SRAM RED AXS E1 2x Carbon DUB Road Crankset

$803.00 USD

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The SRAM RED AXS E1 Crankset combines exceptionally light hollow carbon arms, stiff one-piece chainrings and smooth X-Range gearing, delivering a responsive performance upgrade for Australian road racing, alpine climbing and fast endurance riding.

Key SRAM RED AXS E1 Crankset Features

One-piece aluminium chainrings improve stiffness, durability and front-shift accuracy.
Hollow carbon crankarms help make the crankset 29 grams lighter than the previous SRAM RED generation.
X-Range gearing uses a consistent 13-tooth chainring difference for smaller cadence changes during front shifts.
Three chainring combinations and six complete-crankset lengths support racing, climbing and personalised bike fit.
Eight-bolt direct-mount construction allows conversion to a compatible SRAM AXS power meter.

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Crank Arm (type, mm)

Tooth Count/Gear Ratio

SKU: FC-RED-E1
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The SRAM RED AXS E1 Crankset is a premium 2x12-speed road crankset designed around lightweight carbon construction, SRAM DUB bottom-bracket technology and integrated X-Range chainrings.

General specifications

Product type: Double road bike crankset
Drivetrain configuration: 2x
Number of speeds: 12
Intended use: Road racing, endurance road, triathlon and compatible all-road riding
Crankarm material: Hollow carbon fibre
Chainring material: Aluminium
Chainring construction: One-piece integrated double chainring
Chainring mounting interface: SRAM eight-bolt direct mount
Conventional BCD: Not applicable
Spindle system: SRAM Road DUB
Nominal spindle diameter: 28.99mm
Bottom-bracket compatibility: SRAM Road DUB bottom brackets
Bottom bracket included: No
Standard chainline: 45mm
Chainring offset: 0mm
Compatible chainring combinations: 46/33T, 48/35T and 50/37T
Difference between chainrings: 13 teeth
Compatible chains: SRAM Road Flattop D1 and Road Flattop E1
Compatible front derailleur technology: SRAM Road Yaw
Pedal thread: Standard 9/16-inch
Power meter included: No
Power meter upgradeable: Yes
Colour: Natural carbon, black and silver
Claimed weight: 545 grams
Weight basis: 172.5mm crankarms with 48/35T chainrings
Claimed weight reduction: 29 grams compared with the previous generation

Complete crankset lengths

160mm
165mm
167.5mm
170mm
172.5mm
175mm

Additional crankarm lengths

SRAM also offers separate RED E1 crankarm assemblies in 150mm and 155mm lengths. These shorter arms may be combined with compatible RED eight-bolt chainring assemblies, but they are not consistently listed as factory-complete crankset variants in every market.

Package contents

Left SRAM RED carbon crankarm
Right SRAM RED carbon crankarm with DUB spindle
One-piece double chainring assembly
Crank preload components
Standard crank assembly hardware

Not included

SRAM Road DUB bottom bracket
Power meter
Pedals
Flattop chain
Cassette
Front derailleur
Installation tools
Bicycle workshop installation

Hollow carbon crankarm construction

The SRAM RED AXS E1 Crankset uses hollow carbon crankarms made with an optimised fibre lay-up. Carbon material is concentrated in structurally important areas while unnecessary material is removed from lower-stress zones.

This construction helps SRAM reduce weight without sacrificing the lateral stiffness required for sprinting, climbing and shifting under load. SRAM claims the updated E1 crankset is 29 grams lighter than the previous RED generation.

The low mass will not transform performance in isolation, but it complements a lightweight race bike and contributes to a responsive feel during accelerations and out-of-saddle climbing.

One-piece aluminium chainrings

The large and small chainrings are manufactured as one integrated aluminium structure rather than two independently mounted rings. This creates a very stiff relationship between the two chainrings and allows SRAM to position the shifting ramps, pins and pickup points with high precision.

Benefits include:

Crisp front shifting
Reduced flex between the chainrings
Consistent chainring spacing
Improved shifting under moderate pedalling load
Lower structure weight
Reduced number of mounting interfaces
Clean, premium appearance

The trade-off is that the individual chainrings cannot be replaced separately. When the teeth eventually wear out, the complete double-chainring assembly must be replaced.

X-Range gearing

SRAM X-Range road gearing uses smaller front chainrings in combination with cassettes beginning at a 10-tooth sprocket. This produces a wide total gear range without relying on an excessively large difference between the front chainrings.

Every available combination uses a 13-tooth jump:

46/33T
48/35T
50/37T

The smaller difference reduces the cadence change when shifting between chainrings. It also requires fewer compensating rear shifts to return to the rider’s preferred cadence.

Eight-bolt direct mount

The chainring assembly attaches to the crankarms through SRAM’s eight-bolt direct-mount interface. This modular design allows the crankarms to accept compatible SRAM non-power chainrings, power-meter spiders and integrated power-meter chainring assemblies.

A rider can therefore purchase the non-power crankset and later convert it to power measurement without replacing the hollow carbon crankarms.

DUB spindle technology

The SRAM DUB system uses a 28.99mm spindle. It is designed to balance spindle stiffness, bearing size, sealing and compatibility across common road bottom-bracket standards.

A frame-specific SRAM Road DUB bottom bracket connects the crankset to common shell types, including selected:

BSA threaded frames
PressFit frames
T47 frames
BB86 frames
BB30 or PF30 frames using the appropriate SRAM DUB bottom bracket

DUB does not mean one bottom bracket fits every frame. The bottom bracket must match both the DUB spindle and the bicycle’s shell standard.

160mm crankarms

The 160mm option suits smaller riders, cyclists with limited hip mobility and riders seeking a more open hip angle. It can also provide additional pedal clearance during criterium cornering and allow a lower aerodynamic torso position without excessive hip closure.

165mm crankarms

The 165mm length has become increasingly popular among road racers and triathletes. It can reduce peak hip and knee flexion while supporting a smoother, higher-cadence pedalling style.

167.5mm crankarms

The 167.5mm size offers a useful intermediate option for riders who find 165mm too short and 170mm slightly too long. It allows more precise fitting than the traditional five-millimetre jumps between crank lengths.

170mm crankarms

The 170mm option is a versatile choice that suits a wide range of road cyclists. It offers a familiar feel while providing slightly more pedal clearance than a 172.5mm or 175mm crank.

172.5mm crankarms

The 172.5mm version remains a widely used road size and is the length on which SRAM bases the crankset’s published 545-gram weight.

175mm crankarms

The 175mm option suits riders whose leg proportions, joint mobility and established fit favour a longer pedal circle. Rider height alone should not be used to select this length.

Crank-length fitting considerations

Changing crank length affects the position of the pedals at both the top and bottom of the stroke. When moving from a longer crank to a shorter one, the saddle will generally need to be raised by approximately the same amount as the reduction in crank length.

For example, changing from 172.5mm to 165mm cranks may require an initial saddle-height increase of approximately 7.5mm.

Chainring selection

46/33T

The 46/33T combination provides the easiest climbing gears of the three options. It is well suited to gran fondos, steep Australian climbs, long endurance rides and riders who prefer a high cadence.

When paired with a 10-36T cassette, the 33-tooth inner chainring provides a climbing ratio below one-to-one.

48/35T

The 48/35T combination is the most versatile choice for club riding, racing and mixed terrain. It provides useful climbing performance without sacrificing substantial top-end speed.

This is the configuration used for SRAM’s claimed 545-gram crankset weight when fitted with 172.5mm arms.

50/37T

The 50/37T combination is intended for powerful road racers, fast bunch riders and flatter courses. When paired with a cassette beginning at 10 teeth, the 50-tooth outer ring provides a higher top gear than a traditional 50-tooth chainring combined with an 11-tooth cassette.

The SRAM RED AXS E1 Crankset is best suited to road racers, triathletes, gran fondo riders and performance-focused cyclists building a lightweight SRAM AXS road bike. Its stiff one-piece chainrings provide fast front shifting.

Cyclist published its SRAM RED AXS E1 review on 15 May 2024. The publication highlighted the groupset’s competitive weight, accurate shifting and extensive electronic integration. The review found the update refined rather than revolutionary in every area, but regarded the overall package as a meaningful improvement over the previous generation.

GRAN FONDO Cycling Magazine tested SRAM RED AXS E1 on 15 May 2024 and found that the groupset’s improvements extended beyond simple weight reduction. The publication praised SRAM’s focus on usability, gearing choice and fit, including the introduction of shorter crankarms for riders seeking a more open hip angle.

Bikerumor published a long-term review on 27 January 2025 after approximately eight months of riding. The reviewer described the complete RED AXS E1 system as refined, dependable and enjoyable to use. Continued compatibility with existing 12-speed AXS components was also viewed positively because riders could upgrade selected parts rather than replacing the entire drivetrain.

Routine cleaning

Wash the crankset with mild bicycle cleaner, clean water and a soft cloth.
Avoid aggressive solvents and abrasive polishing products.
Do not direct high-pressure water at the bottom-bracket seals.
Remove accumulated chain lubricant from the chainrings and crankarms.
Dry the crankset following wet rides.
Avoid applying degreaser directly to bottom-bracket bearings.

Carbon crankarm inspection

Inspect the crankarms regularly for:

Cracks
Deep scratches
Gouges
Raised or separated carbon fibres
Crushing damage
Pedal-thread damage
Damage around the spindle interface
Heavy heel rub
Significant impact marks

Stop riding if structural damage is suspected. Cosmetic filler or adhesive should not be used to repair a damaged carbon crankarm.

Chain and chainring maintenance

Clean and lubricate the chain regularly.
Use lubricant suited to local weather and road conditions.
Remove excess lubricant to reduce dust accumulation.
Measure chain wear with a compatible chain checker.
Replace a worn chain before it accelerates chainring and cassette wear.
Inspect the chainrings after a dropped chain.
Check the teeth for hooking, impact damage or deformation.
Use only compatible SRAM chains and drivetrain components.

Bottom-bracket maintenance

Check for bearing play, roughness and creaking.
Confirm that the crank preload remains correctly adjusted.
Inspect the spindle and seals during scheduled servicing.
Replace contaminated or worn bearings promptly.
Have persistent noise diagnosed by an experienced bicycle mechanic.
Avoid assuming every creak originates from the bottom bracket, as pedals, chainring interfaces and frame hardware can produce similar noises.