The direct answer: all three power meter pedals claim the same ±1% accuracy, and independent lab and road testing from DC Rainmaker and Cycling Weekly backs that claim up for all three — so the real decision now comes down to price and pedal ecosystem, not precision. Favero Assioma Duo is the cheapest by a wide margin at $499. Garmin Rally RK200 is the most expensive at $1,099.99, but it’s the only one with a swappable pedal body that moves between road, mountain bike, and gravel styles. Wahoo Powrlink Zero, corrected this update to its current $999.99 dual-sided price, is no longer the middle-price option it once was — it now sits close to Garmin, with weight as its main differentiator.
The Full Comparison, Upfront
| Favero Assioma Duo | Wahoo Powrlink Zero | Garmin Rally RK200 | |
|---|---|---|---|
| Price (dual-sided) | $499 | $999.99 | $1,099.99 |
| Claimed accuracy | ±1% | ±1% | ±1% |
| Weight (pair) | 303g | 273g | 326g |
| Battery | Rechargeable, 50+ hrs | Rechargeable, ~75 hrs | LR44 coin cell, ~120 hrs |
| Swappable pedal body | No | No | Yes — road, SPD-SL, SPD/MTB |
Prices verified against current manufacturer and retailer listings; see the price note below the accuracy table.
The Price Column: Favero Is No Longer Just Cheaper — It’s Half the Price
At $499, Favero Assioma Duo now costs less than half of either competitor — a gap that didn’t exist when Wahoo Powrlink Zero’s dual-sided price was closer to $680. Verified against Wahoo’s own product listings and Cycling Weekly’s long-term review, the current dual-sided Powrlink Zero retails at $999.99, putting it within about $100 of Garmin Rally RK200 rather than roughly $400 below it. That changes the shape of this decision: it’s no longer “cheap, middle, expensive,” it’s “cheap” and then two premium options within $100 of each other.
The Accuracy Column: All Three Claim ±1%, and Independent Testing Backs Every One of Them
Every pedal here claims ±1% accuracy, and unlike a lot of spec-sheet claims, this is one where independent testers have actually checked the math — not just for one of the three, but for all three.
| Pedal | Manufacturer’s claim | Independent finding | Source |
|---|---|---|---|
| Favero Assioma Duo | ±1% (raised from ±2% in 2018) | Indoor comparison found about 4 watts apart on a 470-watt effort (under 1% difference); outdoor climb testing without re-zeroing showed roughly 3-5 watts of variance. Reviewer reported “zero issues with accuracy.” | DC Rainmaker in-depth review |
| Wahoo Powrlink Zero | ±1% (the reviewer notes this is a self-referential claim — accurate relative to itself, not an absolute lab standard) | Tracked within 2 watts of a Wattbike Atom smart bike over a 30-minute session; identical 220-watt average on a steady 10-minute effort. Sprint peaks ran slightly lower than the Wattbike, attributed to strain-gauge vs. load-cell measurement differences rather than inaccuracy. | Cycling Weekly long-term review |
| Garmin Rally RK200 | ±1.0% | “Spot-on” agreement with Quarq, PowerTap, and Stages power meters on indoor and road efforts. One real caveat: switching between substantially different temperatures without re-zeroing produced an offset until manually recalibrated. | DC Rainmaker in-depth review |
The takeaway: none of these three is meaningfully more accurate than the others in independent hands. Garmin’s temperature-offset caveat and Wahoo’s sprint-peak variance are both real but minor and calibration-fixable — not evidence any of the three claims is inflated.
The Weight Column: Grams Mostly Matter If You’re Racing
Wahoo Powrlink Zero is the lightest at 273g for the pair, 30g under Favero Assioma Duo (303g) and 53g under Garmin Rally RK200 (326g). For most riders that gap is invisible; for someone chasing marginal gains on a race bike, it’s a real if small differentiator — and now the only clear reason to pick Wahoo over Favero at a near-identical price point to Garmin.
The Battery Column: Rechargeable vs. Coin Cell Is a Lifestyle Choice, Not an Accuracy Question
Favero and Wahoo both use rechargeable batteries (50+ and roughly 75 hours per charge respectively); Garmin uses a replaceable LR44 coin cell rated for up to 120 hours. Neither approach is more accurate — it’s a maintenance tradeoff. Rechargeable means one more USB cable to manage; coin cell means occasionally buying a $2 battery instead, but the longest runtime of the three between changes.
The Pedal-Body Column: Only Garmin Swaps Between Bike Types
Garmin sells the Rally system with interchangeable pedal bodies, so the same power-measuring spindle moves between Look Keo-style road pedals, SPD-SL road pedals, and SPD mountain bike/gravel pedals depending which body you buy. Neither Favero nor Wahoo offers this — both are single-ecosystem pedal designs. If you genuinely ride road and gravel or mountain bikes and don’t want a separate power meter for each, this column is the whole decision by itself, regardless of what the price and weight columns say.
Prices are approximate, current as of publication, and change frequently — confirm the latest price with the retailer before buying.What the Corrected Numbers Mean for Your Wallet
Buy Favero Assioma Duo if you want independently verified accuracy at the lowest price by a wide margin — at $499 it now costs less than half of either alternative. Buy Wahoo Powrlink Zero specifically for the weight savings or because you’re already deep in Wahoo’s bike-computer ecosystem; at $999.99 it no longer wins on price. Buy Garmin Rally RK200 if you ride multiple bike types and want one power meter with swappable pedal bodies — at $1,099.99 it’s the most expensive, but for that specific use case, nothing here replaces it.
How We Checked These Numbers
PicksWeTrust did not physically test these three power meters against a lab-grade reference for this comparison. Pricing was verified directly against Favero’s own shop, Wahoo’s current retail listings, and a recent Garmin-authorized dealer listing for Rally RK200. Accuracy claims and independent test findings were verified against DC Rainmaker’s in-depth reviews and Cycling Weekly’s long-term Powrlink Zero review, each named in the table above rather than summarized generically. More on our process is on our editorial standards page.
FAQ
Is the Wahoo Powrlink Zero still the mid-price option in this group?
No. Its current dual-sided price is $999.99, not the roughly $680 it’s sometimes still listed at by outdated sources — that puts it within about $100 of Garmin Rally RK200, not squarely between Favero and Garmin.
Has independent testing confirmed all three pedals’ ±1% accuracy claims?
Yes, in each case reviewers found results consistent with the claim: Favero within roughly 1% of comparison meters, Wahoo within 2 watts of a reference smart bike on steady efforts, and Garmin in “spot-on” agreement with three other power meters aside from a temperature-recalibration caveat.
Can I move a power meter pedal between different bikes?
Yes, all three install and remove with a standard pedal wrench in a few minutes. Garmin Rally RK200 goes further, letting you swap the pedal body itself between road, SPD-SL, and SPD/mountain bike styles using the same power-measuring spindle — something neither Favero nor Wahoo offers.
Do these pedals need a bike computer or watch to display power?
Yes. None of the three shows wattage on the pedal itself — they transmit over ANT+ and Bluetooth to a paired bike computer, GPS watch, or compatible app, which is where you actually read the number.
Which power meter pedal has the longest battery life?
Garmin Rally RK200 claims up to 120 hours on its replaceable LR44 coin cell, ahead of Wahoo Powrlink Zero’s roughly 75 hours and Favero Assioma Duo’s 50+ hours per charge, both of which use rechargeable batteries instead.
Pair your power meter with a dedicated heart rate strap? See our heart rate chest strap comparison. Browse more in our Wearable Tech category.
