction of having wires all over your bike, but you'll have the freedom to use any ANT+ compatible CPU/receiver. We offer the Dura-Ace 7900 PowerMeter as a standalone item and also with four CPU options that will sync perfectly with your crank to accurately track your power data:

  • The Garmin Edge 800 GPS is for those addicted to touchscreen technology. It has nearly all of the same functions as their Edge 705, but it comes with the convenience and ease of a waterproof, rugged 2.6" touchscreen. The Edge 800 is fully GPS enabled. The best part is that data goes two ways with the 800 -- you can upload maps and routes from your PC or Mac into the Edge 800, and you can download the routes that you've just ridden. And like the 705, the Edge 800 is ANT+ compatible. This means that the 800 can read information from powermeters, heart rate monitors, and speed/cadence sensors so that you can fine tune, monitor, and analyze each and every ride. With the 800, you can enable Virtual Partner, a rider you create, who exists only in the Garmin device and rides at your goal parameters. Besides ANT+ and GPS capability, it has a barometric altimeter, thermometer, and automatic time zone adjustment. The built-in base maps will get you started, and an included data card is preloaded with City Navigator so you'll have detailed maps for all of the U.S and Puerto Rico. You can add micro SD cards for extra storage or for finer map detail with streets and/or topos. It also includes a premium heart rate strap and a speed/cadence sensor. The 3.5 oz. Edge 800 has a 1/4 turn mount that installs without tools on the handlebars or stem. It has a rechargeable Li-ion battery that gives the unit 15 hours of life before you'll have to plug it in and charge it with the included cable. The USB download cable is also included along with a quick start manual.
  • The SRM PowerControl 7 is the latest evolution of the benchmark SRM PowerControl. There's a reason that more Pro cyclists use SRM power equipment than any other -- absolute reliability. The PowerControl 7 offers a new button configuration, under the display, that allows the unit to be narrower than older versions. This makes it ideal for use between aero bars. At any given time you'll be able to read six different bits of information on the new display. And like the PowerControl VI, it reads altitude and temperature to correlate along with your power, speed, distance, and kilojoule data. It also has a motion sensing start/stop function. The PowerControl 7 is downloadable via an integrated mini-USB interface and comes with an oversized handlebar mount, a Suunto speed pod, and a Suunto heart rate chest transmitter strap. It can be used with the included SRMWin software and also with Training Peaks, WKO+, and other power software.
  • The Garmin Edge 500 is a GPS-enabled bike computer that allows you to program up to eight metrics of data on a display with two separate screens. With two screens and eight metrics per screen, you'll have up to 16 lines of data at your fingertips. It has the same metrics as the Garmin Edge 705, just without the mapping and virtual partner features of that unit, which makes the 500 both smaller and lighter. The GPS comes in handy when you want to see where you've ridden afterwards. The Garmin 500 comes with a bike mount, speed/cadence sensor, heart rate monitor strap, instruction booklet, owner's manual on CD, charger, upload cable, and software on CD. You can use Garmin Connect on the web as well and you can upload ride data into TrainingPeaks, WKO+, and other power software.
  • The CycleOps Joule 2.0 is the first cycling CPU made strictly with powermeters in mind. Not only does it have a fully customizable dashboard that can show up to eight lines of data at one time, it also has a reports mode and an activities mode. Reports means you can recall data from past rides as well as historic data averages on basic things like your highest power for a given time as well as compare normalized power and surges. In activities, you can program scripted workouts. The Joule comes with a speed sensor, heart rate monitor strap, instruction booklet, upload cable, charger, and software CD. You can use the included software, TrainingPeaks, WKO+, and other power software.