SRM PM9 SRAM 8-Bolt MTB Power Meter
The SRM PM9 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
Compatibility:
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.
Power Measurement:
This SRM power meter is a spider-based power meter and is therefore able to measure power from both legs.
Key Features:
Dual-leg power measurement, accurate to +/- 1.0%, 100 hours of battery life, rechargeable battery, left/right power balance, ANT+ and Bluetooth compatibility.
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.
Compatibility
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.
In the Box
- SRM Power Meter
- Chainring (if purchased)
- SRM USB Charger Cable
Specs
| Name | SRM PM9 SRAM MTB Power Meter |
| Bike Type | MTB |
| Location of Power Measurement | Spider |
| Left or Both Legs Measured | Both |
| Independent Left/Right Measurement | Power Balance |
| Installation | More involved (60 min. estimated) |
| Chainring Configuration | 1X |
| Speeds | 11- or 12-speed |
| Chainline Spacing | Boost or Standard |
| Communication Protocol | ANT+, Bluetooth |
| Claimed Accuracy | +/- 1.0% |
| Active Temperature Compensation | Yes |
| Weight | 114 grams |
| Battery Type | Rechargeable |
| Battery Life | 100 hours |
| Method of Cadence Measurement | Accelerometer |
| BCD | 104 mm 4-bolt |
| Q Factor | 145.5 mm |
| Warranty | 2 years |
Why Buy from Power Meter City
1. We ship fast! All orders ship on the same day your order is placed!
2. Free shipping on all orders in the U.S.
3. We are an authorized SRM dealer and this product comes with a full warranty.
4. Expert advice and customer service in case you need any help.
About our Company
At Power Meter City, we focus on power meters and related accessories and components. Our focus on these products means we can offer you the best possible selection, advice and service.
We have been in business since 2016 and are based in southern California. We are an authorized dealer of every product we sell.