Troubleshooting Shimano FC-6700 Chainring: How to Fix Shifting and Wear Issues

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The Shimano FC-6700 [paid link] is a high-quality, lightweight chainring designed for serious cyclists looking to optimize their drivetrain performance. However, even the best components can develop issues over time, especially with frequent use. Understanding how to troubleshoot and fix common shifting and wear problems with the Shimano FC-6700 [paid link] can help extend the lifespan of your chainring and ensure a smoother ride.

Common Shifting Issues and Solutions

Shifting problems are one of the most common issues riders face with the Shimano FC-6700 [paid link] chainring. These problems can manifest as rough shifting, skipping gears, or chain drops. Several factors can contribute to these shifting issues, but with a systematic approach, most can be fixed with a few adjustments.

1. Misaligned Front Derailleur

If your front derailleur is misaligned, it may cause the chain to drop off the chainring or fail to shift properly.

Solution:

  • Ensure the front derailleur is positioned correctly. The derailleur should be parallel to the chainrings and positioned about 2-3 mm above the largest chainring.
  • Check that the derailleur cage is not rubbing against the chain, especially in the smallest and largest gears.
  • Adjust the derailleur limit screws to ensure the derailleur moves smoothly between the gears without overshooting.

2. Cable Tension Issues

Inadequate or excessive cable tension can lead to poor shifting performance.

Solution:

  • Check the cable tension by shifting to the largest chainring and observing how the derailleur reacts. If the derailleur struggles to shift up, it may be due to too little cable tension.
  • Adjust the barrel adjuster on the front derailleur to fine-tune cable tension. Turning the barrel adjuster counterclockwise increases tension, while turning it clockwise reduces it.
  • If necessary, replace the cable if it’s frayed or showing signs of wear.

3. Chain Wear or Dirty Chain

A worn or dirty chain can hinder shifting performance and accelerate wear on the Shimano FC-6700 chainring.

Solution:

  • Clean your chain regularly using a degreaser to remove grime and buildup. This will ensure smooth movement over the chainring teeth.
  • Check the chain for wear by measuring its elongation using a chain checker tool. If the chain has stretched beyond its recommended limit, it’s time for a replacement.

4. Incorrect Chainring Size

Using a chainring size that doesn’t match your riding style or drivetrain setup can result in poor shifting and discomfort.

Solution:

  • Make sure the Shimano FC-6700 chainring size is appropriate for your gear ratios. If you’re frequently missing shifts, switching to a larger or smaller chainring may resolve the issue.
  • Ensure your crankset is compatible with the selected chainring size. The FC-6700 is designed to work with Shimano 10-speed drivetrains, so be sure to confirm compatibility with your bike’s system.

Wear and Tear on the Chainring

Over time, the Shimano FC-6700 chainring can show signs of wear, especially if it’s been subjected to harsh riding conditions. The most common signs of wear include tooth wear, ovalization, or cracking. Let’s dive into the solutions to these issues.

1. Worn Teeth

The teeth of the chainring can wear down from prolonged use, which can cause chain slipping, poor shifting, or even chain drops.

Solution:

  • Inspect the teeth regularly for signs of wear, such as rounded edges or visible grooves.
  • If the teeth are heavily worn, it’s time to replace the chainring. You can opt for a direct replacement with the Shimano FC-6700 or consider upgrading to a higher-end chainring for better performance.

2. Ovalization of the Chainring

Over time, the Shimano FC-6700 chainring can become ovalized due to excessive load or poor maintenance. Ovalization leads to inconsistent pedal strokes, causing a loss of power and efficiency.

Solution:

  • Check for any signs of ovalization by measuring the chainring at several points using a caliper. If the deviation is noticeable, it may be time for a replacement.
  • Consider switching to an oval chainring if you prefer more efficient pedaling mechanics. Brands like Wolf Tooth offer oval chainrings that are compatible with Shimano drivetrains, though you must ensure compatibility before purchasing.

3. Cracking or Deep Scratches

Cracks or deep scratches in the chainring can compromise the structural integrity of the Shimano FC-6700, leading to potential failure during use.

Solution:

  • Examine the chainring closely for any cracks or deep scratches. If you find any, replace the chainring immediately to avoid injury or further damage to the drivetrain.

Preventative Maintenance for Longevity

Regular maintenance is key to ensuring that your Shimano FC-6700 chainring performs well and lasts as long as possible. Here are some essential maintenance practices that will help prevent shifting issues and wear:

1. Regular Cleaning and Lubrication

Keeping the chainring clean and lubricated is crucial for optimal performance. Dirt and grime can increase friction and cause wear on both the chainring and chain.

Solution:

  • Clean the chainring regularly with a degreaser and wipe down any dirt or debris. Use a brush to clean between the teeth.
  • Apply a light lubricant to the chainring to reduce friction and protect it from rust. Be sure to wipe off any excess to avoid attracting more dirt.

2. Periodic Inspections

Even if you’re not experiencing any issues, it’s important to inspect your Shimano FC-6700 chainring periodically.

Solution:

  • Look for signs of wear such as tooth damage or chainring ovalization.
  • Check the bolts and tighten them if necessary. Loose bolts can cause poor shifting and even damage the chainring.

Conclusion

Troubleshooting shifting and wear issues on the Shimano FC-6700 chainring is a relatively straightforward process if you follow a systematic approach. Start by checking the front derailleur alignment, cable tension, and chain condition. For wear-related problems like tooth wear or ovalization, regular inspections and maintenance will help you address these issues before they lead to complete chainring failure. By maintaining your Shimano FC-6700 properly, you can keep your drivetrain running smoothly and ensure a long lifespan for your chainring.