Looking for power meter options for your Specialized or S-Works crankset?
There are two options;
- Spider-based
- Pedal-based
In this article, we’ll explore the three options in detail.
Spider-based power meters
Comparison | Power2max NG Road | Power2max NGeco Road | Quarq DZero | Sigeyi AXO |
---|---|---|---|---|
Accuracy | ±1% | ±2% | ±1.5% | ±1.5% |
BCD* | 110, 130 | 110, 130 | 110, 130 | 110 |
Battery type | Rechargeable | CR2450 | CR2032 | Rechargeable |
Battery life | up to 150h | up to 300h | 200 hours | 120 hours |
Warranty | 2 years | 2 years | 2 years | 2 years |
Price** | $940 | $390 | $760 | $338 |
Four spider-based power meters fit a Specialized/S-Works crankarm;
- Power2max NG Road is a top-of-the-line model from Power2max with ±1% accuracy and a rechargeable battery.
- Power2max NGeco Road is a mid-range and more affordable option with ±2% accuracy and uses a CR2450 coin battery.
- Quarq DZero is compatible with all carbon Specialized and S-Works crankarms from 2013 to 2018. It’s not compatible with the dual-sided S-Works Power Cranks.
- Sigeyi AXO is a newcomer to the power meter space. It’s priced very competitively at $338 and has similar features to the top-of-the-line Power2max NG Road.
All models, except the Sigeyi AXO have an option for 110 or 130 BCD. You can reuse the existing 5-bolt chainring and only swap out the non-power meter spider.
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.