SRM Powercontrol 7 $750.00
When SRM developed their wireless PC VI, we were pleased to offer the reliability of the SRM PowerMeter system with the unbridled simplicity of the ANT+ compatible wireless system -- just a crank and a computer and nothing to spoil the beauty of your racing bike. Now with the arrival of the latest PowerControl version, the SRM PC 7, your simplicity and convenience gets upgraded to a smaller and lighter package with a longer battery life.
If one powermeter is the Pro's choice, it has to be SRM. And part of having so many units on bikes in the peloton means that SRM gets top-notch feedback from those using their systems. Reports from the field indicated that the PC VI was tricky to fit between aero bars on some rider's setups. So the German trailblazers at SRM took it back to the drawing board and created a newer, sleeker, and narrower version. You'll see that the button layout on the PC 7 is now at the bottom enabling the squarer shape. Two other major improvements were made as well. It uses a Li-polymer battery to improve run-time to 120 hours as compared to 30 hours for the PC VI. It will spend more time on your handlebars and less time on the charger. And the PC 7 also now has a motion sensor. It will detect your ride start and turn on automatically.
The SRM PC 7 has a backlight display that makes it easier to read in certain atmospheric conditions. The display will show your current Power in watts, Cadence, Speed (mph/kph), Heart Rate, Energy (Kj), Training Zones, Intervals, Temperature (F/C), Altitude (m/ft), Ride Time, and Clock with averages and maximum figures for each value. You can set the PC 7 to record and store data at intervals ranging from 0.5 to 5 seconds. The recording interval will determine how much total data can be stored in the unit. Shorter intervals means more data per hour, so you'll fill up the built-in memory faster. For reference, a one second interval will yield 130 hours of memory to store your ride data before you'll need to download via the integrated mini-USB interface.
The ANT+ compatibility allows the PC 7 to sync with all SRM wireless crankset PowerMeters and any ANT+ or ANT+Sport speed sensors and heart rate chest straps. It comes with SRMWin software, but you may also use Training Peaks, WKO+, and other power analysis software to review your data.
What community has to say
Choose PC7 for the most accurate data
- Familiarity: I've put it through the wringer
There are a lot of Ant+ head units available nowadays and it seems that most riders overlook the Power Control 7 in favor of devices with GPS function. Here's why the PC7 is the best option if you're concerned about the accuracy of your power data.
The SRM records data on an 'event based' basis. That event is a full revolution of the crank arm. With each full revolution of the cranks, your data is collected and sent to the head unit. What happens when you don't finish a full revolution of the crank is where the PC7 has it's value over other head units. Data is sent from the crank to the head unit in bundles once every four seconds (one recording per second). Every time you coast, without finishing that last pedal stroke the crank can't quite process that last bit of data so it assumes that you continued at the same intensity that you were just riding at for those final 3 seconds before sending off that next bundle of 4 data points. So for three seconds that should show a value of 0 watts, your device is actually recording three seconds of whatever intensity you were just riding at previous to 0 watts. Every time you stop pedaling there'll be three seconds of data that are incorrectly recorded.
With the SRM PC7 and the SRMWin software, these erroneous data points are cleaned up. If you're using any other ANT+ head unit this is not the case. When looking at a road race, crit, mtb, or CX file (any ride where you stop and start pedaling frequently) this can have a very significant implication on the quality of the data you've recorded.
If you're going to train with power, you ought to record the data as accurately and precisely as possible and the SRM PC 7 bundled with an SRM wireless crankset allows you to do this better than any other ANT+ head unit on the market.
Can you use this head unit with a Quarq...
Can you use this head unit with a Quarq crank power meter?
waip932190, This computer is only designed to work with the SRMs. If you have a Quarq, your best bet is the Garmin or the Joule.
Can the srm 7 be used indoors. Is the...
Can the srm 7 be used indoors. Is the backlight strong enought to read.
marp696161, The display is fine indoors. The backlight just provides a bit more contrast for those days its hard to see.