SRM for Praxis Works & eeWing

Spider Only


Delivery time: 4-5 Week, All power meters are built to order.

PowerMeter Circuit Board *

Chassis Configuration *

None Red Bundle PC8 +$500.00 Black Bundle PC8 +$500.00 Silver Bundle PC8 +$500.00

Delivery time: 4-5 Week, All power meters are built to order.

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All new chassis design is more robust than ever meaning efficient and consistent force transfer for ultimate accuracy
* To be used with DM 3 Bolt Cadet, Girder, Lyft and DH cranks
* Improved sealing = Increased water resistance
* Rechargeable using fully sealed magnetic connector
* 100hrs battery life
* LED lights indicate cadence, charging and fully charged
* Accuracy +/- 1%
* Weight 515-652g
* BCD 104

Price $1299 (Spider only)

SRM PowerMeter 9 – The Next Generation

SRM Spider PowerMeters are the Origin of mobile power measurement. Since 1986 we have continuously refined our PowerMeters to meet ever-higher standards in technology, accuracy and reliability. For that reason, our PowerMeters are widely seen as the Gold-Standard for training with power.

Our 9th generation Spider PowerMeter takes our proven formula and updates it with modern features. The result is a PowerMeter that is easier to use, even more accurate, longer-lasting, and has improved connectivity.

Thanks to a combination of angle and torque measurement, the PM9 is now able to measure with higher accuracy in very low cadence situations and oval chain-rings do no longer have an impact on the recorded data. The integrated temperature sensor allows for maximum accuracy in changing conditions. Users are now able to show L&R balance, as well as combined Pedal smoothness.

PowerMeter 9 comes with many usability improvements. First is the Magnet-less cadence mode, which allows you to use the PowerMeter without any cadence magnet.
PowerMeter 9 can be used with ANT+ and Bluetooth LE. It connects to pretty much any head unit and comes with a mobile App. The App gives you access to live torque data, battery status information, firmware updates, and much more.

The picture shown is for illustration purposes only. The actual product may vary due to product enhancement.

Additional information


±1% (PM9), ±2% (PM7)

Bolt Circle Diameter

104 mm / 4 bolts


Cadence Magnet (PM7), Magnetless Cadence (PM9)


ANT+ (PM7 & PM9), Bluetooth (PM9)

Cycling dynamics (PM9)

Combined Pedal Smoothness, Left/Right Balance


>100h – Rechargeable via magnetic charger


2 Years