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Stages XTR M9100/M9120 Power L power meter crankarm - power measurement for Shimano 12-speed
The Stages Power L for Shimano XTR M9100 and M9120 is a power meter for left sided power measurement and comes pre-installed on a left XTR crankarm. It fits FC-M9100 or FC-M9120 12-speed cranks and is suitable for all frames in which Shimano Hollowtech II cranks can be mounted. Each Stages Power L is individually calibrated, resulting in a sensational measurement accuracy of +/- 1.5%. Active Temperature Compensation (ATC), which eliminates possible environmental influences, is central to determining correct performance data. It is not without reason that cyclists of all disciplines, including many professional cyclists, have relied on Stages Power technology for years. With the purchase of a Power L XTR M9100/M9120 power meter you get two months premium access to the training platform Stages Link for free.
Information regarding the return of batteries and electrical equipment:
Find out more here.
Application: Cross Country
Type: crankarm with performance measurement (left)
Compatibility: 1x, 2x
Crankarm Material: aluminium
Crankarm Length: 165.0 mm, 170.0 mm, 175.0 mm
Axle Diameter: 24 mm (Hollowtech II)
Compatible BSA Shell Width: 68 mm, 73 mm
Recommended Bottom Bracket: SM-BB93 or SM-BB94-41A Pressfit Hollowtech II (not incl.)
Tolerance: +/-1.5 percent
Point of Measurement: crankarm
Power Source: CR2032 button cell
Battery Life: min. 200 hours
Data Collected: cadence (20-220 UpM), power (0-2500 W), torque
Data Transfer: ANT+, Bluetooth
- compatible with Shimano XTR M9100 and M9120 drive sides
- compatible with most frame models, see Stages Support website
- compatible software: Stages Link, Training Peaks, Strava, Garmin Training Center etc.
- left side power measurement (sensor on left crankarm)
- flat design with robust connection between battery cover and housing
- battery service by user: tool-free battery change
- active temperature compensation
- built-in cadence sensors, no magnet necessary
- integrated LED display displays battery status and calibration result
- improved acceleration sensor and additionally integrated ring laser for improved cadence resolution
- wireless firmware update via Stages App
- Near Field Communication (NFC) with Tap-To-Pair for easy connection to many smartphones and other devices
- improved Bluetooth and ANT+ antennas increase data transmission strength by a factor of 6
- additional weight only 15 g
Stages Power Meter
No moving parts and everything packed under an extremely stable ABS-PC housing - the Stages power meter does not damage the structure and thus the stability of the crankarm. It adds the ability to measure power to the crank.
Power is the measure of the mechanical work you do on the bike and the most accurate way to measure your effort. In contrast to heart rate, which is strongly influenced by physiological factors such as stress, lack of sleep, caffeine, ambient temperature, time of day, fluid balance and other factors, performance shows exactly how much work you do and how effective your training is. Performance measurement is the perfect tool to understand what progress you are making during training, but also how performance levels and fatigue levels are developing. Simply put - if you want to know how in shape you are, check your power.
The cadence and torque data acquired (see below) are multiplied to determine the power of one pedal revolution.
In order to measure the torque, strain gauges specially developed by Stages are applied precisely along the crankarm. Strain gauges, which are also used in a similar form in space travel, can detect even the smallest bends in the stiffest crank. Each pedal revolution causes a minimal bend along the crankarm. This downward-directed force occurs with every revolution. Multiply this force by 9.8 m/s2 and the length of the crankarm to obtain the force applied per pedal revolution - this is the torque.
The Stages power meter measures cadence using an acceleration sensor (the same technology that allows smartphones to adjust the display according to position). The accelerometer is part of a proprietary electronic circuit board that eliminates the need for obsolete magnets, external sensors and cable ties to measure cadence. This state-of-the-art technology also allows the power meter to measure the position of the crank several times per revolution. This results in faster information transfer and better performance data.
Active Temperature Compensation (ATC)
Stages power meters are equipped with Active Temperature Compensation (ATC). Different temperatures cause strain gauges to expand or contract to a certain extent. ATC allows the power meter to compensate for temperature changes that would otherwise affect strain gauges and their ability to accurately measure forces. The most important thing is that the Stages ATC works automatically and continuously while riding - so you don't have to stop pedalling.
ANT+ / Bluetooth Transmission
The Stages power meter was the first power meter on the market to use Bluetooth smart transmission in addition to ANT+.
- enables bidirectional communication between the Stages power meter and a smartphone or Bluetooth enabled bike computer
- sends more data per second to end devices compared to ANT+
- makes every Stages power meter fit for the future, as updates are possible wirelessly
- no need for cables or external ports - simply update your firmware from your smartphone
- load training sessions from your smartphone easily and directly to Strava or TrainingPeaks.
ANT+ is the gold standard for wireless communication in the cycling and fitness industry. The system is simple, stable and allows cyclists to add performance measurement to the ANT+-enabled cycling computer.
Make your power meter fit for the future. The data your Stages power meter records can be transferred directly to the StagesPower app. Use the app to update your firmware and access innovations. Check if new firmware versions are available. Perform a zero calibration of the power meter using the app. Track power and cadence. Observe the battery level of the power meter. In addition, high-speed data recording is available, which impressively demonstrates the sensitivity of the Stages power meter and enables scientific data acquisition.
Stages Link offers cyclists of all levels individual coaching and knowledge transfer tailored to each athlete. As a desktop application or app, Stages Link is the hub of cloud-based coaching, knowledge platform, training analysis and a tool for maintaining your training equipment, developed in close collaboration with the analysis specialists at Today´s Plan. Stages Link customises training plans down to individual training sessions to optimise athletes' performance and enable them to achieve their goals. Stages Link will also help you set up your Stages Dash bike computer quickly and check your Stages power meter, but is also compatible with other manufacturers' equipment. When you purchase a Stages Dash computer, you will receive a free two-month access pass to Stages Link. Access to basic functions are always free.
Manufacturer Part Numbers:
165.0 mm: X91L-A
170.0 mm: X91L-C
175.0 mm: X91L-E
- 1 x Stages Shimano XTR M9100/M9120 left crankarm with power meter
- 1 x CR2032 batteries