Looking to upgrade your Easton crankarms with a power meter but need help determining the suitable one?
Easton manufactures two crankarm models, EC90 SL (carbon) and EA90 (aluminum). There are two power meter options for these crankarms;
- Spider-based
- Pedal-based
In this article, we’ll explore the three options in detail.
Spider-based power meters
Three spider-based power meters fit an Easton EC90 or EA90 crankarm;
- Power2max NG Road, top-of-the-line model, ±1% accuracy with temperature compensation and automatic zero offset.
- Power2max NGeco Road is a mid-range and more affordable model with ±2% accuracy and uses a coin CR2450 battery.
- Sigeyi AXO is the best budget option with features found in mid to high-end models.
Both Power2max models are available in 110 or 130 BCD for a 5-bolt chainring or 110-4S for a 4-bolt Shimano chainring. The Sigeyi AXO is only available in 110 BCD. The Sigeyi option would limit chainring sizes to 52/36T or lower.
| Comparison | Power2max NG Road | Power2max NGeco Road | Sigeyi AXO |
|---|---|---|---|
| Accuracy | ±1% | ±2% | ±1.5% |
| BCD | 110, 130, 110-4S* | 110, 130, 110-4S* | 110 |
| Battery type | Rechargeable | CR2450 | Rechargeable |
| Battery life | up to 150h | up to 300h | 120 hours |
| Warranty | 2 years* | 2 years | 2 years |
| Price | $940 | $390 | $338 |
Notes :
- * 110-4S is for 4-bolt Shimano chainring.
- ** Can be extended from 2 to 5 years for €150 (approx $155 / £131 / A$233).
More reading : Power2max NG Road vs NGeco Road Comparison
Pedal-based power meters
For pedal-based power meters, you can choose between;
- Garmin Rally RS (Shimano) or RK (Look)
- SRM Exakt
- Favero Assioma
Pedal-based power meters are the easiest to install by just swapping out the existing pedals.
| Comparison | Garmin Rally | SRM Exakt | Favero Assioma Duo | Favero Assioma Duo-Shi |
|---|---|---|---|---|
| Accuracy | ±1% | ±2% | ±1% | ±1% |
| Weight (pair) | 320g to 326g | 310g | 303g | varies** |
| Connectivity | ANT+, BLE | ANT+, BLE | ANT+, BLE | ANT+, BLE |
| Battery | LR44/SR44 | Rechargeable | Rechargeable | Rechargeable |
| Battery Life | 120 hours | 30 hours | 50 hours | 50 hours |
| Cleat type | Shimano SPD-SL | Look Keo | Look Keo | Shimano SPD-SL |
| Pedal stack | 13.5mm | 10.5mm | 10.5mm | varies*** |
| Q-factor | 53mm | 54mm | 54mm | 64/65mm**** |
| Warranty | 1 year | 2 years | 2 years | 2 years |
| Price | $1100 (dual) $650 (left) | $1300 (dual) $750 (left) | $759 (dual) $495 (left) | $659 (dual) |
Notes :
- * Weight – Garmin Rally RS200 (320g), Rally RK200 (326g), Rally RS100 (160g), Rally RK100 (163g)
- ** Weight depends on the Shimano pedal body used. The spindles weigh 198g/pair and 314g/pair when used with a Shimano R8000 pedal body.
- *** Pedal stack depends on the Shimano pedal body used.
- **** Q-factor – 65mm (Shimano R8000/R6800), 64mm (R550/R540)
Garmin Rally
The Garmin Rally is the latest power meter by Garmin, with four models.
- RS200, dual-sided, Shimano SPD-SL cleats
- RS100, left-sided, Shimano SPD-SL cleats
- RK200, dual-sided, Look Keo cleats
- RK100, left-sided, Look Keo cleats
More reading : Garmin Rally RS200 Review
SRM Exakt
The SRM Exakt is an SRM power meter built into a Look Keo pedal. It’s available in single-sided (left) or dual-sided options.
Favero Assioma
The Favero Assioma is available in three variants;
- Assioma Duo, dual-sided, Look Keo cleats
- Assioma Uno, left-sided, Look Keo cleats
- Assioma Duo-Shi, dual-sided, Shimano SPD-SL cleats
The Favero Asisoma Duo-Shi is sold with pedal spindles only and without a pedal body. You’ll need to use an existing Shimano pedal and install it on the Favero Assioma Duo-Shi.
Compatible pedal bodies are the Shimano PD-R8000, PD-R7000, PD-6800, PD-R550, and PD-R540.
Alex Lee is the founder and editor-at-large of Mr. Mamil. Coming from a professional engineering background, he breaks down technical cycling nuances into an easy-to-understand and digestible format here.
He has been riding road bikes actively for the past 12 years and started racing competitively in the senior category during the summer recently.