KMC X FLAT 12-Speed Chain – 126 Links (SRAM Flattop Systems)

The KMC X FLAT 12-Speed Chain is built specifically for modern SRAM flattop drivetrains—designed for riders running AXS and T-Type Transmission systems who want premium shifting performance, excellent durability, and a strong alternative to OEM SRAM chains.

Unlike standard 12-speed chains, the X FLAT uses KMC’s dedicated flattop profile, engineered exclusively for SRAM’s 12- and 13-speed flattop systems. This narrower profile maintains high strength while improving shift precision and chain stability under heavy load, making it ideal for aggressive trail, enduro, and full-power eMTB riding. KMC states these chains are exclusively compatible with SRAM 12-/13-speed AXS drivetrains and Transmission/T-Type systems—not older Eagle or non-flattop drivetrains.

This version comes with:

• 126 links
• KMC GO pre-waxed finish
• MissingLink included
• Nickel plated Silver or Ti-N Gold finish options

The pre-waxed treatment improves drivetrain cleanliness, reduces dirt build-up, and offers longer-lasting lubrication compared to traditional oil-based lubes. KMC also notes rewaxing does not require full dewaxing first, making ongoing maintenance much easier.

For riders on:

• SRAM GX Transmission
• Eagle 90
• X0 Transmission
• XX Transmission
• XX SL Transmission

…this is a very smart premium replacement chain.

Key Features

• Designed specifically for SRAM flattop systems
• Compatible with SRAM 12-/13-speed AXS and T-Type drivetrains
• Not compatible with older Eagle mechanical systems
• 126 links
• Includes MissingLink connector
• Waxed with KMC GO for cleaner running and reduced wear
• Size: 1/2" x 11/128"
• Nickel plated Silver or Ti-N Gold finish options
• Weight: approx. 244–262g per 110 links depending on finish
• Excellent corrosion resistance and smooth shifting under load

Torque Collective Insight

This is the KMC chain we’d recommend for modern SRAM Transmission riders.

The biggest mistake riders make is fitting the wrong chain to T-Type drivetrains.

Flat-top matters.

This gives you:

• correct Transmission compatibility
• smoother shifting under load
• excellent durability
• less drivetrain mess with waxed setup
• a premium alternative to SRAM OEM chains

For full-power eMTBs, this matters even more.

Motor torque exposes weak chains quickly.

This is a genuine “fit it properly once” option.

Fit & Sizing

Compatibility

• SRAM AXS 12-speed flattop
• SRAM Transmission / T-Type
• GX Transmission
• Eagle 90
• X0 Transmission
• XX / XX SL Transmission

Not Compatible With

• Older GX Eagle mechanical
• X01 Eagle
• XX1 Eagle
• Standard non-flattop SRAM chains
• Shimano 12-speed systems

Length

• 126 links

This is the correct chain for modern SRAM Transmission builds.