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Best-value power meters: brand-listed prices by type
Pedal, crank arm, spindle and spider power meters by brand-listed US price, sides measured, battery, and what the spare parts cost.
At a glance
Who it's for: riders buying a first power meter, or a second for another bike, who want to know what each type costs to buy and to keep running before a deal turns up.
Short answer: The cheapest way in is a left-side meter that matches the crank you already have: SRAM's Rival AXS upgrade has the lowest brand-listed price in this table ($195 or $290 MSRP), and 4iiii lists a Shimano 105 crank arm meter at $349.99. A single-sided meter measures one leg and doubles it. If you want both legs or ride several bikes, Favero's Assioma DUO ($499, Look Keo) is the lowest-priced dual-sided pedal here.
The four types in brief
- Pedal. The sensor sits in the pedal spindle. You move it to another bike with a pedal wrench, which is the main appeal. You are tied to that pedal's cleat system.
- Crank arm. A sensor bonded to the left crank arm (single-sided) or both arms. It has to match your crankset model and arm length.
- Spindle. The sensor sits inside the crank spindle. SRAM's Rival AXS unit, below, is one.
- Spider. The sensor sits between the crank and the chainrings and measures the combined output of both legs there. It has to match your crank interface and chainring bolt pattern.
A single-sided meter measures one leg and doubles it. SRAM says its Rival unit "measures left side power to calculate total watts". If your legs are not evenly matched, the doubled number will not be your real total. A dual-sided meter measures both legs.
Brand-listed prices, lowest first
| Product | Type | Measures | US price listed by the brand | Battery (brand figure) | Claimed accuracy |
|---|---|---|---|---|---|
| SRAM Rival AXS Power Meter Upgrade PM-RIV-ASSY-E1 | Spindle | Left side, doubled | $195 (MSRP) | "400+ hours", user-replaceable AAA lithium | Not stated |
| SRAM Rival AXS Power Meter Upgrade PM-RIV-ASSY-D1 | Spindle (DUB-PWR) | Left side, doubled | $290 (MSRP) | "400+ hours", user-replaceable AAA lithium | Not stated |
| Magene PES P515 Power Meter Set | Spider, sold as a complete crankset (arms, 24 mm spindle, 110BCD 4-bolt; chainrings optional) | Both legs combined | $299 (Magene's own store, priced in USD) | 380 hours in the spec table, 330 in the FAQ (see below); magnetic charging | ±1% |
| 4iiii PRECISION 3+ Left-Side, Ride Ready | Crank arm | Left side, doubled | $349.99 (105 FC-R7100), $399.99 (GRX RX810/RX820) (checked 6 October 2026) | Up to 800 hours, CR2032 coin cell | ±1% |
| Stages Power L, Shimano 105 R7100 | Crank arm | Left side, doubled | $354.99 | "200+ hours", CR2032 coin cell | ±1.5% |
| Favero Assioma UNO (first generation, Look Keo) | Pedal | Left side, doubled | $399 | "50+ hours per charge" | ±1% |
| Favero Assioma DUO (first generation, Look Keo) | Pedal | Both legs | $499 | "50+ hours per charge" | ±1% |
| Favero Assioma PRO RS-1 / RL-1 / MX-1 | Pedal | One side, doubled | $499 | "Up to 160 hours per charge" | ±1% |
| Garmin Rally RS110 (also RK110, XC110) | Pedal | One side, doubled | $599.99 | Up to 90 hours, rechargeable | ±1% |
| Wahoo SPEEDPLAY POWER Single | Pedal | Left side, doubled | $599.99 | "Up to 75 hours" | ±1% |
| Look Keo Blade Power Single | Pedal | Left side, doubled | $600 (checked 6 October 2026) | 60 hours, rechargeable | Not stated on the Single page |
| Favero Assioma PRO RS-2 / RL-2 / MX-2 | Pedal | Both legs | $789 | "Up to 160 hours per charge" | ±1% |
| Wahoo SPEEDPLAY POWER Dual | Pedal | Both legs | $849.99 | "Up to 75 hours" | ±1% |
| Garmin Rally RS210 (also RK210, XC210) | Pedal | Both legs | $899.99 | Up to 90 hours, rechargeable | ±1% |
| Look Keo Blade Power Dual | Pedal | Both legs | $900 (checked 6 October 2026) | 60 hours, rechargeable | "around 1%" |
| SRM X-Power Road | Pedal (SPD-SL) | Both legs, or one on the single version | $1,699 dual, $1,399 single | 30 hours, magnetic charger | ±2% |
What each one costs to keep running
This is where list prices hide differences. All figures are from the brands' own spare-parts and accessories pages on 26 September 2026.
Favero Assioma PRO (RS spares, RL spares, MX spares). A pair of pedal bodies is $130, a single body $67. Favero pitches this as a feature: "you can keep the same spindle and swap the pedal body". A USB-C cable is $17, a set of magnetic USB-C connectors $33 and a repair kit $33. Favero's SPD-SL cleats are $10, and Favero lists Shimano SM-SH10, SM-SH11 and SM-SH12 as compatible with the RS. A replacement sensor is $396. The single-sided PRO can be upgraded to dual for $489, so a -1 plus the upgrade is $988, against $789 for a -2 bought outright.
Favero Assioma, first generation (spares). Magnetic connector $27, battery charger $33, replacement sensor $286. The UNO-to-DUO upgrade is $389, so UNO plus upgrade is $788 against $499 for the DUO.
Garmin Rally (conversion kit). Garmin's US store lists the RS (SPD-SL) Pedal Body Conversion Kit at $149.99 and the XC (SPD) kit at $249.99. The RK (Look Keo) version showed no price when we checked. Garmin lists the contents as "Two Rally™ RK/RS/XC pedal bodies (depending on the version selected), Cleats, Hardware, Documentation". A Rally Charging Adapter is $24.99, and a Dual-sensing Upgrade Spindle that turns a single-sided set into dual is $549.99. That makes RS110 plus upgrade $1,149.98, against $899.99 for the RS210. RS replacement cleats and RK 6° float cleats are $24.99 each, and the RK 110/210 Pedal Rebuild Kits are $99.99 per side.
Look Keo Blade Power (power accessories). Look's US store lists the Power Charger at $35, a charging cable at $21 and a Blades kit at $55 (checked 19 October 2026). It did not list a replacement Keo Blade Power pedal body, the power bearings kit or the Instrumented Power Axle when we checked on 19 October 2026. Look's UK store lists the axle at £450.00, as "Compatible with Keo Blade Power and X-Track Power". Keo Grip cleats are $28.
Wahoo SPEEDPLAY POWER. Replacement cleats are $59.99 (Standard or Easy Tension). A charging kit is $24.99 and a spacer and screw set $18.99.
SRM X-Power Road. SPD-SL cleats, a charge cable and two charge clips come in the box. A replacement X-Power Pedal Charger (magnetic adapter plus micro-USB cable) is $35 on SRM's US store.
Crank arm and spindle meters. These run on replaceable batteries, so there is no charger to lose. 4iiii sells a maintenance kit (battery cap and O-ring) for $14.99. Stages sells a replacement battery door for Gen 2 and Gen 3 left-side meters at $9.99. SRAM uses a user-replaceable AAA lithium battery.
Magene P515. The $299 price is for the version without chainrings, so budget for a set. Magene's QED Lightweight Split Chainring is $75, or you can use your own 110BCD 4-bolt rings.
Which type fits which rider
- One road bike with a Shimano 105 crank. A left-side crank arm meter from 4iiii ($349.99 for the 105 FC-R7100, checked 6 October 2026) or Stages ($354.99) replaces your left arm. Check the exact crank model and arm length.
- SRAM AXS with a DUB crank. SRAM's Rival AXS upgrade is the lowest brand-listed price in this table ($195 or $290 MSRP). It measures the left leg only. Check the model against your crank on SRAM's service pages before ordering.
- A new crankset anyway, on a budget. The Magene P515 at $299 replaces the whole crank (arms, spindle and spider meter) and takes 110BCD 4-bolt rings. It fits a Shimano 24 mm bottom bracket directly; Magene lists conditions for BB386 and T47, so read its compatibility notes.
- Several bikes, or you want both legs. Pedals. Among the dual-sided pedals here, Favero's Assioma DUO ($499, Look Keo) and PRO -2 ($789, SPD-SL, Look Keo or SPD) have the lowest brand-listed prices. The PRO also has the longest battery figure in this table, "Up to 160 hours per charge". Favero goes further and claims "the longest battery life among pedal-based power meters". We have not checked every pedal on the market, so treat that as Favero talking.
- Road and gravel on one meter. Favero sells road and SPD bodies for the PRO spindle ($130 a pair). Garmin sells RS ($149.99) and XC ($249.99) conversion kits. Our SPD power meter pedals for gravel guide covers the off-road versions.
- Speedplay riders. Wahoo's SPEEDPLAY POWER is the Speedplay option we found. Budget $59.99 per set of replacement cleats, more than twice what Garmin ($24.99) or Look ($28) charges.
Cleats and the new SPD-SLR system
The road pedals above list SPD-SL, Look Keo or Speedplay cleats. None of the product pages we checked lists Shimano's new SPD-SLR cleats. If you are moving to SPD-SLR, read our SPD vs SPD-SL vs SPD-SLR explainer first, and SPD-SLR power meter pedals for what to do about power until one exists.
Related on Pedal Brief
- SPD power meter pedals for gravel
- Shimano SPD vs SPD-SL vs SPD-SLR
- SPD-SLR power meter pedals: none listed yet, and the alternatives
- Smart trainer buying guide, if the meter is for indoor riding too
- Smart trainer drivetrain compatibility
- Ramp test vs 20-minute FTP test
Sources and notes
Notes and caveats
"Best value" here means three things: the brand-listed price, what you get for it (one leg or both), and the price of the parts you will replace. We checked each brand's spare-parts or accessories page as well as the product page. This is not every power meter on sale; the ones we left out are listed at the end.
This table covers only the products we checked, so "lowest" means lowest in this table.
Prices checked 26 September 2026 on each brand's US store. Magene's store is global rather than US-specific, but prices in dollars. None of these prices was marked as a sale. SRM's battery and accuracy figures are from the technical specs on its US shop page.
These are fits, not rankings. We have not tested any of them.
What we could not confirm
- Magene P515 battery life. The spec table says 380 hours; the FAQ on the same page says "approximately 330 hours". Both are lab figures.
- Garmin RK conversion kit price. The RS and XC kits show prices on Garmin's US store; the RK kit page did not when we checked.
- Garmin warranty. The Rally pages link to Garmin's general limited warranty rather than stating a term.
- SRAM accuracy and stock. The Rival pages give no accuracy figure, and we could not read stock status reliably from them, so we make no availability claim.
- Not covered: Shimano, Quarq, power2max, Rotor, InfoCrank and any brand without a checked US store price. We will add them after checking their stores and spares pages.
Sources
- Favero: Assioma PRO RS product page, Assioma PRO RS-2 shop page, Assioma DUO, Assioma UNO, PRO RS spares, PRO RL spares, PRO MX spares, first-generation spares
- Garmin: Rally RS110, Rally RS210, Pedal Body Conversion Kit, Charging Adapter, Dual-sensing Upgrade Spindle, RS Replacement Cleats, RK Replacement Cleats 6° Float, RK 110/210 Pedal Rebuild Kit
- Look: Keo Blade Power Single, Keo Blade Power Dual, US power accessories, checked 19 October 2026, Left Instrumented Power Axle (UK), spare parts
- Wahoo: SPEEDPLAY POWER Single, SPEEDPLAY POWER Dual, road cleats, charging kit, spacer and screw set
- SRM: X-Power Road, US store, X-Power Pedal Charger
- 4iiii: PRECISION 3+ Left-Side Ride Ready, PRECISION 3 and 3+ Maintenance Kit
- Stages: Stages Power L, Shimano 105 R7100, Gen 2/Gen 3 left battery door
- SRAM: PM-RIV-ASSY-E1, PM-RIV-ASSY-D1
- Magene: PES P515 Power Meter Set, QED Lightweight Split Chainring
All sources checked 26 September 2026, except Look's US power accessories page, re-checked 19 October 2026.
Disclosure: Pedal Brief may earn a commission if you buy through links on this page, at no extra cost to you. This version has no affiliate links. We have not tested these power meters. Every price and spec below comes from the brand's own store or product page, is linked, and was checked on 26 September 2026 in US dollars. Prices move, so check the brand page before you buy. Full disclosures.