SRAM RED AXS E1 2x Power Meter Chainring Kit

£648.00 GBP £1,227.00 GBP

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The AXS E1 2x Power Meter Chainring Kit combines accurate Quarq power measurement with a stiff one-piece chainrings and smooth X-Range gearing, making it a premium upgrade for Australian road racing, climbing, triathlon and structured cycling training.

SRAM RED AXS E1 2x Power Meter Chainring Kit Features

Integrated spider-based power meter provides claimed accuracy within plus or minus 1.5 per cent and reports left-to-right power balance.
One-piece aluminium chainrings create a light and rigid structure for crisp front shifting under load.
Every chainring combination uses a 13-tooth difference to reduce the cadence change during front shifts.
Six gearing options cover endurance riding, steep climbing, road racing and high-speed competition.
Directly upgrades compatible SRAM RED and Force eight-bolt crankarms without replacing the complete crankset

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SKU: PM-AXS-KITR-E1-4633T
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The SRAM RED AXS E1 2x Power Meter Chainring Kit combines a Quarq-based power meter, spider and paired aluminium chainrings in one integrated assembly. It is an upgrade kit rather than a complete crankset, so crankarms, DUB spindle, pedals and bottom bracket are not included.

General specifications

Product type: Integrated 2x power meter and chainring kit
Drivetrain configuration: 2x
Speed compatibility: SRAM 12-speed road
Power meter type: Spider-based
Power measurement: Total power with calculated left-to-right balance
Claimed accuracy: Plus or minus 1.5 per cent
Temperature compensation: Yes
Cadence measurement: Integrated
Cadence magnet required: No
Sensor connectivity: ANT+ and Bluetooth Low Energy
SRAM AXS app compatibility: Yes
Firmware updates: Supported
Manual calibration: Supported
Automatic zero functionality: Yes
Battery type: User-replaceable CR2032 coin cell
Typical battery life: Approximately 200 riding hours
Chainring material: Aluminium
Chainring construction: One-piece double chainring assembly
Chainring interface: SRAM eight-bolt direct mount
Conventional BCD: Not applicable
Chainring offset: 0mm
Standard installed chainline: 45mm with a compatible SRAM Road DUB crankset
Compatible chain technology: SRAM Road Flattop D1 and E1
Compatible front derailleur technology: SRAM Road Yaw
Compatible bottom-bracket family: SRAM Road DUB when installed on compatible crankarms
Crankarms included: No
Bottom bracket included: No
Front derailleur included: Size-dependent retail package, generally not included
Front-derailleur setup tool: Included with applicable retail configurations
Colour: Black and silver
Intended use: Road racing, gran fondo, triathlon, endurance road and time trial

Available chainring combinations

46/33T
48/35T
50/37T
52/39T
54/41T
56/43T

Every chainring pair has a 13-tooth difference. This supports consistent front-shift behaviour and limits the cadence disruption that occurs when moving between chainrings.

Important compatibility note

The SRAM RED AXS E1 2x Power Meter Chainring Kit requires compatible SRAM eight-bolt direct-mount road crankarms. Compatibility should be checked carefully if fitting it to an older SRAM crankset, as not every visually similar eight-bolt crank is approved for the current integrated chainring system.

The 52/39T, 54/41T and 56/43T combinations also require a compatible front derailleur, suitable mounting range and adequate frame clearance.

Integrated Quarq power measurement

The strain gauges, power-meter spider and paired chainrings form one integrated assembly. Positioning the measurement system at the spider allows it to capture the combined torque transferred from both crankarms into the chainrings.

The power meter combines measured torque with cadence to calculate rider output in watts. It also reports left-to-right power balance, providing an indication of how each side contributes through the pedal cycle.

The balance figure is calculated from the distribution of torque rather than measured by two completely independent sensors. It is useful for monitoring trends but should not be interpreted as a clinical assessment of leg function.

Useful training metrics include:

Current power
Average power
Maximum power
Cadence
Left-to-right power balance
Normalised or weighted power when calculated by a compatible head unit
Intensity factor
Training load
Interval consistency
Race pacing data

Temperature compensation

The power meter is designed to retain its claimed accuracy as the ambient temperature changes. This is especially relevant in Australian conditions, where a pre-dawn session can progress from cool air into intense summer heat.

Temperature compensation reduces measurement drift, although a manual zero calibration before an important training test or race remains recommended.

One-piece aluminium chainrings

The inner and outer chainrings are produced as one integrated aluminium structure rather than two separately mounted rings. This increases lateral stiffness and allows SRAM to control the spacing, shift ramps, pickup points and tooth profiles precisely.

Eight-bolt direct mount

The power meter attaches directly to approved SRAM crankarms through an eight-bolt interface. This eliminates a conventional four-bolt or five-bolt chainring spider and creates a stiff connection between the crankarms and chainrings.

The interface also gives compatible SRAM RED and Force crank owners a direct path to crank-based power measurement without purchasing new crankarms.

ANT+ and Bluetooth connectivity

ANT+ provides compatibility with most premium cycling computers, including supported Garmin, Wahoo and Hammerhead devices. Bluetooth Low Energy supports compatible smartphones, indoor training applications and other connected devices.

46/33T

The 46/33T combination is the most climbing-oriented option. It is well suited to steep Australian roads, alpine events, gran fondos and endurance riders who prefer a higher cadence.

Paired with a SRAM 10-36T cassette, the 33-tooth inner ring provides a climbing ratio below one-to-one while the 46-tooth outer ring still offers substantial top-end speed through the 10-tooth sprocket.

48/35T

The 48/35T combination provides the strongest all-round balance for Australian club riders. It suits road racing, rolling terrain, fast bunch rides and hilly endurance events without requiring exceptionally high power on climbs.

50/37T

The 50/37T option is directed towards stronger road riders, criterium racers and cyclists who frequently ride at high bunch speeds. The 10-tooth smallest cassette sprocket gives the 50-tooth ring more top-end gearing than its size might suggest.

The SRAM RED AXS E1 2x Power Meter Chainring Kit is best suited to competitive road cyclists, triathletes and performance-focused cyclists who want reliable training data without replacing their compatible SRAM crankarms.

The recorded power and cadence data remained closely aligned with the comparison units, supporting the system’s suitability for structured training and racing. The review also praised its straightforward ANT+ and Bluetooth connectivity and deeper integration with Garmin, Wahoo and Hammerhead cycling computers.

Road.cc reviewed the complete SRAM RED AXS E1 groupset on 15 May 2024 and awarded it 9/10. Reviewer Stu Kerton praised its performance, ergonomics, weight and overall refinement, describing the complete system as one of the strongest premium electronic road groupsets available.