Shimano Ultegra FC-R8100 Crankset – 12-Speed Hollowtech II

Shimano Ultegra FC-R8100 Crankset – 12-Speed Hollowtech II

160 / 50/34T
$329.99 AUD
Sale price  $329.99 AUD Regular price 
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Shimano Ultegra FC-R8100 Crankset – 12-Speed Hollowtech II

Shimano Ultegra FC-R8100 Crankset – 12-Speed Hollowtech II

$329.99 AUD
Sale price  $329.99 AUD Regular price 
Taxes included. Shipping calculated at checkout.

The Shimano Ultegra FC-R8100 crankset delivers premium 12-speed road performance, combining efficient power transfer, low weight, smooth front shifting and excellent long-term reliability, making it a smart upgrade for Brisbane and Australian cyclists wanting near Dura-Ace performance at better value.

FC-R8100 Features

  • Premium Shimano Ultegra 12-speed road crankset for performance road bikes
  • Hollowtech II crank arm construction balances stiffness, strength and low weight
  • Hollowglide chainrings improve front shifting and power transfer
  • Available in 46/36T, 50/34T and 52/36T chainring combinations
  • Wide crank length range from 160mm to 175mm for improved bike fit options
Crank Arm Length (mm)
Chainring Combination
Key Features & Technical Specifications

Technical Specifications

  • Product Name: Shimano Ultegra FC-R8100 Crankset
  • Model: FC-R8100
  • Series: Shimano Ultegra R8100
  • Drivetrain Type: 2x12-speed road
  • Rear Speeds: 12-speed
  • Compatible Chain: Shimano HG 12-speed
  • Crank Arm Technology: Hollowtech II
  • Chainring Technology: Hollowglide
  • Chain Line: 44.5mm
  • PCD / BCD: 110mm
  • Spider / Gear Arms: 4-arm asymmetric design
  • Q-Factor: 148mm
  • Chainring Combinations: 46/36T, 50/34T, 52/36T
  • Crank Arm Lengths: 160mm, 165mm, 170mm, 172.5mm, 175mm
  • Average Weight:46/36T: approximately 702g50/34T: approximately 700g52/36T: approximately 711g
  • Crank Fixing Screw: Included
  • Colour: Shimano Ultegra series finish
  • Bottom Bracket Compatibility: Shimano Hollowtech II 24mm spindle bottom bracket systems
  • Compatible Bike Type: Road bikes, aero road bikes, endurance road bikes and race bikes
  • Recommended Use: Road cycling, climbing, fast bunch rides, endurance riding, racing and Gran Fondo events
  • Power Meter: Not included; Shimano FC-R8100-P is the integrated power meter version
Notable Tech, Materials & Construction

Hollowtech II Crank Arm Construction

Shimano Hollowtech II technology uses hollow forged crank arms to deliver an excellent balance of stiffness, strength and low weight. This improves pedalling efficiency, acceleration and climbing response.

Integrated 24mm Spindle

The right crank arm integrates with Shimano’s proven 24mm spindle system, helping maintain stiffness while keeping bottom bracket compatibility simple and reliable.

Hollowglide Chainrings

The Hollowglide outer chainring uses a hollow structure that reduces weight while maintaining rigidity. This helps improve front shifting accuracy, especially under load.

12-Speed Optimised Shifting

The FC-R8100 chainrings are designed specifically for Shimano 12-speed road drivetrains, improving chain engagement, front derailleur performance and overall drivetrain smoothness.

Asymmetric 4-Arm Design

The 4-arm spider places material where it is needed most for pedalling loads, improving stiffness while reducing unnecessary weight.

Size, Fit, Geometry & Measurements

Available Chainring Options

46/36T

  • Best for cyclocross-style gearing, junior racing or riders wanting tighter gear spacing
  • Less common for general road use but useful for specific performance setups

50/34T

  • Best all-round option for climbing, endurance riding and mixed terrain
  • Excellent for Brisbane and Queensland riders tackling Mt Coot-tha, Mount Nebo and hinterland climbs

52/36T

  • Best for faster road riding, racing and strong riders wanting more top-end speed
  • Ideal for fast bunch rides, criteriums and flatter road events

Available Crank Lengths

  • 160mm
  • 165mm
  • 170mm
  • 172.5mm
  • 175mm

Fit Recommendation

Shorter crank options such as 160mm and 165mm are useful for smaller riders, triathletes, aero-position riders or cyclists seeking improved hip clearance and higher cadence efficiency.

Who it is best suited for and How it performs in local conductions

Best Suited For

  • Road cyclists upgrading to Shimano 12-speed
  • Ultegra Di2 and mechanical drivetrain riders
  • Endurance riders
  • Club racers and fast bunch ride cyclists
  • Riders replacing a worn or damaged crankset
  • Cyclists building a premium road bike without Dura-Ace pricing
  • Brisbane riders searching for Shimano road bike parts or drivetrain upgrades
Industry Feedback, Rider Reviews and our own opinion

Bikerumor’s January 2024 long-term review of Shimano Ultegra R8100 praised the groupset for smooth operation, quiet running, reliable shifting and strong durability after extended use.

Cyclists Hub’s updated April 2026 review of Shimano Ultegra R8100 also praised the platform for excellent shifting, braking performance, reliability and long battery life after more than 5,000km of riding.

Hands On Bike’s September 2023 comparison of Dura-Ace R9200 and Ultegra R8100 cranksets highlighted how closely the Ultegra crankset compares to Dura-Ace in construction and overall function, while offering a more accessible price.

Rider Feedback & Community Sentiment

Rider feedback around the FC-R8100 crankset is generally very positive.

Common positive comments include:

  • Excellent stiffness under load
  • Smooth and reliable front shifting
  • Strong value compared with Dura-Ace
  • Premium appearance and finish
  • Proven Shimano Hollowtech II bottom bracket compatibility
  • Wide crank length options
  • Reliable long-term performance
Product Care & Warranty Info

Bikerumor’s January 2024 long-term review of Shimano Ultegra R8100 praised the groupset for smooth operation, quiet running, reliable shifting and strong durability after extended use.

Cyclists Hub’s updated April 2026 review of Shimano Ultegra R8100 also praised the platform for excellent shifting, braking performance, reliability and long battery life after more than 5,000km of riding.

Hands On Bike’s September 2023 comparison of Dura-Ace R9200 and Ultegra R8100 cranksets highlighted how closely the Ultegra crankset compares to Dura-Ace in construction and overall function, while offering a more accessible price.

Rider Feedback & Community Sentiment

Rider feedback around the FC-R8100 crankset is generally very positive.

Common positive comments include:

  • Excellent stiffness under load
  • Smooth and reliable front shifting
  • Strong value compared with Dura-Ace
  • Premium appearance and finish
  • Proven Shimano Hollowtech II bottom bracket compatibility
  • Wide crank length options
  • Reliable long-term performance