Shimano 105 CS-R7101 12-Speed Cassette 11-34T

Shimano 105 CS-R7101 12-Speed Cassette 11-34T

$125.00 NZD
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Shimano 105 CS-R7101 12-Speed Cassette 11-34T
  • Shimano 105 CS-R7101 12-Speed Cassette 11-34T
  • Shimano 105 CS-R7101 12-Speed Cassette 11-34T
  • Shimano 105 CS-R7101 12-Speed Cassette 11-34T
Shimano 105 CS-R7101 12-Speed Cassette 11-34T

Shimano 105 CS-R7101 12-Speed Cassette 11-34T

$125.00 NZD
Taxes included. Shipping calculated at checkout.

The 105 CS-R7101 12-Speed Cassette combines smooth road shifting, closely spaced performance ratios and a climbing-friendly 11-34T range, making it an excellent-value replacement cassette for training, racing, endurance riding and hilly road cycling.

Shimano 105 CS-R7101 12-Speed Cassette Features
  • Versatile 11-34T range provides fast road gearing with a practical low gear for steep Australian climbs.
  • Refined 12-speed progression helps riders maintain an efficient cadence across flat, rolling and mountainous terrain.
  • Compatible with Shimano 12-speed mechanical and Di2 road drivetrains.
  • Fits compatible Shimano road 11-speed and 12-speed HG freehub bodies, simplifying wheel and indoor trainer compatibility.
  • Durable steel sprockets offer strong wear resistance and affordable replacement costs.

Release Note: CS-R7100 and CS-R7101 distinction

The original Shimano 105 CS-R7100 cassette was introduced for the first 105 Di2 12-speed drivetrain. Shimano subsequently released the CS-R7101 with revised shift profiling suitable for both mechanical and Di2 12-speed road systems.

The CS-R7101 is now the more broadly compatible replacement and is the preferred option for current Shimano 105 mechanical or electronic builds. Riders replacing an original CS-R7100 on a Di2 bicycle can use the updated cassette, provided the complete drivetrain remains otherwise compatible.

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Key Features & Technical Specifications

Core specifications

  • Product type: Road bike cassette
  • Shimano series: 105 R7100
  • Model: CS-R7101-12
  • Number of speeds: 12
  • Cassette range: 11-34T
  • Total gear range: Approximately 309%
  • Individual sprocket sizes: 11, 12, 13, 14, 15, 17, 19, 21, 24, 27, 30 and 34T
  • Smallest sprocket: 11T
  • Largest sprocket: 34T
  • Sprocket material: Steel
  • Number of steel sprockets: 12
  • Spider arm: Aluminium
  • Number of aluminium spider assemblies: One
  • Lockring: Steel
  • Cassette type: Shimano HG
  • Spline standard: Shimano HG spline L2
  • Compatible chain: Shimano 12-speed HG road chain
  • Claimed average weight: 361g
  • Colour: Silver
  • Lockring included: Yes
  • Recommended lockring torque: 40Nm
  • Intended use: Road cycling, endurance riding, training, racing and maintained all-road riding

Compatibility

The Shimano 105 CS-R7101 12-Speed Cassette is designed for Shimano 12-speed road drivetrains and can be used with compatible mechanical and Di2 systems.

Compatible drivetrain examples include:

  • Shimano 105 R7100 mechanical 12-speed
  • Shimano 105 R7150 Di2 12-speed
  • Compatible Shimano Ultegra R8100 Di2 rear derailleurs
  • Compatible Shimano Dura-Ace R9200 Di2 rear derailleurs
  • Shimano RD-R7150 rear derailleur
  • Shimano 12-speed HG road chains

Freehub compatibility

The cassette is compatible with:

  • Shimano road 12-speed HG spline L2 freehub bodies
  • Most Shimano and SRAM-compatible road 11-speed HG freehub bodies
Notable Tech, Materials & Construction

Refined 12-speed gear progression

The 11-34T gearing has been designed to balance climbing range with controlled cadence changes. Five consecutive one-tooth steps at the fast end provide close ratios for bunch riding, time spent on flat roads and high-speed efforts:

  • 11 to 12T
  • 12 to 13T
  • 13 to 14T
  • 14 to 15T

The cassette then introduces progressively larger jumps through the middle and climbing sections. This keeps the cassette compact where precise cadence control matters most while still providing a useful 34T bailout gear.

Shimano HG shift profiling

Each sprocket uses carefully positioned shift ramps and shaped teeth to guide a compatible 12-speed chain between ratios. The system is designed to provide clean, predictable shifting when paired with a correctly adjusted Shimano road derailleur and chain.

The Shimano 105 cassette does not carry the complete Hyperglide+ feature specification used by Shimano’s more expensive Ultegra and Dura-Ace road cassettes. Under normal road conditions, however, its shifting remains fast and controlled, particularly when the rider briefly reduces pedal pressure during demanding shifts.

Steel sprocket construction

All 12 sprockets are made from steel. This increases weight compared with more exotic titanium or extensively machined alternatives, but it provides dependable wear resistance and helps keep replacement costs reasonable.
Size, Fit, Geometry & Measurements

Cassette gearing

  • Gear range: 11-34T
  • Total range: Approximately 309%
  • Number of sprockets: 12
  • Sprocket progression: 11-12-13-14-15-17-19-21-24-27-30-34T
  • Largest sprocket diameter: Not officially published
  • Smallest sprocket diameter: Not officially published
  • Cassette width: Designed for compatible Shimano road HG freehub bodies
  • Lockring tool interface: Standard Shimano and SRAM-compatible cassette lockring tool

Gearing with a 50-34T crankset

When combined with a Shimano 50-34T compact crankset, the 34T inner chainring and 34T largest rear sprocket produce a 1:1 lowest ratio.

This is a versatile setup for recreational road riding, endurance events, gran fondos and routes with sustained climbing. It lets the rear wheel rotate approximately once for every full crank revolution in the lowest gear.

Gearing with a 52-36T crankset

Paired with a 52-36T semi-compact crankset, the 36T inner chainring and 34T rear sprocket produce a lowest ratio of approximately 1.06:1.

This combination is better suited to stronger riders who want a higher top gear while retaining reasonable climbing capability. Riders regularly tackling extremely steep roads may prefer a 50-34T crankset or an approved 11-36T cassette.
Who it is best suited for and where it is best suited

The Shimano 105 CS-R7101 12-Speed Cassette is ideal for road cyclists who want a dependable combination of climbing range, efficient cadence control and affordable servicing.
Product Care & Warranty Info

Product care

  • Clean the cassette regularly with a soft brush and bicycle-safe drivetrain cleaner.
  • Avoid allowing degreaser to enter the freehub bearings.
  • Rinse gently and dry the cassette after cleaning.
  • Do not use a high-pressure washer around the cassette, hub or freehub body.
  • Apply chain lubricant to the chain rather than directly to the cassette.
  • Remove excess lubricant to reduce abrasive dirt accumulation.
  • Check chain wear regularly with an accurate 12-speed chain checker.
  • Consider replacing the chain at approximately 0.5% elongation to protect the cassette.
  • Inspect the cassette for hooked teeth, damaged sprockets or looseness.
  • Confirm that the lockring is tightened to 40Nm using an appropriate torque wrench.
  • Retain spacers in their correct order whenever the cassette is removed.
  • Check derailleur hanger alignment if shifting becomes inconsistent across the cassette.
  • Use a compatible Shimano 12-speed HG chain for best shifting.
  • Replace a worn chain and cassette together if a new chain skips under load.

Installation notes

The freehub body should be cleaned and lightly lubricated before installation. Grease should not be applied excessively because it can attract contamination or migrate into the hub.

The narrow master spline on each cassette component must align correctly with the freehub body. Components should slide into position without force. If a sprocket does not seat fully, its orientation and spacer arrangement should be checked.

A cassette lockring tool, chain whip and torque wrench are required for correct removal and installation. Professional bicycle servicing is recommended when the appropriate tools or mechanical experience are unavailable.

Warranty

Shimano Australia provides a two-year limited warranty for eligible Shimano bicycle components purchased new in Australia by the original retail purchaser.
Industry & Rider Feedback. A few Comparison Options

Rider discussions regularly praise the Shimano 105 cassette for delivering shifting that feels very close to Ultegra during normal road use. Owners who use a Shimano 105 cassette on an indoor trainer and an Ultegra cassette on their outdoor wheel often report only a small practical difference beyond weight and finish.

The 11-34T ratio is particularly popular with riders who want lower climbing gears without large jumps across the faster half of the cassette. The progression from 11T through 15T in one-tooth increments provides useful cadence control on fast roads, while the 27T, 30T and 34T sprockets cover most recreational climbing requirements.

Shimano Ultegra CS-R8101 11-34T

The Ultegra cassette provides the same basic 11-34T range but reduces weight through additional aluminium carrier construction and a lighter lockring. It also features Shimano’s more advanced Hyperglide+ shift profiling for smoother shifting under sustained pedalling load.

Pros:

  • Approximately 15g to 20g lighter
  • More advanced shifting under load
  • Premium finish
  • Additional aluminium carrier support

Cons:

  • Considerably more expensive
  • Similar practical gear range
  • Small real-world performance difference for many recreational riders

The Shimano 105 cassette is the better-value wear component, while Ultegra suits riders prioritising drivetrain refinement and lower weight.

SRAM Rival XG-1250 10-36T

The SRAM cassette provides a broader overall range and a 10T smallest sprocket, but it requires an XDR freehub and a compatible SRAM AXS drivetrain.

Pros:

  • Wider 360% range
  • 10T high gear
  • Strong all-road versatility

Cons:

  • Requires an XDR freehub
  • Larger ratio jumps
  • Not compatible with Shimano 12-speed road shifting
  • Different chain and drivetrain requirements

Shimano’s cassette offers tighter road ratios and compatibility with the Shimano road ecosystem. SRAM’s option favours riders who want greater range from an AXS drivetrain.
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