How to Install, Adjust, and Maintain the Flattop Chain for Peak Drivetrain Performance

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in Chains, SRAM

The Flattop Chain [paid link], developed by SRAM, is designed specifically for their 12-speed drivetrains, offering improved strength, efficiency, and quieter operation. Its unique flat-top shape enhances durability and allows for a narrower profile without compromising performance. However, proper installation, adjustment, and maintenance are crucial to getting the most out of this chain.

In this guide, we’ll cover everything you need to know about setting up, maintaining, and troubleshooting your Flattop Chain [paid link], ensuring it delivers optimal performance for years.

Tools Required

To install, adjust, and maintain the Flattop Chain [paid link], you’ll need:

  • Chain tool compatible with 12-speed chains
  • Quick-link pliers (for PowerLock links)
  • Torque wrench [paid link]
  • Chain wear checker
  • Chain lubricant (wax or wet/dry lube [paid link] depending on conditions)
  • Clean rags
  • Degreaser
  • Nitrile gloves (optional)

Step-by-Step Installation Guide

Proper installation is crucial to prevent premature wear and poor shifting performance. Follow these steps carefully.

1. Verify Compatibility

The Flattop Chain is specifically designed for SRAM’s 12-speed road drivetrains, such as RED eTap AXS [paid link], Force eTap AXS, and Rival eTap AXS [paid link]. It is not compatible with non-SRAM 12-speed groupsets or older 11-speed systems.

2. Determine the Correct Chain Length

A chain that is too short can damage your derailleur, while an excessively long chain causes sluggish shifting. Follow these steps to size it correctly:

  • Shift to the largest chainring and largest cassette cog (without routing through the derailleur).
  • Pull the chain tight and add two full links before marking the correct length.
  • If using a PowerLock quick link, ensure the total number of links remains an even number.

3. Cut the Chain to Size

Using a 12-speed chain tool, break the chain at the marked link. Do not use a standard 11-speed chain tool, as the pin diameter and force required differ.

4. Install the Chain

  • Route the chain through the rear derailleur pulleys, ensuring it follows the correct path.
  • Connect the ends using a SRAM PowerLock quick link.
  • Use quick-link pliers or firmly pedal forward to fully engage the link.

5. Check for Proper Tension and Alignment

  • Shift through all gears to confirm smooth movement.
  • The derailleur cage should maintain appropriate tension across the entire cassette.

How to Adjust the Flattop Chain for Optimal Performance

If your chain isn’t shifting smoothly, minor adjustments may be needed.

1. Rear Derailleur B-Screw Adjustment

The B-screw affects chain tension and the derailleur’s distance from the cassette.

  • If shifting feels slow or hesitant, adjust the B-screw to move the upper pulley slightly closer to the cassette.
  • If the chain jumps or sounds rough, increase the gap slightly.

2. Fine-Tuning Indexing

Precise indexing is key for seamless shifting.

  • Shift through the gears and listen for rubbing or hesitation.
  • If shifting is sluggish up the cassette, turn the barrel adjuster counterclockwise to increase cable tension.
  • If shifting is sluggish down the cassette, turn it clockwise to reduce tension.

3. Quick-Link Seating Check

Ensure the PowerLock quick link is fully locked in place by applying firm pedal pressure. If unsure, disconnect and reinstall.

Essential Maintenance for Long-Lasting Performance

Regular maintenance is key to maximizing the lifespan of your Flattop Chain.

1. Cleaning Routine

  • Wipe down the chain after every ride using a clean rag.
  • Use a degreaser and a chain-cleaning tool every 200-300 miles (or more often in wet conditions).
  • Avoid soaking the chain in solvents, as this can remove factory-applied lubrication.

2. Lubrication

  • Always apply lube to a clean, dry chain.
  • Use wax-based lubes for dry conditions and wet lubes for rainy or muddy rides.
  • Apply lube to the rollers while slowly backpedaling, then wipe off excess.

3. Checking for Wear

  • Use a chain wear checker every 500 miles.
  • Replace the chain when it reaches 0.5% wear to prevent excessive cassette and chainring wear.

Troubleshooting Common Issues

If you experience any issues, check the following solutions.

1. Noisy or Rough Shifting

  • Ensure the chain is clean and properly lubed.
  • Check for a misaligned quick link or stiff chain links.
  • Verify proper indexing and derailleur alignment.

2. Chain Skipping Under Load

  • Check for excessive chain wear using a wear checker.
  • Ensure the cassette and chainring teeth are not worn.
  • If a new chain skips on an old cassette, the cassette likely needs replacement.

3. Difficulty Shifting to the Largest Cog

  • Increase cable tension by turning the barrel adjuster counterclockwise.
  • Verify the derailleur hanger is not bent.

4. Chain Falls Off Chainring

  • Ensure the chainline is correct and the front derailleur is adjusted properly.
  • If using a 1x setup, consider a narrow-wide chainring or clutch-equipped derailleur.

Comparing the Flattop Chain to Other 12-Speed Chains

The Flattop Chain offers several advantages over traditional 12-speed chains:

FeatureFlattop ChainStandard 12-Speed Chain
Durability High Moderate
Noise Reduction Quieter Slightly louder
Efficiency Improved Standard
Compatibility SRAM-only More universal

While the Flattop Chain is excellent for SRAM AXS drivetrains, it is not compatible with Shimano or Campagnolo 12-speed systems.

Final Thoughts

The Flattop Chain is a high-performance, durable chain designed specifically for SRAM’s 12-speed road groupsets. Proper installation, adjustment, and maintenance ensure smooth shifting and longevity. By keeping your chain clean, correctly tensioned, and well-lubricated, you can maximize your drivetrain’s efficiency and lifespan.