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- Order number: SW10921
The Stages Power LR Ultegra R8000 comes as a complete crankset including spider and chainrings and offers a dual-sided measurement on both crank arms. The Stages Powermeter is now available in the 3rd generation. The Gen3 models have a more accurate measurement, stronger transmission power to the bike computer and an improved cadence sensor. The total weight of the crankset is increased by only 35 grams.
For mounting the Stages Power LR Ultegra R8000 you need the TL-FC16 tool.
Highlights and Downsides
- dual-sided power measurement with high accuracy (± 1.5%)
- 175h battery life with a CR2032 per side
- integrated cadence measurement
- very low weight (adds only 35g to the crankset)
- excellent durability
- automatic temperature compensation
- left/right power balance
- easy to swap between bikes
- compatible with all Shimano 11-speed road groups
- works with many bike computers and smartphones (ANT+ & Bluetooth)
- only compatible with Shimano 11-speed road groups
- TL-FC16 tool needed for installation
With the Stages Power LR Ultegra R8000 both crank arms are equipped with measurement electronics. Thus, power and force distribution can be measured individually for each leg. Especially in case of muscular imbalances, dual-sided systems provide an advantage. This makes the Stages Power LR Ultegra R8000 particularly suitable for ambitious riders who want exact power readings. For beginners and riders with on tight budget who can live without the last few percentages of accuracy, the single-sided Stages Power L Ultegra R8000 is a good alternative.
The power measurement takes place on both crank arms of the LR model. You can also decouple the two powermeters and use them individually on two different bikes. You get two power meters for the price of one.
Compatible bikes and groups
The Stages Power LR Ultegra R8000 is compatible with all Shimano 11-speed road groups (105, Ultegra, Dura Ace). If a Shimano crank is already installed on your bike, you can simply replace it with the Stages LR crank. If a crank from another manufacturer is installed, the bottom bracket probably has to be replaced as well.
The left power meter is mounted on the inside of the crank arm. Therefore, 10mm space is required between the crank arm and frame. With direct-mount brakes it is often too tight. You can check with a 10mm allen wrench whether a Stages power meter fits onto your bike. In the power meter area, the 10mm allen wrench must fit between the frame and crank arm:
Compatible bike computers and smartphones
Thanks to ANT + and Bluetooth Smart, the Stages power meter is compatible with all ANT + enabled bike computers and smartphones with Bluetooth Smart technology. With the 3rd generation transmission strength was increased by factor 6. Even triathlon watches, which were problematic with previous versions, now work seamlessly with the Stages power meter.
Construction and design
The Stages power meter are well protected in a flat composite housing. Strain gauges detect the slightest deformation of the crank arm due to the force applied to the pedal by the rider. Acceleration sensors are used to determine the cadence. This design makes it both discreet and well protected. Since the Stages power meter is firmly connected to the crank arms, the crank arms are included.
Stages has been very involved in professional cycling in recent years. The Stages power meter were thus represented in some Tour teams. In these extreme conditions for man and gear, the Stages power meter could prove itself.
The Stages Power LR Ultegra R8000 Powermeter is powered by two standard CR2032 button cells. The batteries are sufficient for about 175 hours of operation of the powermeter. The CR2032 is widely used and inexpensive. It is available at almost every supermarket. The battery can be changed without tools. The LED on the power meter provides information about the battery level.
The two powermeters have a low weight of just 35g (15g left and 20g right). The powermeters are firmly connected to the crank arms. The weight is therefore to be understood as additional weight to the crankset.
We were able to confirm the accuracy of +-1.5% several times on our calibrated Cyclus II ergometer in the laboratory and in comparison with other power meters on the road. The measurement accuracy must be put into perspective somewhat, since the measurement is only one-sided.
The cadence is determined by means of an accelerometer and an integrated ring laser and transmitted to the bike computer or smartphone. An additional cadence sensor is no longer necessary. Measuring cadence via acceleration sensors has long been a major challenge for engineers. In the 3rd generation of the Stages power meter, it now works perfectly.
When temperatures change, different materials expand differently. This can have a significant impact on the measurement accuracy of a power meter, as the strain gauges react to even the smallest changes. The Stages power meter therefore has active temperature compensation (ATC). This means that it delivers precise measurements even when temperatures change.
Each individual Stages power meter is individually calibrated at the factory. Something else is the zero calibration (also called "Zero Offset" or "Manual Zero"), which should be done before every ride. This is similar to a scale that also "zeros" itself before weighing. For zero calibration, the Stages power meter must be active and connected to the bike computer or smartphone. The left crank arm must now point straight down. Now the zero calibration can be performed on the bike computer or smartphone.
The measurements of the Stages power meter are distorted by oval chainrings and are usually 4-5% higher than with round chainrings. The more oval the chainrings are, the greater the influence on the power readings.
Setup / Firmware Updates
Unlike other power meters, the Stages power meter does not need to be specially set up or registered. The correct crank length is already stored in the power meter. Firmware updates require the Stages App (Android & IOS) and a smartphone. We recommend always using the latest firmware of the power meter and the cycling computer.
The assembly of the Stages Power LR Ultegra R8000 Powermeter is very simple. The existing crankset is simply replaced by the Stages crankset. For Shimano cranks, this requires only a standard 5mm allen key and the TL-FC16 tool. With a little practice, the installation is done within 5 minutes.
We have made good experiences with the durability of the Stages power meter. Due to its placement on the crank, the power meter is well protected against mechanical influences. In a crash, for example, a pedal power meter usually gets somewhat beaten up. This is where the Stages can score. The first generation had problems with the housings. The use of an unsuitable composite led to cracks forming in the housing and water being able to get inside. However, these problems have been completely resolved with the 3rd generation. However, it still happens occasionally that water gets inside. This is usually due to an improperly closed battery cover or an improperly fitted sealing ring. When replacing the battery, please make sure that the sealing ring is correctly seated and that the battery lid is fully locked.
Warranty and support
The Stages power meter comes with a 2 year warranty. The Stages power meters are manufactured in the USA in Boulder, Colorado. However, Stages also has a base in Germany, which is responsible for sales and support in Europe. The support is very good and extremely customer friendly. If there is ever a problem, we have a direct line to Stages Europe and can help you quickly.
left crank and right crank arm
adds 20gr to left crank arm and 15gr to the right crank arm
175+ hours (CR2032)
ANT+, Bluetooth Smart Ready
wireless via the Stages App
Training Peaks, Strava, Garmin Training Center and others
Power Range (Watts):
0 to 2500
Cadence range (rpm):
Water resistance rating:
170, 172.5, 175mm
Active temperature compensation
Accelerometer based cadence measurement
In the pack
✔ Stages power meter left and right
✔ Shimano Ultegra R8000 crankset incl. chainrings
|Carbon or aluminum:
|Single or double sided:
|left & right
|Road or MTB: