SRAM RED XPLR AXS E1 Wide Power Meter Crankset

£1,027.00 GBP

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The SRAM RED XPLR AXS E1 Wide Power Meter Crankset combines accurate dual-leg power measurement, ultra-light carbon crankarms and replaceable gravel-specific chainrings, creating a premium performance upgrade for Australian gravel racing, mixed-surface training and demanding all-road adventures.

Key SRAM RED XPLR AXS E1 Wide PM Crankset Features

Spider-based power meter delivers claimed accuracy within plus or minus 1.5 per cent and reports left-to-right power balance.
Replaceable Thread Mount chainrings make gearing changes and worn-ring replacement more economical.
Ultra-light hollow carbon crankarms are 29 grams lighter than the previous SRAM RED generation.
Wide 47.5mm chainline provides additional frame and tyre clearance for modern gravel bikes.
Eight crank lengths from 150mm to 175mm were originally manufactured. Those support precise bike fitting for gravel racers and endurance riders. It is a high-demand and limited stock item locally, check stock levels and ETA

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The SRAM RED XPLR AXS E1 Wide Power Meter Crankset is a premium 1x gravel crankset combining hollow carbon crankarms, a Wide DUB spindle, a spider-based power meter and a removable Thread Mount chainring.

Product type: Gravel power meter crankset
Drivetrain configuration: 1x
Speed compatibility: Approved SRAM 12-speed and 13-speed systems
Crankset type: Road Wide and XPLR
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
Automatic zero: Yes
Manual calibration: Supported
Connectivity: ANT+ and Bluetooth Low Energy
SRAM AXS app support: Yes
Firmware updates: Supported
Battery type: User-replaceable CR2032
Claimed battery life: Approximately 200 riding hours
Water-resistance rating: IPX7, tested to one metre for 30 minutes
Crankarm material: Hollow carbon fibre
Chainring material: Aluminium
Chainring construction: Replaceable Thread Mount
Chainring technology: SRAM X-SYNC
Common complete-crankset chainrings: 38T, 40T, 42T, 44T and 46T
Additional service compatibility: Selected 48T and 50T chainrings may be supported
Chainring offset: 6.5mm
Chainline: 47.5mm
Spider-to-crank interface: SRAM eight-bolt direct mount
Spindle interface: SRAM Wide DUB
Nominal spindle diameter: 28.99mm
Bottom-bracket compatibility: SRAM Road Wide DUB
Bottom bracket included: No
Compatible chain technologies: SRAM Road Flattop D1, Road Flattop E1 and other expressly approved SRAM configurations
Front derailleur required: No
Pedal thread: Standard 9/16-inch
Colour: Natural carbon, black and silver
Intended use: Gravel racing, endurance gravel, cyclocross and mixed-surface riding

Spider-based power measurement

The power meter measures torque at the spider, where power from both crankarms enters the chainring. It combines measured torque with cadence to calculate total rider power in watts.

Unlike a basic single-sided crank sensor that measures one leg and doubles the value, the spider receives the combined output generated through both crankarms. It also reports a calculated left-to-right power balance.

Useful training information includes:

Current power
Average power
Maximum power
Cadence
Left-to-right power balance
Normalised or weighted power calculated by a compatible cycling computer
Interval consistency
Training intensity
Race pacing
Long-ride fatigue trends

Left-to-right balance is calculated from torque distribution rather than measured using two independent sensors. It is useful for monitoring trends but should not be treated as a medical or biomechanical diagnosis.

Active temperature compensation

The power meter automatically compensates for temperature changes that could otherwise affect strain-gauge readings. This is particularly valuable during Australian rides that start in cool pre-dawn conditions and finish in substantially warmer weather.

Temperature compensation reduces measurement drift and supports consistent comparisons between intervals, events and seasonal training blocks.

Replaceable Thread Mount chainring

The aluminium X-SYNC chainring threads directly onto the power-meter spider using SRAM’s Thread Mount system. This creates a broad, stiff interface while allowing the chainring to be removed independently of the power meter.

The system offers several practical benefits:

Worn chainrings can be replaced separately.
Riders can change gearing without replacing the power meter.
The power-meter spider can remain on the crankset.
The broad threaded interface supports secure power transfer.
The design eliminates conventional chainring bolts.
The complete crankset retains a clean, integrated appearance.

A dedicated SRAM Thread Mount chainring tool is required. Incorrect tools should not be used because they may damage the chainring interface or power-meter assembly.

X-SYNC chain retention

SRAM X-SYNC uses alternating wide and narrow teeth corresponding with the chain’s inner and outer links. Tall tooth profiles engage the chain early, while shaped recesses help clear dirt from around the rollers.

Wide DUB construction

The Wide DUB spindle positions the chainring further outboard than a standard road crankset, producing a 47.5mm chainline. This can increase clearance around wide tyres, chainstays and modern gravel-frame structures.

The 28.99mm DUB spindle is designed to balance stiffness, bearing dimensions and sealing. A frame-specific Road Wide DUB bottom bracket is still required.

The bottom bracket must match both the crankset and the bicycle’s shell standard. DUB does not refer to one universal bottom bracket.

Serviceable modular design

The crankarms, power-meter spider and Thread Mount chainring are separate serviceable elements. This improves long-term ownership because the rider can replace a worn chainring without discarding the power meter or carbon crankarms.

Crank length selection

150mm and 155mm

These very short crank lengths can suit smaller riders, cyclists with restricted hip mobility and riders seeking greater clearance through technical corners. They may also help preserve an open hip angle when using an aggressive gravel-racing position.

160mm and 165mm

These increasingly popular lengths can reduce peak hip and knee flexion while supporting a smooth, higher-cadence pedalling style. They also provide greater pedal clearance over rocks, ruts and off-camber corners.

167.5mm and 170mm

These middle-length options suit riders looking for a balance between shorter contemporary fitting trends and traditional road dimensions. The 167.5mm length offers a useful intermediate step between 165mm and 170mm.

172.5mm and 175mm

These longer options suit riders whose leg proportions, mobility and established fit favour a larger pedal circle. Rider height alone should not determine crank length.

Bike-fit considerations

Changing crank length affects the upper and lower positions of the pedal stroke. Moving to a shorter crank normally requires the saddle to be raised by approximately the same amount as the decrease in crank length.

A substantial change may also affect:

Saddle setback
Cleat position
Handlebar height
Handlebar reach
Hip angle
Knee movement
Cadence
Pedal clearance
Weight distribution
Standing climbing position

Professional gravel bike fitting is recommended when changing crank length to improve comfort, manage mobility limitations or refine an aerodynamic position.

Chainring selection

38T

The 38T chainring provides the lowest gearing and best climbing capacity. It suits steep fire roads, technical gravel, long adventure events and loaded riding.

40T

The 40T version offers a practical balance for hilly gravel racing and endurance riding. It supplies useful climbing gears without greatly limiting speed on sealed connecting roads.

42T

The 42T chainring is a versatile all-round gravel choice. It suits mixed courses that combine long dirt climbs, rolling gravel and faster road sectors.

44T

The 44T version favours faster racing while retaining reasonable climbing flexibility when paired with a 10-44T or 10-46T cassette.

46T

The 46T chainring is intended for fast gravel races, flatter events and strong riders who prioritise high-speed gearing.

Chainline and chainstay compatibility

Chainline: 47.5mm
Chainring offset: 6.5mm
Crank configuration: Road Wide and XPLR
Recommended frame use: XPLR bikes with chainstays of 415mm or longer
Short-chainstay guidance: Compatible frames at 414mm or shorter generally use a standard road crankset
Bottom bracket: SRAM Road Wide DUB required
Chainring attachment: Thread Mount
Spider attachment: Eight-bolt direct mount

Frame compatibility checks

Before ordering, confirm that:

The frame supports a SRAM Road Wide DUB crankset.
The correct bottom bracket is available for the frame shell.
The frame provides adequate chainring and power-meter clearance.
The chainstays clear the carbon crankarms.
The selected rear derailleur and cassette support the chainring.
The drivetrain uses a compatible chain.
The frame’s chainstay length suits the Wide chainline.
The rear tyre does not contact the crankarms.
The intended chainring provides appropriate gearing for local terrain.

The SRAM RED XPLR AXS E1 Wide Power Meter Crankset is best suited to serious gravel racers, endurance riders and data-driven cyclists building a premium Wide-chainline bike.

DC Rainmaker published an in-depth review of SRAM’s updated RED AXS power-meter platform on 16 May 2024 after more than two months of testing. Power and cadence data were compared with established reference devices during steady riding, intervals and harder accelerations. The recorded data aligned closely with the comparison units, while ANT+ and Bluetooth connectivity worked reliably with mainstream cycling computers. Although the testing centred on the road version, the XPLR crankset uses the same underlying Quarq measurement approach.

Bikerumor published a detailed first-ride assessment of the SRAM RED XPLR AXS system in August 2024. The publication highlighted the new Thread Mount power-meter crankset as a meaningful serviceability improvement, particularly because chainrings could be replaced without discarding the power-meter spider. It also praised the extensive crank-length range and low system weight.

Routine cleaning

Clean the crankset with mild bicycle cleaner, water and a soft cloth.
Remove packed dirt from around the spider and chainring.
Avoid aggressive solvents and abrasive polishing products.
Do not direct high-pressure water at the power meter or bottom-bracket seals.
Keep strong degreaser away from the battery compartment.
Dry the crankset after wet rides and creek crossings.
Remove excess chain lubricant before it attracts abrasive dust.

Power-meter maintenance

Replace the CR2032 battery when a low-charge warning appears.
Use a fresh battery from a reputable manufacturer.
Clean the battery compartment before installing the replacement.
Inspect the battery-cover seal for dirt, flattening or damage.
Confirm that the cover is secured correctly.
Install firmware updates through the SRAM AXS app.
Perform a manual zero calibration after installation or battery replacement.
Enter the correct crank length into the cycling computer.
Calibrate before important testing or racing where practical.

Carbon crankarm inspection

Inspect both crankarms regularly for:

Cracks
Deep gouges
Raised carbon fibres
Crushing damage
Heavy heel rub
Pedal-thread damage
Spindle-area damage
Significant impact marks

Stop riding if structural damage is suspected. Damaged carbon crankarms should be professionally assessed rather than repaired with general-purpose resin or adhesive.

Chain and chainring care