CS-6700 Cassette vs. CS-R7000: Key Differences Every Cyclist Should Know

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The Shimano CS-6700 [paid link] cassette, a part of the 10-speed Ultegra series, has been a mainstay in high-performance road drivetrains for over a decade. With the release of the CS-R7000 [paid link] cassette, Shimano’s updated 105-series 11-speed drivetrain has presented riders with a more modern, budget-friendly option. But how do these two cassettes stack up when examined head-to-head?

This article dissects the CS-6700 [paid link] vs. CS-R7000 [paid link] comparison in full detail—from compatibility and construction to shifting performance and long-term value—so you can determine the better fit for your bike and riding needs.

Design and Material Differences

At a glance, both cassettes reflect Shimano’s engineering quality, but the CS-6700 [paid link] leans toward premium design while the CS-R7000 [paid link] offers trickle-down tech at a mid-tier price.

The CS-6700 uses a combination of steel sprockets and an aluminum spider arm, which helps reduce weight and improve stiffness. In contrast, the CS-R7000 cassette maintains a full-steel sprocket setup across most gear ranges, which adds durability but slightly increases weight.

Notably, the CS-6700’s three largest cogs are mounted on a composite alloy carrier. This setup reduces flex under high torque and maintains precise gear spacing, contributing to consistent shifting under load. The CS-R7000 uses a similar construction in higher-spec versions (e.g., the 11-30T), but this feature is not standardized across all configurations.

Weight Comparison

Weight differences matter for riders focused on performance and climbing efficiency. Here’s a direct comparison based on similar gearing:

  • CS-6700 11-28T: ~208 grams
  • CS-R7000 11-28T: ~284 grams

The CS-6700’s lighter weight stems from its alloy carrier and more compact 10-speed spacing. For riders where grams matter, such as competitive racers or climbers, the CS-6700 holds a distinct advantage.

Shifting Performance

Shimano’s shifting reputation is rooted in precision and reliability, but gear spacing and chain interface greatly influence feel.

  • CS-6700: Optimized for 10-speed drivetrains. The tighter spacing between sprockets results in crisp, mechanical shifts. However, it requires a specific 10-speed chain and compatible derailleur setup.
  • CS-R7000: Designed for 11-speed systems. While shifts are slightly wider spaced, they are smoother and quieter due to advancements in tooth profiling and chain compatibility.

In practice, the CS-6700 delivers a more tactile shift, especially appreciated in racing or aggressive riding. The CS-R7000, however, provides a more seamless experience for endurance and touring cyclists.

Drivetrain Compatibility

CS-6700 Compatibility:

  • Pairs with Shimano 10-speed systems (Ultegra 6700, 105 5700, Tiagra 4600)
  • Requires a 10-speed specific freehub body
  • Only compatible with 10-speed chains

CS-R7000 Compatibility:

  • Designed for Shimano 11-speed systems (105 R7000, Ultegra R8000, Dura-Ace R9100)
  • Fits standard 11-speed Shimano road freehubs
  • Works exclusively with 11-speed chains

If you’re running an older 10-speed setup, retrofitting to the CS-R7000 requires more than a cassette swap. You’ll need a new freehub body, chain, and potentially derailleurs—adding cost and complexity.

Gear Range Options

  • CS-6700: Typically available in 11-23T to 12-30T. Suited for fast, flat roads and rolling terrain. Limited options for steep climbing.
  • CS-R7000: Wider range, from 11-25T to 11-34T. The 11-34T version allows compatibility with medium cage rear derailleurs, ideal for hilly or loaded touring.

The CS-R7000 offers more gearing versatility, which is a major consideration for riders tackling variable terrain or looking for a compact climbing setup.

Price and Value

As of 2025, the CS-6700 has become increasingly difficult to find as it’s no longer in production. Prices can be inflated due to scarcity, especially for new-in-box models. However, its premium materials and race-proven performance justify its higher cost for enthusiasts who prioritize performance.

The CS-R7000, by contrast, is widely available, more affordable, and benefits from current Shimano production cycles. For budget-conscious riders or newer cyclists, it’s a solid choice with modern features.

Which One Should You Choose?

Choose the CS-6700 if:

  • You ride a 10-speed Shimano drivetrain and want to maintain compatibility.
  • You prioritize weight savings and crisp, race-style shifting.
  • You already own a 10-speed groupset and don’t want to overhaul the drivetrain.

Choose the CS-R7000 if:

  • You’re building or upgrading to an 11-speed system.
  • You prefer smoother shifting with a wider gear range.
  • You want readily available, cost-effective replacement options.

Frequently Asked Questions (FAQs)

Q1: Can I use a CS-6700 cassette on an 11-speed bike?
No. The CS-6700 is specifically designed for 10-speed drivetrains and is not compatible with 11-speed systems due to spacing and freehub differences.

Q2: Is there a big performance difference between CS-6700 and CS-R7000?
Yes, in certain scenarios. The CS-6700 offers more precise mechanical shifts, while the CS-R7000 provides smoother, more forgiving transitions ideal for endurance riding.

Q3: Will an 11-speed chain work with the CS-6700 cassette?
No. The CS-6700 requires a 10-speed chain to function properly. Mixing chains and cassettes from different speed groups compromises shifting quality.

Q4: Which cassette is better for climbing?
The CS-R7000 offers wider gear ranges (up to 34T), making it a better choice for steep climbs or touring setups.

Q5: Can I upgrade from CS-6700 to CS-R7000 easily?
Not directly. You’ll need a new freehub, 11-speed shifters, chain, and potentially derailleurs to make the switch.

Q6: Is the CS-6700 still available to buy new?
It’s becoming rare. You might find NOS (New Old Stock) from specialty retailers, but availability is limited as Shimano has phased it out.

Conclusion

The Shimano CS-6700 cassette remains a beloved component for 10-speed performance setups, while the CS-R7000 cassette carries the torch forward for 11-speed drivetrains. Each brings its own set of strengths—whether it’s the lighter, stiffer, race-ready feel of the CS-6700 or the accessible, wide-ranging versatility of the CS-R7000.

Making the right choice hinges on your current drivetrain, performance priorities, and future upgrade plans. For legacy systems, the CS-6700 is hard to beat. But for most modern riders, the CS-R7000 offers a smarter long-term investment.