Garmin Rally vs Favero Assioma Power Meter Pedals — Which Are Worth It?

The Garmin Rally vs Favero Assioma decision has gotten complicated with all the conflicting forum noise flying around. I spent three weeks paralyzed by it last spring — staring at two price tags on two pedals that looked identical on paper. Spoiler: they’re not identical. And that distinction matters a lot depending on how you actually ride.

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As someone who rides a Specialized Tarmac SL6 with Shimano cleats and logs 150–200 miles a week, I learned everything there is to know about pedal-based power meters during a genuinely miserable February testing block. I run TrainerRoad for structured winter training. My friend ran the Rally RS200 on his bike while I ran the Assioma Duo on mine — same routes, same conditions, side by side. What came out of that might save you a few hundred dollars. Or it’ll confirm the premium is worth it. Depends on who you are.

Price Gap — Is Double the Cost Justified?

Let’s get the uncomfortable part out first. The Favero Assioma Duo retails around $599 USD. The Garmin Rally RS200 — dual-sided, Shimano-compatible — runs $1,199.99 USD at REI, Clever Training, and Garmin’s own site. That’s a $600 gap. Six hundred dollars. Twelve months of TrainerRoad. A high-end helmet. A very decent wheelset upgrade sitting right there on the table.

Frustrated by the vague marketing language on both company websites, I built a literal spreadsheet — color-coded, embarrassingly detailed — comparing every listed feature side by side. What did I actually find? Both measure dual-sided power. Both give you cadence, total power, and left/right balance. The Rally throws in running dynamics for triathletes — a feature that matters to roughly zero percent of pure road cyclists — and hooks more tightly into Garmin Connect. That’s it. That’s the short list.

The Assioma counters with rechargeable batteries, a lighter pod at 71 grams per pedal versus the Rally’s 95 grams, and that $600 still sitting in your account doing nothing except making you feel better about life.

• Favero Assioma Duo — ~$599 USD, 71g per pedal, rechargeable via magnetic cable
• Garmin Rally RS200 — $1,199.99 USD, 95g per pedal, replaceable CR2032 batteries
• Both offer dual-sided power measurement and +/- 1% claimed accuracy
• Rally supports SPD-SL, Look, and SPD cleats depending on variant; Assioma uses proprietary Favero cleats based on Look Kéo

Whether that gap is justified comes down entirely to your ecosystem and how much those extra features factor into your actual riding life. Not your hypothetical riding life. Your actual one.

Accuracy and Consistency in Real Riding

Both Garmin and Favero claim +/- 1% accuracy. On paper — identical. But what is real-world accuracy? In essence, it’s how closely your pedals track against a laboratory-grade reference meter under actual riding conditions. But it’s much more than that — it’s also how consistent that tracking stays across temperature swings, long efforts, and months of daily use.

Early on, I assumed matching spec sheets meant matching real performance. Don’t make my mistake. The more honest data comes from long-term user reports and DCRainmaker’s testing — probably the most rigorous independent review resource in cycling tech — which has repeatedly shown the Assioma Duo tracking within fractions of a percent against Quarq and SRM reference meters. The Rally RS200 also performs well, though several long-term users report noticeable temperature sensitivity below 5°C. Extended winter rides, particularly — the kind I was doing in February on roads with no good reason to be outside — showed mild drift on the Rally in conditions where the Assioma stayed stable.

Calibration matters here. Both pedals benefit from a zero-offset before rides, especially after moving between warm and cold environments. The Assioma handles this automatically through the app — no rider input required. The Rally needs a manual zero-offset through your Garmin head unit. Four seconds, sure. But four seconds you’ll eventually forget, usually before your most important interval session of the week.

Left/Right Balance Data

Both systems capture true left/right balance — actual strain gauge data from each pedal independently, not an estimated or extrapolated figure. That distinction matters enormously for riders working through asymmetry or returning from injury. My own data showed a persistent 52/48 left-heavy split I’d had absolutely no idea about. That single discovery justified the cost of entry for me before I’d even finished the first training block.

Bottom line on accuracy: both are excellent. Neither will fail you for training or racing. If sub-0.5% precision in freezing temperatures is a genuine priority, the Assioma edges ahead based on real-world evidence rather than spec sheet promises.

Battery Life and Maintenance

Probably should have opened with this section, honestly. Battery logistics are the unglamorous detail that shapes your daily experience with these pedals more than any other spec — and nobody leads with it in their marketing copy.

The Favero Assioma Duo uses integrated rechargeable lithium batteries with a claimed 50-hour life. In practice, I consistently landed between 45 and 52 hours depending on whether Bluetooth stayed active during rides. Charging happens on-pedal via a proprietary magnetic cable — not USB-C, which I somehow assumed when I bought them, which was a mildly annoying discovery at 10pm the night before a long ride. Full charge takes about 2.5 hours from flat. The cables snap magnetically to contacts on the back of each pod. Clean enough, once you accept the proprietary situation.

The Garmin Rally RS200 runs on CR2032 coin cells — 120 claimed hours per set, replaceable batteries available at every pharmacy, gas station, and airport convenience store on earth. No charging cable. No planning around charge cycles before an event.

That’s what makes the Rally’s battery approach endearing to us frequent travelers. I’ve been in a hotel in Portugal at 11pm with dead power meter batteries and zero charging options — a situation where swapping a $2 coin cell would have taken thirty seconds. The Rally’s approach would have saved me an actual minor panic. The Assioma’s approach works perfectly until the one moment it doesn’t, and that moment always seems to happen abroad.

• Assioma Duo — 50-hour rechargeable, proprietary magnetic cable, charges on-pedal
• Rally RS200 — 120-hour replaceable CR2032, available universally
• Long-term CR2032 cost over three years of regular riding stays under $20 total
• Assioma battery replacement when cells eventually degrade requires sending pedals back to Favero — worth factoring into five-plus year ownership plans

App Ecosystem and Data

This is where the two companies exist in genuinely different worlds — and where the Rally’s premium price finds its strongest justification, assuming you already live in the Garmin universe.

The Garmin Rally connects to Garmin Connect — a mature, feature-rich platform built around deep integration with the entire Garmin product line. Garmin Edge 530, 830, or 1040 on your bars? The Rally pairs with zero friction. Power, cadence, left/right balance, platform center offset, pedal smoothness — everything flows directly to your head unit and surfaces cleanly in Garmin Connect’s long-term trend analysis. If you’ve already bought into Garmin across multiple devices, the experience is genuinely seamless.

The Favero Assioma app is functional but sparse — mostly a utility for firmware updates and calibration checks rather than a place you actually spend time with your data. But here’s the thing: the Assioma broadcasts over both ANT+ and Bluetooth simultaneously. That means it works with everything. Zwift, TrainerRoad, Wahoo ELEMNT, Garmin head units, Polar, Suunto — simultaneously, without conflicts. I tested it personally with TrainerRoad on an iPad and a Wahoo ELEMNT Bolt capturing the same ride at the same time. Zero dropouts across the entire session.

Zwift and TrainerRoad Compatibility

Both pedals work flawlessly with Zwift and TrainerRoad via Bluetooth or ANT+. No caveats whatsoever. The Rally’s advantage lives exclusively in deeper Garmin Connect integration for riders already consolidated in that ecosystem — and that advantage disappears entirely the moment you put a Wahoo on your bars. Strava gets the data either way through automatic sync. Power data appears in Strava identically regardless of which pedal sourced it. The platform doesn’t know and doesn’t care.

The Verdict — Who Should Buy Which

After running both systems across a full 12-week base period — not a two-week review window but an actual training block through February and March conditions that I wouldn’t wish on anyone — here’s where I landed.

I kept asking the same question the entire time: what does the $600 Rally premium actually change about my training? The honest answer, for most riders, is not much.

Buy the Favero Assioma Duo if:

• You use a Wahoo, Polar, or any non-Garmin head unit
• You train primarily on Zwift or TrainerRoad without needing deep Garmin Connect integration
• You want the best accuracy-per-dollar ratio available in pedal-based power meters right now
• You prefer rechargeable batteries and a setup that never involves a pharmacy run
• You ride Look Kéo cleats or are willing to switch — the Assioma runs a Kéo-compatible system

Buy the Garmin Rally RS200 if:

• You’re deeply embedded in Garmin Connect across multiple Garmin devices
• You do triathlons and actually want running dynamics from the same pedals
• You travel frequently and want universally replaceable batteries over rechargeable convenience
• You ride SPD-SL cleats and have no interest in changing that
• Budget genuinely isn’t a constraint and you want Garmin’s warranty and support infrastructure behind you

The Assioma Duo wins for most cyclists — not because the Rally is bad, but because $599 buys you accuracy that matches or beats the Rally in most real conditions, a lighter pedal, universal ecosystem compatibility, and $600 still in your pocket. That money buys a lot of other things that will actually move your fitness forward.

The Rally makes sense if you’re a Garmin loyalist — Edge 1040 on the bars, Instinct on the wrist, never touched a Wahoo in your life. The integration is genuinely excellent. The build quality is excellent. You’re essentially paying for full membership in a complete ecosystem, and if you’re already there, that membership has real value.

Everyone else: put the Assioma Duo in your cart, bank the difference, and drop it on a proper bike fit or a coaching plan. That investment will do more for your actual power numbers than any pedal brand loyalty ever will.