SRAM RED XPLR XG-1391 13-Speed 10-46T Cassette

$664.00 USD

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XG-1290 E1 combines remarkably low weight, electronically optimised shifting and four carefully developed gear ranges, making it a premium performance upgrade for Australian road racing, steep climbing, endurance riding and fast all-road builds.

SRAM RED XG-1290 E1 Rainbow Cassette Features

Four 12-speed ranges spanning race-focused 10-28T through to climbing-friendly 10-36T gearing
One-piece machined steel X-DOME construction delivers high stiffness, low weight and outstanding drivetrain precision
Shift ramps developed specifically for fast, decisive electronic AXS shifting
X-Range progression delivers close cadence steps alongside a useful 10-tooth high gear
Premium Rainbow finish creates a distinctive centrepiece for SRAM RED AXS custom builds

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SKU: CS-XG-1391-E1
Barcode: 0710845898358

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SRAM RED XPLR XG-1391 Cassette is the flagship cassette for SRAM’s dedicated 1x13-speed XPLR gravel drivetrain. Its progression uses close one-tooth steps at the high-speed end before introducing progressively larger jumps towards the climbing gears.

Product type: Gravel bike cassette
Drivetrain configuration: 1x only
Number of speeds: 13
Cassette range: 10-46T
Total gearing range: 460 per cent
Individual sprockets: 10, 11, 12, 13, 15, 17, 19, 21, 24, 28, 32, 38 and 46T
Smallest sprocket: 10T
Largest sprocket: 46T
Freehub interface: SRAM XDR
Compatible chains: SRAM Road Flattop D1 and E1
Compatible rear derailleurs: SRAM RED, Force and Rival XPLR AXS E1 13-speed models
Construction technology: SRAM XG and revised X-Dome architecture
Primary sprocket material: Hardened tool steel
Largest sprocket material: Aluminium
Finish: Silver with black detailing
Claimed weight: 288 grams
Independently measured weight: Approximately 289 grams
Lockring system: Integrated XDR cassette fastening arrangement
Intended use: Gravel racing, cyclocross and performance all-road riding
E-bike suitability: Subject to approval within the complete bicycle and drivetrain configuration

Compatibility warning

The SRAM RED XPLR XG-1391 Cassette is not a direct replacement for a 12-speed road or gravel cassette. Converting an older bicycle generally requires a compatible 13-speed XPLR rear derailleur, Road Flattop chain, suitable AXS controls and a UDH-compatible frame that accepts the corresponding Full Mount derailleur.

Revised X-Dome construction

SRAM uses an advanced XG cassette structure to achieve high stiffness at a remarkably low weight. The smaller sprockets are extensively machined from hardened steel, creating a lightweight structure that resists twisting during shifting and high-torque pedalling.

The three largest sprockets incorporate aluminium to reduce mass further. This material distribution keeps durable steel in the heavily used high-speed section while allowing SRAM to remove weight from the physically larger climbing sprockets.

The result is a cassette that weighs approximately 95 grams less than the Force XPLR equivalent and approximately 195 grams less than the Rival XPLR model, based on published weights for the three 13-speed ranges.

Thirteen-speed ratio optimisation

Adding a thirteenth sprocket allows SRAM to expand the largest cog from the previous XPLR generation’s 44T to 46T while also reducing the jumps between the fastest gears.

The key benefit is not simply having another gear. It is the ability to combine:

Close high-speed cadence control
Useful mid-range progression
A genuine low climbing gear
Broad 460 per cent range
Simple 1x operation
No front derailleur
No front chainring shift

This arrangement is particularly effective for modern gravel racing, where courses often combine fast bunch sections, sealed-road transfers and steep off-road climbs.

Optimised shifting features

Every sprocket incorporates carefully positioned shift features that help the chain move between gears under real riding loads. These features control where and how the chain engages with the next sprocket.

Accurate shifting still depends on:

Correct Full Mount derailleur installation
Compatible Road Flattop chain
Proper chain length
Current derailleur firmware
Clean drivetrain components
Suitable chain lubrication
Correctly seated rear wheel and cassette

XDR freehub compatibility

Despite adding a thirteenth sprocket, the SRAM RED XPLR XG-1391 Cassette fits the existing SRAM XDR freehub standard. The largest sprocket is positioned partly inboard towards the spokes, allowing the cassette to gain another ratio without requiring a wider freehub body.

This is valuable for riders who already own premium XDR gravel wheels because a new rear wheel or proprietary 13-speed freehub is not generally required.

The cassette does not fit directly onto Shimano HG, Microspline or standard SRAM XD freehubs.

Road Flattop chain compatibility

The cassette uses SRAM Road Flattop chain technology rather than a SRAM Eagle T-Type mountain bike chain. The distinctive flat-topped profile supports strength and clearance across the tightly spaced drivetrain.

Cassette gearing

Number of sprockets: 13
Smallest sprocket: 10T
Largest sprocket: 46T
Total range: 460 per cent
Sprocket progression: 10-11-12-13-15-17-19-21-24-28-32-38-46T

Chainring pairing

38T chainring

A 38T chainring creates the easiest climbing setup and suits steep gravel routes, loaded endurance riding and riders prioritising manageable low gears.

40T chainring

A 40T ring offers a versatile balance for hilly gravel racing and long-distance events. It provides a low 40-to-46 climbing ratio while retaining useful speed through the 10T sprocket.

42T chainring

A 42T chainring is a strong all-round racing option for mixed Australian gravel. It works well on courses combining dirt climbs, rolling country roads and fast sealed transfers.

44T chainring

The 44T option favours stronger riders and faster courses. It provides higher top-end gearing while retaining a low gear close to a one-to-one ratio.

46T chainring

A 46T ring is a speed-focused choice for flat and rolling events. Its 46-to-46 lowest ratio is one-to-one, which may be demanding on steep loose climbs.

The SRAM RED XPLR XG-1391 Cassette is best suited to competitive gravel racers and performance-focused all-road riders who want 1x simplicity without accepting large gear jumps at racing speeds.

Bikerumor introduced the SRAM RED XPLR AXS 13-speed drivetrain on 1 August 2024 and singled out its cassette as one of the most impressive individual components. The publication praised SRAM for expanding the range while creating three consecutive one-tooth jumps at the high-speed end. It also highlighted the decision to retain the established XDR freehub and Road Flattop chain rather than imposing an entirely new wheel or chain standard.

The Radavist published Josh Weinberg’s SRAM RED XPLR AXS review on 1 August 2024. The review found that the groupset successfully combined mountain-bike-derived derailleur durability with the low weight and close gearing required for modern gravel racing. The cassette’s ratio progression was viewed as central to that balance.

Routine cleaning

Clean the cassette regularly using a soft brush and bicycle-safe drivetrain cleaner.
Avoid soaking the freehub body or wheel bearings with degreaser.
Rinse gently and dry thoroughly after washing.
Do not direct high-pressure water at the cassette, freehub or hub seals.
Remove compacted mud and grass from between the sprockets.
Wipe away excess chain lubricant before it attracts gravel dust.

Chain maintenance

The cassette’s service life depends heavily on chain condition.