SRAM RED AXS E1 Carbon DUB Crankarm Assembly

$394.90 AUD

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What is it? An exceptionally light, stiff and adaptable road bike upgrade, offering efficient power transfer, extensive crank-length options and compatibility with SRAM AXS chainrings and power meters for racing, climbing and high-performance Australian riding.

SRAM RED AXS E1 Carbon DUB Crankarm Features

Hollow carbon crankarms are 29 grams lighter than the previous SRAM RED generation.
Eight-bolt direct-mount interface accepts compatible SRAM AXS chainrings, spiders and power meters.
Available in crank lengths from 150mm to 175mm for improved bike fit and pedalling efficiency.
SRAM DUB spindle system provides broad frame compatibility, straightforward installation and dependable bearing support.
Suitable for 1x or 2x SRAM AXS road configurations, including standard Road DUB and Road Wide DUB applications.

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The SRAM RED AXS E1 Carbon DUB Crankarm Assembly includes the left and right carbon crankarms with an integrated DUB spindle. It does not include chainrings, an AXS spider, power meter or bottom bracket.

Product type: Road bicycle crankarm assembly
Model family: SRAM RED AXS E1
Manufacturer model ID: FC-RED-ASSY-E1
Intended use: Road, triathlon, cyclocross and compatible all-road builds
Crankarm material: Hollow carbon fibre
Spindle system: SRAM DUB Road
Nominal spindle diameter: 28.99mm
Chainring interface: SRAM eight-bolt direct mount
BCD specification: Direct Mount rather than a conventional replaceable BCD
Compatible drivetrain layouts: 1x and 2x
Compatible bottom brackets: SRAM Road DUB and Road Wide DUB
Compatible chain technology: SRAM Road Flattop D1 and Road Flattop E1
Crank lengths: 150, 155, 160, 165, 167.5, 170, 172.5 and 175mm
Crank lenght availability as per options listed and stock level
(we do not have ready access to 150 or 155mm crank arm)
Pedal thread: Standard 9/16-inch
Finish: Natural black carbon with RED graphics
Power meter supplied: No
Power meter compatible: Yes, when combined with a compatible SRAM AXS eight-bolt power-meter spider or integrated power-meter chainring assembly
Chainrings supplied: No
Bottom bracket supplied: No
Claimed weight reduction: 29 grams compared with the preceding RED crankarm generation
Measured weight: Approximately 309 to 311 grams for a 172.5mm assembly, with minor variation between samples and included hardware
Approximate road Q-factor: 145mm when installed as part of the appropriate standard Road DUB system

Optimised hollow carbon construction

SRAM revised the carbon lay-up and manufacturing process to remove material without compromising the stiffness expected from its flagship road crank. The hollow construction concentrates carbon where it contributes most to strength and pedalling rigidity, helping the assembly achieve a 29-gram reduction from the previous generation.

The practical benefit is a very low rotating and reciprocating mass, particularly valuable on a lightweight race bike or premium climbing build. While a crankarm upgrade will not transform performance on its own, it can complete a low-weight build while maintaining the solid response expected during out-of-saddle acceleration.

SRAM eight-bolt direct mount

The eight-bolt interface is one of the crankarm assembly’s most useful features. It allows the owner to build the crank with a compatible non-power spider, power-meter spider, integrated road chainring or supported 1x chainring.

This modular construction is especially attractive to existing SRAM AXS riders. A cyclist can initially install a non-power chainring assembly and add compatible power measurement later without replacing the carbon crankarms.

DUB spindle system

SRAM DUB uses a 28.99mm spindle and frame-specific bottom brackets to cover numerous bottom-bracket shell standards. The design aims to balance spindle stiffness, bearing size, sealing and serviceability.

The crankarms can therefore be fitted to many modern road frames once the correct SRAM Road DUB or Road Wide DUB bottom bracket is selected. DUB compatibility does not mean that one bottom bracket fits every frame. The bottom bracket must still match the bicycle’s threaded, press-fit or T47 shell standard.

Expanded short-crank sizing

The addition of 150mm, 155mm and 160mm options reflects growing demand for shorter road crankarms. Shorter cranks can increase pedal clearance, reduce peak hip and knee flexion and allow some riders to maintain a more open hip angle in an aerodynamic position.

They are not automatically faster for every cyclist. Saddle height, saddle setback and cockpit position should be reassessed whenever crank length changes substantially.

Power-ready construction

The crankarms do not contain strain gauges or electronics, but the eight-bolt mounting pattern makes them compatible with selected SRAM and Quarq AXS power-meter systems. This gives riders the choice of building a lightweight non-power crank or creating a race-ready power-meter setup for structured training.

Natural carbon finish

The visible carbon construction gives the product a restrained premium appearance while avoiding unnecessary decorative material. As with any carbon component, the crankarms must be inspected after a crash or significant pedal strike and installed using the specified procedures and torque settings.

Product crank lengths

150mm (not available)
155mm (not available)
160mm
165mm
167.5mm
170mm
172.5mm
175mm

Shorter crank lengths

The 150mm to 165mm options are well suited to smaller riders, cyclists with limited hip or knee mobility, triathletes seeking a more open hip angle and riders experimenting with a higher-cadence pedalling style. They also increase pedal clearance through corners, which can be useful in criteriums and on bikes with lower bottom brackets.

Mid-length options

The 167.5mm and 170mm choices provide intermediate fit options for riders who find the traditional 172.5mm road standard slightly long but do not want to move directly to a 165mm crank.

Longer crank lengths

The 172.5mm and 175mm versions suit riders whose fit, biomechanics and established pedalling style favour a longer lever. Rider height alone should not determine crank length, as leg proportions, joint mobility, riding position and cadence preference are equally relevant.

Fit considerations

Changing to a crank that is 5mm shorter may require the saddle to be raised by approximately 5mm as an initial fitting adjustment.
Saddle fore-aft position and handlebar drop may then need to be reassessed.
The complete crank configuration must provide the correct chainline for the frame and front derailleur.
A standard road build and a Road Wide build may require different bottom-bracket, chainring and front-derailleur arrangements.
Frame clearance should be checked around the chainstays, bottom-bracket shell and power-meter housing.
Riders using a 2x drivetrain must select a compatible SRAM AXS chainring assembly and position the front derailleur correctly.
Bottom-bracket shell preparation and installation tolerances can affect bearing life and drivetrain noise.

The SRAM RED AXS E1 Carbon DUB Crankarm Assembly is best suited to performance road cyclists, weight-conscious racers, triathletes and experienced AXS owners building a premium custom bike or changing crank length without replacing an entire groupset. Its stiff hollow carbon structure feels direct during bunch-ride accelerations, criterium sprints and steep climbing, while the broad range of shorter lengths is particularly useful for riders seeking better hip clearance, smoother high-cadence pedalling or additional pedal clearance through corners.

Cleaning and routine inspection

Clean the crankarms with mild bicycle cleaner, water and a soft cloth.
Do not use aggressive solvents or abrasive polish on the carbon finish.
Avoid directing high-pressure water at the bottom-bracket seals.
Inspect both crankarms regularly for cracks, deep scratches, impact marks or changes around the pedal threads and spindle bond.
Check for lateral movement, bearing roughness, creaking or unusual drivetrain noise.
Inspect the eight-bolt chainring or spider interface during scheduled drivetrain servicing.
Confirm pedal tightness and inspect the pedal threads whenever pedals are removed.
Use pedal washers if required by the pedal or crank manufacturer.
Do not ride the crankarms after a substantial crash or severe pedal strike until they have been professionally inspected.

Installation and servicing

The crankarm assembly must be fitted using SRAM’s current DUB installation procedure. The frame requires the correct Road DUB or Road Wide DUB bottom bracket, and all preload, retaining and mounting parts must be installed in the correct order.

A professional bike shop installation is recommended because poor bottom-bracket preparation, incorrect preload or unsuitable spacers can cause premature bearing wear, drivetrain noise or crank movement. Any power-meter spider or chainring must also be installed using its specified hardware, tightening sequence and torque.

Warranty

SRAM generally warrants its bicycle components to the original owner against qualifying defects in materials or workmanship for two years from the original purchase date. Proof of purchase is required, and claims are normally processed through the original retailer or an authorised SRAM dealer.

Road.cc reviewed the complete SRAM RED AXS E1 groupset on 15 May 2024 and awarded it 9/10. The review praised the groupset’s performance, ergonomics and competitive weight. Although the controls and braking received most of the attention, the lighter crank construction contributed to a complete package described as one of the strongest flagship electronic road groupsets available.

Bikerumor published a longer-term SRAM RED AXS E1 review on 27 January 2025 following approximately eight months of use. The reviewer regarded the new generation as a refined and highly compatible flagship platform, with continued support for SRAM’s existing 12-speed AXS components making selective upgrades more practical than a complete drivetrain replacement.

Rider and forum sentiment

Weight-focused riders have responded positively to measured weights of approximately 309 to 311 grams for the 172.5mm crankarm assembly. Forum discussion has also welcomed SRAM’s move into shorter carbon crank lengths, with 160mm and 165mm versions

SRAM Force AXS Carbon DUB Crankarm Assembly

The SRAM Force AXS carbon crankarm assembly shares the DUB spindle concept and eight-bolt compatibility, making it the most logical value alternative for many AXS riders.

Advantages of SRAM Force AXS:

Lower purchase price
Carbon construction
Compatible with supported AXS spiders and chainrings
Excellent choice for training and performance road bikes

Advantages of SRAM RED AXS E1:

Lower weight
More premium carbon construction and finish
Wider availability of highly specific short-crank sizes
Better suited to flagship race builds and weight-focused upgrades

The Force option represents better value for most recreational and club cyclists. RED is the more compelling choice when minimum weight, exact fit and premium construction take priority.

Previous-generation SRAM RED AXS D1 Crankarm Assembly

The earlier RED crank remains light, stiff and compatible with SRAM’s eight-bolt AXS ecosystem.

Advantages of the previous generation:

Often available at a discounted price
Proven construction
Existing chainrings and power-meter components may be reusable

Advantages of the E1 version:

Approximately 29 grams lighter
Updated carbon manufacturing process
Broader crank-length choice, including modern shorter options
Current-generation graphics and product support

Cyclists who already own a correctly sized D1 crank will gain only a modest performance difference from changing the arms alone. E1 offers greater value when changing crank length, replacing a damaged assembly or completing a new lightweight build.

Shimano Dura-Ace FC-R9200 Crankset

Shimano Dura-Ace uses hollow aluminium crankarms and a conventional integrated Shimano road crank design rather than SRAM’s modular eight-bolt system.

Advantages of Shimano Dura-Ace:

Excellent shifting when used with matching Shimano chainrings and front derailleur
Wide Australian workshop familiarity
Mineral-oil Di2 ecosystem is popular across premium road bikes

Advantages of SRAM RED AXS E1:

Carbon crankarm construction
Modular compatibility with power and non-power AXS components
Wider selection of short crank lengths
Easier integration into an existing SRAM AXS build

These products are not direct component-level substitutes. Changing between them may require different bottom brackets, chainrings, chains and drivetrain components.