SRM SRAM 8-Bolt MTB Power MeterNovember 14, 2023
$1,299.00 – $1,374.00
Pro-level power meter for your SRAM 8-bolt MTB crankset!
SRM SRAM 8-Bolt MTB Power Meter
The SRM SRAM 8-bolt MTB Power Meter is a great way to add power to your SRAM MTB crankset. This spider-based power meter measures power from both legs and the PM9 version now has improved accuracy and features like power balance, automatic temperature compensation and Bluetooth SMART.
This power meter is compatible with 8-bolt cranks and fits both boost (52 mm chainline) and standard (49 mm chainline) frames. It’s compatible with 104 BCD 4-bolt round and oval chainrings.
Key Product Details
This SRM fits SRAM direct mount 8-bolt cranksets. Regarding chainrings, it utilizes a 104×4 bolt pattern, which is different than the direct mount chainrings found on many SRAM MTB cranksets. If you don’t already have a 104×4 BCD chainring, you can order one on this page along with the power meter. See Compatibility tab for more information.
This SRM power meter is a spider-based power meter and is therefore able to measure power from both legs.
Dual-leg power measurement, accurate to +/- 1.0%, 100 hours of battery life, rechargeable battery, left/right power balance, ANT+ and Bluetooth compatibility. See Specs tab for more information.
Advice From Our Staff:
SRM makes a top notch, reliable product. SRAM 8-bolt MTB cranksets are a newer standard but becoming increasingly popular. This power meter measures from both legs, is accurate and reliable. Having said that, it competes with our Sigeyi SRAM MTB power meters which are similar power meters, but are bit more affordable. If you’re an SRM fan, you’ll love the updated compatibility and features of this unit. Otherwise, you might give the Sigeyi a try, which is a great unit at a more affordable price.
While not listed as an option above, you can bundle the SRM PM9 Origin Power Meter with a SRM PC8 Bike Computer. When you do, you get $249 off the standard price of the PC8. Please contact us if you would like this option.
Other Versions to Consider
SRM SRAM MTB 3-Bolt: We also have the SRM SRAM MTB Power Meter which fits SRAM 3-bolt MTB cranksets. Please contact us if you are not sure which version you need.
Crankset: The SRM SRAM 8-Bolt MTB Power Meter fits SRAM direct mount 8-bolt cranksets. This includes the new SRAM Transmission T-Type 8-bolt cranksets. Before purchasing, please confirm that your crankset uses the 8-bolt interface as shown below.
Chainrings: This power meter requires a 104 BCD 4-bolt MTB chainring (which is different than the direct mount chainrings found on many SRAM MTB cranksets). If you don't already have a 4-bolt chainring, you can order one on this page along with the power meter. If you purchase a new chainring, we will bolt it on to your power meter before shipping, which will make installation that much easier when you receive it.
Please note, if you are using this power meter on a SRAM T-Type Transmission drivetrain, we recommend the Wolf Tooth Components 1x 104 BCD MTB Chainring, which is compatible with these drivetrains.
The smallest chainring this power meter will fit is a 30T round or 32T oval chainring.
SRM SRAM MTB 8-Bolt Specs
|Name||SRM SRAM MTB Power Meter|
|Location of Power Measurement||Spider|
|Left or Both Legs Measured||Both|
|Independent Left/Right Measurement||Yes - Power Balance|
|Installation||More involved (60 min. estimated)|
|Speeds||11- or 12-speed|
|Chainline Spacing||Boost and Standard|
|Communication Protocol||ANT+ and Bluetooth SMART|
|Claimed Accuracy||+/- 1.0%|
|Active Temperature Compensation||Yes|
|Battery Life||100 hours|
|Method of Cadence Measurement||Accelerometer|
|BCD||104 mm 4-bolt|
|Q Factor||145.5 mm|
In the Box
- SRM Power Meter
- Chainring if purchased
- SRM USB Charger Cable
- SRM PC8 Cycling Computer (if purchased)
- Handlebar mount (if SRM PC8 is purchased)
Tools Needed for Installation
You will need the following tools for installation of this product. You can purchase many of these commonly used tools in our store.
- 8 mm Allen key
- T25 Torx bit
Common Questions and Answers
Question: What other power meter options do I have for my SRAM 8-bolt crankset?
- Quarq and Sigeyi also make an 8-bolt MTB power meter spider. Please check out this FAQ page to learn more about the differences between these power meters: SRAM Quarq XX1 vs. SRM SRAM MTB Power Meter vs. Sigeyi AXO SRAM 8-Bolt.
Question: Can my SRM PM9 power meter store ride data?
- Yes! The SRM PM9 Power Meter is capable of having rides, torque data, heart rate and core body temperature stored on the circuit board and downloaded to a .fit file. For more information please see our FAQ: Can my SRM PM9 power meter store ride data?