Both derailleurs for a 2x AXS build, in one box.

Rival AXS rear derailleur and Rival AXS front derailleur — the two components that turn a set of AXS levers into a working wireless drivetrain. No cables, no housing, no indexing to drift out over a season.

Batteries and charger are not included. You'll need two AXS batteries, one for each derailleur.

How eTap shifting works

If you've never ridden AXS, the logic takes about thirty seconds to learn and then disappears:

• Right paddle — harder gear
• Left paddle — easier gear
• Both at once — shifts the front derailleur

No tension to set, no barrel adjuster to chase, no cable stretching over the first hundred miles. The derailleurs listen for the levers and move to positions they already know. Every shift is the same shift, whether it's the first ride or the two-hundredth.

The rear derailleur

Handles cassettes from 10-28T to 10-36T, on 1x or 2x, with chain damping that keeps things quiet over broken pavement and secure on rough surfaces.

A wide-range drivetrain puts real slack into the system at the small-cog end, and slack becomes chain slap and dropped chains. The cage is damped against that motion — enough to hold the chain settled, not so much that shifts get slow or the chain fights you climbing the cassette.

Range limit: 36T maximum, 28T minimum. Anything larger needs an XPLR derailleur. A 13-speed cassette needs a 13-speed XPLR derailleur.

The front derailleur

Front shifting is where most drivetrains still feel mechanical, and it's the shift people learn to avoid under load. This one is built to fix that.

Yaw cage rotation. Instead of moving straight sideways, the cage rotates as it moves, keeping a consistent angle to the chain across the whole cassette. That's what eliminates trim — the cage is already at the right angle whether you're in the 10 or the 36.

Auto trim. On top of the Yaw geometry, the derailleur makes its own micro-adjustments as you move across the rear cassette. No rasp, no rubbing, nothing for you to manage.

A narrower cage shaped specifically around X-Range chainring profiles, which shortens the distance the chain has to travel and makes the shift itself faster and cleaner.

A setup tool is included, which takes the guesswork out of getting cage height and rotation right — historically the fiddliest part of any front derailleur install.

Fitment — read before ordering

The rear derailleur is flexible. The front derailleur has three hard constraints.

1. Braze-on mount. This is the braze-on version. Your frame needs a braze-on tab on the seat tube. If your frame doesn't have one, you'll need a separate clamp adapter in 31.8mm or 34.9mm, sold separately.

2. 45mm chainline, 2x only. It's built for a standard road chainline and 46/33T, 48/35T, or 50/37T chainring combinations. It will not work with a Wide 47.5mm chainline crankset — that needs a Wide-specific front derailleur — and it obviously won't work on a 1x build.

3. Chainstay angle between 61 and 66 degrees. Most road frames fall inside this. Some gravel and long-chainstay frames don't. Your frame manufacturer publishes it.

AXS app

Pair both derailleurs to the SRAM AXS app and you can check battery levels on each, reassign what every control does, get service reminders, and push firmware updates.

Sequential shifting is the feature worth setting up on a 2x build. Turn it on and the system manages the front derailleur for you — you keep pressing the same paddle, and it decides when to move the chain across the front and compensate at the rear to keep the gear progression smooth. It makes a 2x drivetrain feel like a 1x with more gears in it.

Batteries

You need two AXS batteries and a charger. Neither is included.

They're interchangeable front to rear, which is genuinely useful: if the rear derailleur dies mid-ride, pull the front battery and swap it back. You lose front shifting and finish the ride with a working rear.

The shift levers are a separate system — they run CR2032 coin cells that last years, not rides.

Carrying a spare battery in a jersey pocket is cheap insurance. It swaps in about five seconds with no tools.

Mixing tiers

Every AXS component speaks the same wireless protocol, so you can mix freely. These derailleurs work behind RED or Force levers. A RED cassette runs fine on a Rival drivetrain.

Rival is where most people should spend the least in an AXS build — the shifting is functionally identical to the tiers above, and the difference is materials and grams. Put the savings into wheels.

You will need a SRAM Flattop chain

SRAM's 12-speed road drivetrains use Flattop chains, a different design from standard 12-speed chains. A Shimano 12-speed chain will not work. A SRAM Eagle chain will not work. A generic 12-speed chain will not work.

Compatible: SRAM Road Flattop D1 or Road Flattop E1.

What you'll still need

• Two AXS batteries and a charger — not included
• SRAM Road Flattop chain, D1 or E1
• A 12-speed cassette between 10-28T and 10-36T
• A 2x crankset in 46/33T, 48/35T, or 50/37T with a 45mm chainline
• AXS shift-brake levers or controls
• A braze-on tab on your frame, or a clamp adapter
• A standard derailleur hanger for the rear

What's in the pack

• Rival AXS rear derailleur, max 36T (PN 00.7518.191.000)
• Rival AXS front derailleur, braze-on (PN 00.7618.183.000)
• Front derailleur setup tool
• Mounting hardware

Specifications

Rear derailleur

• Model: RD-RIV-E-E1
• Speeds: 12
• Max cog: 36T  |  Min cog (large): 28T
• Drivetrain: 1x, 2x
• Cage material: Aluminum
• Pulley bearings: Steel
• Mounting: Standard derailleur hanger
• Color: Black / Grey

Front derailleur

• Model: FD-RIV-E-E1
• Speeds: 12
• Drivetrain: 2x
• Chainring compatibility: 46/33T, 48/35T, 50/37T
• Chainline: 45.0mm
• Mounting: Braze-on
• Chainstay angle: 61-66 degrees
• Shift technology: Yaw with auto trim
• Color: Black

Both

• Protocol: AXS wireless
• Chain technology: Road Flattop D1, Road Flattop E1
• Batteries: Not included

Installation

Bolt the rear derailleur to the hanger, set limit screws and B-gap per SRAM's procedure, install batteries, and press the AXS button on each component to pair. Pairing takes about a minute and doesn't need the app, though the app is worth setting up anyway.

For the front derailleur, use the included setup tool. Cage height and rotation are the two things people get wrong, and the tool removes the guesswork from both.

Check your hanger alignment first. The rear derailleur hangs off a replaceable hanger like any conventional derailleur, and a bent hanger makes a perfectly good electronic drivetrain shift badly. A hanger alignment gauge is the cheapest fix for a problem people usually blame on the derailleur.

Full documentation and torque values are in SRAM's service hub — rear derailleur and front derailleur.

OE product information

Not intended for retail sale. This is original-equipment product supplied for dealer service, warranty replacement, and complete-bike build applications.

OE product is the same component that ships on complete bikes — identical specification, identical performance. What differs is how it's supplied:

• Plain bulk or poly packaging rather than a retail box
• No printed manuals or quick-start guides — all documentation is available free from SRAM's service hub, linked above
• No retail hang tags or display materials
• Small-parts and hardware content may differ from the retail pack
• Components may show minor handling marks from bulk packing

Warranty. SRAM's consumer warranty program does not apply to original-equipment components. Warranty and defect claims on this item are administered by State Bicycle Co. Contact our support team with your order number. Crash damage, wear items, and installation damage are not covered.

Original equipment service item. Supplied in OE packaging for dealer service, warranty replacement, and complete-bike build applications; not a retail-packaged consumer product and not intended for retail sale. SRAM consumer warranty does not apply to original-equipment components — warranty administration on this item is provided by State Bicycle Co. AXS batteries and charger are not included; two batteries are required. Front derailleur is braze-on mount and requires a 45mm chainline 2x crankset. Requires a SRAM Road Flattop chain. Professional installation recommended. SRAM, Rival, AXS, eTap, Yaw, XPLR, X-Range, and Flattop are trademarks of SRAM LLC. State Bicycle Co. is not affiliated with or endorsed by SRAM LLC. Specifications subject to change without notice.