4iiii Precision 3+ Power Meter
The 4iiii Precision 3+ is positioned as the best value bottom bracket integrated power meter, offering a compact, low-weight single-sided spindle solution that upgrades many popular cranks at a lower price point than rivals. It stands out for long battery life and simple ANT+/Bluetooth connectivity, making it a financially attractive option compared with the dual-leg, higher-cost offerings like Rotor or SRAM which prioritize bilateral data and broader OEM integration. For riders who want accurate core power data without the premium for dual-sided measurement or race-weight components, the Precision 3+ is a pragmatic choice.
Pinpoint accuracy
Long battery life
Pinpoint accuracy
Long battery life
Review Summary
"Users praise the 4iiii Precision 3+ for consistent, accurate power readings, easy wireless pairing and good battery life, though occasional firmware or connectivity quirks are reported."
Small but mighty
Single-leg spindle option providing accurate left-only power readings for a lower cost.
Small but mighty
Single-leg spindle option providing accurate left-only power readings for a lower cost.
Enhanced Physical Well-Being
Skill Development & Mastery
The 4iiii Precision 3+ is positioned as the best value bottom bracket integrated power meter, offering a compact, low-weight single-sided spindle solution that upgrades many popular cranks at a lower price point than rivals. It stands out for long battery life and simple ANT+/Bluetooth connectivity, making it a financially attractive option compared with the dual-leg, higher-cost offerings like Rotor or SRAM which prioritize bilateral data and broader OEM integration. For riders who want accurate core power data without the premium for dual-sided measurement or race-weight components, the Precision 3+ is a pragmatic choice.
Pinpoint accuracy
Long battery life
Small but mighty
Single-leg spindle option providing accurate left-only power readings for a lower cost.
ANT+ and Bluetooth Smart connectivity for head unit and smartphone pairing.
Pinpoint accuracy
Long battery life
Small but mighty
Single-leg spindle option providing accurate left-only power readings for a lower cost.
ANT+ and Bluetooth Smart connectivity for head unit and smartphone pairing.
$350-450 USD
Rotor INpower DM Road
The Rotor INpower DM Road claims the market-leader technical position by providing true dual-leg measurement and advanced pedal-balance analytics in a bottom bracket spindle, delivering richer training metrics than single-sided units such as the 4iiii or some Easton variants. While typically priced higher, its bilateral accuracy and high sampling rate make it a stronger option for power-centric athletes and coaches who need left/right insight that cheaper spindles cannot supply. Compared to lighter, race-focused spindles, Rotor trades some grams for superior data fidelity and tuning capability.
Dual-sided data
Lightweight build
Dual-sided data
Lightweight build
Review Summary
"Riders appreciate the Rotor INpower DM Road for its dual-sided accuracy and detailed left/right metrics with solid build quality, but some note added weight and occasional setup or compatibility headaches."
Left-right whisperer
Dual-sided measurement built into a direct-mount road spindle for high-precision power and balance data.
Left-right whisperer
Dual-sided measurement built into a direct-mount road spindle for high-precision power and balance data.
Enhanced Physical Well-Being
Skill Development & Mastery
The Rotor INpower DM Road claims the market-leader technical position by providing true dual-leg measurement and advanced pedal-balance analytics in a bottom bracket spindle, delivering richer training metrics than single-sided units such as the 4iiii or some Easton variants. While typically priced higher, its bilateral accuracy and high sampling rate make it a stronger option for power-centric athletes and coaches who need left/right insight that cheaper spindles cannot supply. Compared to lighter, race-focused spindles, Rotor trades some grams for superior data fidelity and tuning capability.
Dual-sided data
Lightweight build
Left-right whisperer
Dual-sided measurement built into a direct-mount road spindle for high-precision power and balance data.
Road direct-mount crank compatibility with adapters for common systems.
Dual-sided data
Lightweight build
Left-right whisperer
Dual-sided measurement built into a direct-mount road spindle for high-precision power and balance data.
Road direct-mount crank compatibility with adapters for common systems.
$1200-1500 USD
Easton EC90 SL Spindle Power Meter
The Easton EC90 SL Spindle Power Meter targets racers who prioritize weight and stiffness, integrating power measurement into an ultralight spindle that competes on performance-to-weight with high-end crank-focused systems. It is often favored over heavier dual-leg solutions when marginal grams and rigidity matter, though it typically lacks the bilateral analytics of Rotor and the broader compatibility of SRAM DUB spindles. Financially, it appeals to riders willing to pay a premium for low mass and race-ready hardware rather than the most feature-rich measurement suite.
Featherweight spindle
Aero-friendly design
Featherweight spindle
Aero-friendly design
Review Summary
"Reviewers like the Easton EC90 SL spindle for its extremely light, aero-focused design, but many report inconsistent data, limited software/support and some long-term reliability concerns."
Pro-level precision
Carbon spindle design focused on minimal weight for climbing and performance-oriented setups.
Pro-level precision
Carbon spindle design focused on minimal weight for climbing and performance-oriented setups.
Enhanced Physical Well-Being
Skill Development & Mastery
The Easton EC90 SL Spindle Power Meter targets racers who prioritize weight and stiffness, integrating power measurement into an ultralight spindle that competes on performance-to-weight with high-end crank-focused systems. It is often favored over heavier dual-leg solutions when marginal grams and rigidity matter, though it typically lacks the bilateral analytics of Rotor and the broader compatibility of SRAM DUB spindles. Financially, it appeals to riders willing to pay a premium for low mass and race-ready hardware rather than the most feature-rich measurement suite.
Featherweight spindle
Aero-friendly design
Pro-level precision
Carbon spindle design focused on minimal weight for climbing and performance-oriented setups.
Accurate power data with ANT+ and Bluetooth Smart connectivity to head units and apps.
Featherweight spindle
Aero-friendly design
Pro-level precision
Carbon spindle design focused on minimal weight for climbing and performance-oriented setups.
Accurate power data with ANT+ and Bluetooth Smart connectivity to head units and apps.
$700-900 USD
Race Face Next SL G5 Cinch Power Meter Spindle
The Race Face Next SL G5 Cinch Power Meter Spindle is built for off-road riders who need a durable, serviceable power solution compatible with the Cinch system, offering a strong value proposition for mountain bikers compared with road-centric spindles. Its rugged construction and trail-focused tuning make it a better technical and financial fit for MTB use than lightweight road-only units like the Easton EC90 SL, while still delivering reliable power data that rivals pricier dual-leg systems in robustness if not in bilateral detail. For riders who demand durability and compatibility with Race Face ecosystems, the Next SL G5 balances cost and performance.
Trail-tough durability
Cinch-ready fit
Trail-tough durability
Cinch-ready fit
Review Summary
"The Race Face Next SL G5 Cinch power meter spindle is lauded for low weight, accurate readings and smooth Cinch-system integration, though a minority of users experience intermittent connectivity or calibration issues."
Dust-proof confidence
Designed for Cinch crank systems common on mountain bikes, integrating power measurement into the spindle.
Dust-proof confidence
Designed for Cinch crank systems common on mountain bikes, integrating power measurement into the spindle.
Recreational Enjoyment
Enhanced Physical Well-Being
Skill Development & Mastery
The Race Face Next SL G5 Cinch Power Meter Spindle is built for off-road riders who need a durable, serviceable power solution compatible with the Cinch system, offering a strong value proposition for mountain bikers compared with road-centric spindles. Its rugged construction and trail-focused tuning make it a better technical and financial fit for MTB use than lightweight road-only units like the Easton EC90 SL, while still delivering reliable power data that rivals pricier dual-leg systems in robustness if not in bilateral detail. For riders who demand durability and compatibility with Race Face ecosystems, the Next SL G5 balances cost and performance.
Trail-tough durability
Cinch-ready fit
Dust-proof confidence
Designed for Cinch crank systems common on mountain bikes, integrating power measurement into the spindle.
Sturdy construction for trail use with ANT+ and Bluetooth Smart transmission.
Trail-tough durability
Cinch-ready fit
Dust-proof confidence
Designed for Cinch crank systems common on mountain bikes, integrating power measurement into the spindle.
Sturdy construction for trail use with ANT+ and Bluetooth Smart transmission.
$450-650 USD
SRAM DUB Power Meter Spindle
The SRAM DUB Power Meter Spindle leverages SRAM's extensive drivetrain ecosystem to offer wide compatibility with DUB cranks and reliable integration with Quarq-derived power technology, giving it an OEM-friendly advantage over standalone aftermarket spindles. It typically appeals to riders who value seamless fitment, robust service networks, and consistent firmware/support that undercut the integration headaches seen with some third-party options, though it may sit at a premium relative to budget-focused units like 4iiii. Compared to Rotor's bilateral emphasis or Easton's race-weight focus, SRAM's DUB spindle is a balanced choice for riders seeking compatibility and brand-level support.
Wide compatibility
Robust accuracy
Wide compatibility
Robust accuracy
Review Summary
"Users rate the SRAM DUB power meter spindle highly for dependable, consistent accuracy, straightforward installation and strong support, with most complaints focused on cost rather than performance."
Plug-and-play vibe
Made to fit SRAM DUB crank standards as a direct spindle replacement for integrated power measurement.
Plug-and-play vibe
Made to fit SRAM DUB crank standards as a direct spindle replacement for integrated power measurement.
Time-Saving Convenience
Enhanced Physical Well-Being
Skill Development & Mastery
The SRAM DUB Power Meter Spindle leverages SRAM's extensive drivetrain ecosystem to offer wide compatibility with DUB cranks and reliable integration with Quarq-derived power technology, giving it an OEM-friendly advantage over standalone aftermarket spindles. It typically appeals to riders who value seamless fitment, robust service networks, and consistent firmware/support that undercut the integration headaches seen with some third-party options, though it may sit at a premium relative to budget-focused units like 4iiii. Compared to Rotor's bilateral emphasis or Easton's race-weight focus, SRAM's DUB spindle is a balanced choice for riders seeking compatibility and brand-level support.
Wide compatibility
Robust accuracy
Plug-and-play vibe
Made to fit SRAM DUB crank standards as a direct spindle replacement for integrated power measurement.
Provides accurate power output with ANT+ and Bluetooth Smart connectivity; available in single- or dual-sided options depending on model.
Wide compatibility
Robust accuracy
Plug-and-play vibe
Made to fit SRAM DUB crank standards as a direct spindle replacement for integrated power measurement.
Provides accurate power output with ANT+ and Bluetooth Smart connectivity; available in single- or dual-sided options depending on model.
$500-700 USD