10 Best Power Meters For Shimano 105 In 2026: Accurate, Easy-To-Install Picks For Every Rider

If you ride Shimano 105 and want better training data, a power meter is one of the smartest upgrades you can make. It helps you pace climbs, structure workouts, and track real progress with every ride.

The best option depends on your goals, crank compatibility, and whether you want the simplest install or the most flexible setup.

Best 10 Power Meter for Shimano 105 Picks for 2026

Best Left-Side Upgrade – 4iiii Precision 3+ for Shimano 105

If you want a straightforward power meter for Shimano 105, the 4iiii Precision 3+ is a practical left-side option that adds watts, cadence, and calorie tracking without a full drivetrain overhaul. It’s a strong fit for riders who want reliable training data, ANT+ compatibility, and an easy way to get started with power-based riding.

Best For: Shimano 105 riders who want an affordable, easy-to-install left-crank power meter for training.

Pros:

• Left-side design keeps setup simpler than dual-sided systems
• Tracks watts, cadence, and calories for training insight
• ANT+ support works well with many head units and apps
• Apple Find My compatibility adds extra peace of mind

Cons:

• Measures only one side, so it estimates total power
• Not the best choice if you want advanced dual-leg balance data

For riders searching for a dependable power meter for Shimano 105, this 4iiii model hits a smart balance of ease, compatibility, and training value. It’s especially appealing if you want accurate-enough power data without paying for a more complex upgrade.

Best for Easy Setup – Favero Assioma Uno Power Meter Pedal

If you want a power meter for Shimano 105 that’s simple to add to your bike without replacing your whole crankset, the Favero Assioma Uno is a smart pedal-based option. It pairs easy installation with reliable Bluetooth and ANT+ connectivity, plus rechargeable battery life that suits regular training and endurance rides.

Best For: Riders who want a straightforward, pedal-based power meter with low maintenance and quick setup.

Pros:

• Easy to install and move between compatible bikes
• Rechargeable battery delivers up to 50 hours per charge
• Works with Bluetooth and ANT+ bike computers and smartphones
• Single-sided design keeps the entry cost lower than dual-sided systems

Cons:

• Measures power from the left pedal only in the UNO version
• Pedal-based design may not be ideal if you prefer crank-based meters

For Shimano 105 riders who value convenience, the Assioma Uno is an easy way to add power data without a complicated install. It’s a practical power meter for Shimano 105 setups when you want accurate training metrics, strong battery life, and a clean user experience.

Best for Shimano SPD-SL Compatibility – Garmin Rally RS100 Power Pedals

If you want a dependable power meter for Shimano 105 road pedals, the Garmin Rally RS100 is a straightforward way to add accurate power and cadence tracking without changing your riding style. It installs like a normal pedal, uses Shimano SPD-SL cleats, and gives you a clean upgrade path if you later want dual-sided data.

Best For: Road cyclists using Shimano 105 or other SPD-SL setups who want easy installation, transferability, and a reliable entry into power-based training.

Pros:

• Compatible with Shimano SPD-SL cleats for a familiar road-cycling fit
• Single-sensing design keeps setup simple while still tracking power and cadence
• Easy to move between bikes, making it useful for riders with multiple setups
• Upgradeable to dual-sensing later if you want more advanced metrics

Cons:

• Measures from the left pedal only, so it is less detailed than dual-sided systems
• Pricier than basic training sensors if you only need simple data
• Designed around road cleats, so it is not the best fit for non-SPD-SL riders

Overall, the Rally RS100 is a smart power meter for Shimano 105 riders who value easy setup, trusted Garmin ecosystem support, and room to grow. If you want a no-fuss way to start training with power, it’s a strong, practical choice.

Best for Long Ride Data – Magene PES P505/P515 Power Meter Crankset

If you want a power meter for Shimano 105-style training on a budget-friendly complete crankset, the Magene PES P505/P515 is built for accurate, everyday performance. It pairs ±1% power data with Bluetooth/ANT+ support, long battery life, and an easy-to-install 110BCD design for riders who want reliable training metrics without a complicated setup.

Best For: Road cyclists who want a complete crank-based power meter with strong accuracy, long battery life, and simple app/computer compatibility.

Pros:

• ±1% claimed accuracy with strain gauges, acceleration sensors, and temperature compensation
• Very long 380-hour battery life for frequent training and endurance rides
• Bluetooth and ANT+ connectivity works with popular bike computers and training apps
• IPX7 waterproofing and a pre-assembled crankset make setup straightforward

Cons:

• Not the lightest or most established option compared with top-tier crank-based systems
• 110BCD compatibility may require checking chainring and drivetrain fit before buying

This is a strong choice if you need a dependable power meter for Shimano 105-type road training and care most about accuracy, battery life, and a complete crankset design. It is especially appealing for riders who want solid data for structured workouts without paying for a more expensive premium brand.

Best for Easy Transfer Between Bikes – Garmin Rally RS110 Power Meter Pedals

If you want a practical power meter for Shimano 105-style road setups, the Garmin Rally RS110 is a pedal-based option that installs like a standard SPD-SL pedal and moves easily between bikes. It delivers single-sided power and cadence data with Garmin’s newer sensing tech, plus rechargeable convenience for riders who don’t want to fuss with coin cells.

Best For: Road cyclists who want an easy-to-transfer, Shimano SPD-SL-compatible power meter with reliable training data and a straightforward install.

Pros:

• Fits Shimano SPD-SL cleats and installs like a normal road pedal
• Single-sensing design tracks total power and cadence with +/- 1% accuracy
• Rechargeable battery offers up to 90 hours of ride time
• Pedal IQ calibration alerts help keep readings consistent

Cons:

• Single-sided measurement won’t provide left/right balance data
• Higher price than many basic crank-based options
• Best suited to riders already using SPD-SL road pedals

Overall, the Rally RS110 is a smart pick if you want a power meter for Shimano 105 training use without replacing your whole crank or juggling complicated installation. It’s especially appealing for riders who switch bikes often and want accurate, easy-to-read power data in a pedal-based format.

Best Shimano SPD-SL Upgrade – Favero Assioma Duo-Shi Power Meter

If you want a reliable power meter for Shimano 105-style road riding, the Favero Assioma Duo-Shi is a strong route if you’re already using Shimano SPD-SL pedal bodies. It measures power on both sides, pairs easily with modern bike computers, and keeps accuracy stable even when your pedal stroke gets messy during climbs, sprints, or oval-chainring efforts.

Best For: Riders who want a dual-sided, pedal-based power upgrade and already own compatible Shimano SPD-SL pedals.

Pros:

• Dual-sided measurement for more complete left/right power data
• ±1% accuracy and solid performance in real-world riding conditions
• Bluetooth and ANT+ support for bike computers and smartphones
• Compatible with several Shimano SPD-SL pedal bodies, including PD-R7000 and PD-R8000

Cons:

• Does not include pedal bodies, so you need compatible Shimano pedals already
• Higher upfront cost than simpler single-sided options

For riders focused on training quality, this is a smart power meter for Shimano 105 setups that want accurate dual-sided data without switching away from a Shimano pedal feel. The included multitool is a nice bonus, but the real value is the dependable power readings and easy compatibility with common cycling head units.

Best Easy-Transfer Pedal Meter – Garmin Rally RS110 for Shimano SPD-SL

If you want a power meter for Shimano 105 that’s simple to install, easy to move between bikes, and built for road training precision, the Garmin Rally RS110 is a strong fit. It uses a single-sensing pedal design to measure total power and cadence, while staying compatible with Shimano SPD-SL cleats for a familiar road feel.

Best For: Road riders who want reliable power data, quick bike-to-bike transfer, and a pedal-based setup that works well with Shimano SPD-SL systems.

Pros:

• Easy pedal-style installation and transfer between bikes
• Single-sensing power and cadence with +/- 1% claimed accuracy
• Rechargeable design with up to 90 hours of ride time
• Pedal IQ smart calibration helps reduce guesswork

Cons:

• Single-sided measurement won’t show left/right balance
• Higher-priced than basic crank-based options
• Requires Shimano SPD-SL cleats for road use

For riders comparing a power meter for Shimano 105, the Rally RS110 stands out because it combines accuracy, convenience, and upgrade flexibility in a pedal-based format. It’s especially appealing if you value easy swapping between bikes more than the absolute lowest price.

Best Dual-Sensing Upgrade – Garmin Rally RS210 Shimano SPD-SL Power Meter Pedals

If you want a power meter for Shimano 105-compatible road setups and prefer pedal-based convenience, the Garmin Rally RS210 is a high-end option that keeps installation simple while delivering detailed ride data. It uses Shimano SPD-SL cleats, offers dual-sensing power measurement, and includes a rechargeable design with long battery life.

Best For: Road cyclists who want precise dual-sided power data, easy swap-friendly pedals, and a premium training upgrade for Shimano SPD-SL shoes.

Pros:

• Dual-sensing design captures left/right power balance and richer cycling metrics.
• Shimano SPD-SL cleat compatibility fits many road riders moving from Shimano-style setups.
• Rechargeable battery with up to 90 hours of ride time supports long training blocks.
• Pedal-based system is easier to move between bikes than many crank-based options.

Cons:

• Premium pricing puts it above entry-level power meters.
• Requires SPD-SL shoes and cleats, so it is not ideal for every bike fit or pedal preference.

For riders comparing a power meter for Shimano 105, this is a strong choice if you value portability, accurate dual-sided data, and a straightforward pedal swap rather than a crank-based setup.

Best Off-Road Pick – Garmin Rally XC110 SPD Power Meter Pedals

If you want a power meter for Shimano 105-era training goals but ride gravel, XC, or cyclocross more than the road, the Garmin Rally XC110 is a strong pedal-based option. It installs like standard pedals, uses Shimano SPD cleats, and gives you total power and cadence in a format that is easy to move between bikes.

Best For: Riders who want an off-road power meter with Shimano SPD compatibility, quick bike swaps, and Garmin training features.

Pros:

• SPD-compatible off-road pedals make setup straightforward for gravel and XC bikes
• Single-sensing system tracks total power and cadence with claimed +/- 1% accuracy
• Rechargeable design offers up to 90 hours of ride time
• Pedal IQ calibration reminders help keep data consistent

Cons:

• Single-sided measurement is less detailed than dual-sensing systems
• More expensive than many crank-based entry options
• Not the most direct fit if you only ride road with Shimano 105

This is a smart pick if you need a power meter for Shimano 105 training structure but your actual riding happens off-road. It is especially appealing for riders who want Garmin ecosystem features and pedal-based convenience without giving up SPD compatibility.

Best for Off-Road Shimano SPD – Garmin Rally XC210 SPD Power Meter Pedals

If you want a pedal-based power meter for Shimano 105 training plans but ride gravel, cyclocross, or trail bikes too, the Garmin Rally XC210 is built for that crossover use. It installs like a normal pedal, works with Shimano SPD cleats, and adds dual-sensing power data for riders who want deeper metrics and easy bike-to-bike swapping.

Best For: Riders who need accurate off-road power data, Shimano SPD compatibility, and a pedal system that can move between bikes.

Pros:

• Dual-sensing design captures left/right balance and other cycling dynamics
• Shimano SPD compatibility makes it a strong fit for off-road pedal setups
• Rechargeable battery delivers up to 90 hours of ride time
• All-metal pedal bodies improve durability and clearance on rough terrain

Cons:

• More specialized than a simple road power meter
• Requires compatible Garmin devices to get the full data set
• Premium price compared with basic single-sided options

For riders comparing a power meter for Shimano 105, this is less about a pure road-race setup and more about getting accurate, transferable power data in an off-road package. The XC210 stands out if your riding includes gravel or MTB and you want advanced metrics without giving up SPD pedals.

How We Picked These Power Meter for Shimano 105 Options

We focused on models that make sense for riders upgrading Shimano 105 bikes, including left-side crank arms, pedal-based systems, and crankset-based units. Priority went to accuracy, reliability, installation ease, app support, battery life, and overall value for training and racing.

We also favored choices that fit different use cases: riders who want the easiest swap, riders who may move the meter between bikes, and riders who want dual-sided data or off-road compatibility.

Quick Comparison

In simple terms, crank-arm meters are usually the most affordable and clean-looking fit for a Shimano 105 bike, while pedal-based power meters are the easiest to transfer between bikes. Dual-sided pedal systems add more detailed balance and pedaling metrics, but they cost more. If you ride road and want SPD-SL compatibility, look closely at pedal systems designed for Shimano-style road cleats.

Key Buying Factors for a Power Meter for Shimano 105

Compatibility

Make sure the meter works with your exact Shimano 105 setup. Some options replace only the left crank arm, some replace the full crankset, and others use pedals that are independent of the drivetrain. Check spindle, chainring, and pedal standards before buying.

Accuracy and Data Usefulness

Most riders should look for accuracy in the 1% to 2% range. If you train with structured intervals or use power-based coaching, consistency matters more than chasing extra features you will never use.

Installation and Transferability

If you only ride one bike, a crank-based meter can be a great fit. If you switch bikes often, pedal-based systems are usually easier to move. Consider whether you want a rechargeable battery, coin-cell convenience, or a factory-installed ride-ready setup.

Road or Off-Road Cleat System

Road riders using Shimano 105 typically want SPD-SL-compatible pedals. Gravel and mountain riders should look at SPD-compatible off-road options instead. Choosing the wrong cleat system can make a good power meter a poor match for your riding.

Who Should Buy Which Power Meter for Shimano 105?

Choose a left-side crank meter if you want the best value and a tidy install. Pick a pedal-based meter if you care most about easy transfer between bikes and fast setup. Go dual-sided if you want more complete data and are willing to pay for it. Riders moving beyond road use should consider Shimano SPD-compatible off-road models, while budget-focused buyers can often get excellent training value from a simpler single-sensing option.

For most riders, the best Power Meter for Shimano 105 is the one that fits your bike standard, matches your cleat system, and gives you the data you will actually use consistently.