











SRAM AXS Ultralight Carbon Rear Derailleur Upgrade Kit | D1 & E1 Compatible | Save up to 100g
📌 Product Description
The SRAM AXS Ultralight Carbon Upgrade Kit is designed for riders chasing every gram. All structural components are crafted from premium prepreg carbon, molded at 20,000 psi, delivering strength equal to OEM parts with a major reduction in weight.
A full conversion saves up to ~100 g, bringing total derailleur weight down to ~210 g in optimized builds. Because Force and Red (D1/E1) share identical motor units, you can repurpose a Force derailleur into a build lighter than Red OEM at a fraction of the cost.
33T and 36T cages are available (36T body shipping end of year). D1 versions are directly compatible with 36T cassettes for expanded range setups.
🔥 Highlights
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Massive Weight Savings: Full upgrade reduces weight by up to ~100 g. Lightest builds as low as ~210 g (Red/Force E1).
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Premium Carbon Construction: Made from top-grade prepreg carbon, formed under 20,000 psi pressure, ensuring stiffness and durability equal to OEM.
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Broad Compatibility: Supports SRAM AXS D1 & E1 platforms (Red, Force, Rival, including XPLR).
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Modular Options: Choose from 33T / 36T cages, inner & outer arms, link plates, or the complete kit.
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Smart Upgrade Path: Force and Red (D1/E1) share the same motor – build a superlight RD from a used Force unit, lighter than stock Red!
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36T Ready: 36T main cage expected by year-end; D1 versions are directly compatible with 36T cassettes.
📌 Compatibility (Upgradeable RDs)
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Red D1 AXS: ~298 g ➝ ~235 g
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Force D1 AXS: ~335 g ➝ ~235 g
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Rival D1 AXS: supported (target ~245–255 g depending on setup)
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Force D1 XPLR: supported (33T/36T options)
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Red E1 AXS: ~282 g ➝ ~220 g
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Force E1 AXS: ~310 g ➝ ~220 g
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Rival E1 AXS: ~330 g ➝ ~240 g
Note: final weight varies depending on configuration, pulley wheels, and hardware choices.
Compatibility Check: Due to the complexity of original equipment manufacturer (OEM) parts' models and batches, there may be instances where this product is incompatible.
Upon receiving this product, please compare it with the OEM specifications to ensure compatibility before installation.
Torque Specifications: Install this product strictly according to the torque values specified in the OEM parts manual.Installation Issues: If you encounter any discrepancies with the OEM specifications or face difficulties at the initial stage of installation, stop immediately and contact customer service for assistance with returns or exchanges.
No Forced Installation: Do not force installation under any circumstances.Liability: Any damages resulting from forced installation or unauthorized modifications of this product (or its components) will be the sole responsibility of the buyer.
All products are photographed to accurately represent the colors you will see upon receipt.
Due to differences in lighting, angles, or screen settings, slight color variations may occur.
The actual product should be considered the standard.For "colored" and "blue" products, the coloring process may result in uneven color distribution, making each product unique.
S-PARTS Common Torque Reference Table for Bicycle Series | ||||||
Ingredient | Component Name | Screw Name | Reference Torque | Anti-seize Usage | Medium-strength Threadlocker Usage | Special Requirements Remarks |
Frame System | Handlebar Assembly | M4 Stem Fixing Screws | 4NM | Recommended | Consider with Caution | For special structure handlebar assemblies, please refer to the original manufacturer's recommended torque specifications. |
M5 Stem Fixing Screws | 5NM | Recommended | Consider with Caution | |||
M6 Stem Fixing Screws | 6-8NM | Recommended | Consider with Caution | |||
M7 Handlebar Fixing Screws (Brompton) | 8-10NM | Recommended | Consider with Caution | |||
M8 Stem Fixing Screws (BMX) | 8-10NM | Recommended | Consider with Caution | |||
Headset | Headset Preload Screws (including M5/M6) | 4-6NM | Recommended | Not Recommended | ||
Frame/Fork | M3 Fork Hose Clamp Screws | 1-2NM | Recommended | Not Recommended | For special structure seatpost clamps, please refer to the original manufacturer's recommended torque specifications. | |
Water Bottle Cage Screws | 4NMM | Recommended | Not Recommended | |||
M4 Derailleur Hanger Fixing Screws | 3-4NM | Recommended | Consider with Caution | |||
M5 Derailleur Hanger Fixing Screws | 4-5NM | Recommended | Consider with Caution | |||
M5 Front and Rear Rack Fixing Screws | 6-7NM | Recommended | Consider with Caution | |||
M5 Seatpost Clamp Screw (Standard Clamp Design) | 6-7NM | Recommended | Not Recommended | |||
Seatpost | M5 Saddle Rail Clamp Screws | 6-7NM | Recommended | Not Recommended | ||
M6 Saddle Rail Clamp Screws | 7-9NM | Recommended | Not Recommended | |||
M7 Saddle Rail Clamp Screws | 8-10NM | Recommended | Not Recommended | |||
M6/M7 Single-Bolt Saddle Rail Clamp Screws | 10-12NM | Recommended | Not Recommended | |||
M8 Single-Bolt Saddle Rail Clamp Screws (Brompton) | 12-14NM | Recommended | Not Recommended | |||
Wheelset | M6 Quick-Release Wheelset Locking Screws | 6-8NM | Recommended | Not Recommended | ||
M10 BMX Wheelset Locking Screws | Recommended | Not Recommended | ||||
M14 BMX Wheelset Screws | Recommended | Not Recommended | ||||
M9 Wheelset Locking Nuts | 12-14NM | Recommended | Not Recommended | |||
M10 Wheelset Locking Nuts | 14-16NM | Recommended | Not Recommended | |||
M12 Thru-Axle Bolt | 10-14NM | Recommended | Not Recommended | |||
M14 Thru-Axle Bolt | 12-16NM | Recommended | Not Recommended | |||
Brake System | Disc Rotor | Six-Bolt Disc Rotor Screws | 5-7NM | Consider with Caution | Recommended | Do not use anti-seize compounds or liquid thread lockers on screws related to the brake hydraulic system to avoid contaminating the hydraulic lines. |
Center Lock Disc Rotor | 40NM | Recommended | Not Recommended | |||
Brake Lever | M5 Brake Lever Fixing Screws | 5-7NM | Recommended | Not Recommended | ||
M6 Brake Lever Fixing Screws | 6-8NM | Recommended | Not Recommended | |||
Road Bike Shifter Fixing Nuts | 6-8NM | Recommended | Not Recommended | |||
Brake Lever Bleed Port Screws | 2-3NM | Not Recommended | Recommended | |||
Disc Brake Caliper | M6 Mountain Bike Caliper Fixing Screws | 9NM | Consider with Caution | Recommended | ||
M5 Flat Mount Caliper Fixing Screws | 7NM | Consider with Caution | Not Recommended | |||
M8 Hose Compression Fitting Screws | 6-7NM | Not Recommended | Not Recommended | |||
M6 Caliper Body Screws | 12NM | Not Recommended | Not Recommended | |||
M7 Caliper Body Screws | 14NM | Not Recommended | Not Recommended | |||
M8 Caliper Body Screws | 14NM | Not Recommended | Not Recommended | |||
M6 Caliper Banjo Screws | 12NM | Not Recommended | Not Recommended | |||
Caliper Bleed Screws | 5-6NM | Not Recommended | Not Recommended | |||
Brake Pad Pin | 3NM | Not Recommended | Not Recommended | |||
C-Brake Caliper | Single Pivot Caliper Fixing Nut | 8NM | Not Recommended | Recommended | ||
Dual Pivot Caliper Fixing Screws | 6-8NM | Consider with Caution | Consider with Caution | |||
Brake Pad Fixing Screw Set | 7NM | Consider with Caution | Consider with Caution | |||
Brake Pad Stop Screws | 3NM | Not Recommended | Not Recommended | |||
Caliper Release Lever Screws | 3NM | Not Recommended | Not Recommended | |||
Cable Anchor Screws | 5-7NM | Recommended | Not Recommended | |||
Drivetrain System | Shifter | Shifter Clamp Bolt | 4-6NM | Recommended | Not Recommended | Do not use anti-seize compounds or liquid thread lockers on screws related to the brake hydraulic system to avoid contaminating the hydraulic lines. |
Shifter Integration Bolt | 4-6NM | Recommended | Not Recommended | |||
Shifter Top Cap Bolt (Shimano) | 4NM | Recommended | Not Recommended | |||
Front Derailleur | Direct Mount Front Derailleur Fixing Bolt | 6-7NM | Recommended | Not Recommended | ||
Front Derailleur Clamp Bolt | 5-7NM | Recommended | Not Recommended | |||
Front Derailleur Cable Adjusting Bolt | 5-7NM | Recommended | Not Recommended | |||
Rear Derailleur | Rear Derailleur Pivot | 10-12NM | Recommended | Not Recommended | ||
UDH System Rear Derailleur Pivot | 25NM | Recommended | Not Recommended | |||
M4 Pulley Bolt | 3NM | Consider with Caution | Consider with Caution | |||
M5 Pulley Bolt | 4NM | Consider with Caution | Consider with Caution | |||
M3 Rear Derailleur Lock Cover Bolt (Shimano) | 1.5NM | Not Recommended | Not Recommended | |||
Rear Derailleur Cable Adjusting Bolt | 5-7NM | Recommended | Not Recommended | |||
Crankset | Chainring Double-Sided Bolt | 6-8NM | Consider with Caution | Consider with Caution | ||
Single Chainring Bolt | 8NM | Consider with Caution | Consider with Caution | |||
M5 Crank Arm Bolt (SRAM 3-bolt) | 7NM | Consider with Caution | Consider with Caution | |||
M4 Crank Arm Bolt (SRAM 8-bolt) | 4-5NM | Consider with Caution | Consider with Caution | |||
M6 Crank Arm Fixing Bolt (Shimano) | 12-14NM | Consider with Caution | Consider with Caution | |||
Crank Arm Cap (Shimano) | 2-4NM | Not Recommended | Not Recommended | |||
Crank Arm Fixing Bolt (DUB) | 54NM | Recommended | Not Recommended | |||
Crank Arm Fixing Bolt (Rotor) | 30-35NM | Recommended | Not Recommended | |||
Crank Arm Fixing Bolt (EE) | 52NM | Recommended | Not Recommended | |||
M8 Square Taper Crank Bolt | 30NM | Recommended | Not Recommended | |||
Pedals | Pedal Axle | 25NM | Recommended | Not Recommended | ||
Road Cleat Fixing Bolt (3-bolt) | 6-8NM | Not Recommended | Recommended | |||
MTB Cleat Fixing Bolt (2-bolt) | 8NM | Not Recommended | Recommended |