Shimano 105 FC-R7100 12-Speed Road Bike Crankset

£118.00 GBP

Taxes included. Shipping calculated at checkout.

105 FC-R7100 Crankset combines stiff Hollowtech II construction, efficient power transfer and dependable 12-speed shifting at an excellent price, making it a smart road bike upgrade for Australian climbing, racing, bunch rides and long-distance cycling.

Shimano 105 FC-R7100 Crankset Features

Hollowtech II construction balances stiffness, durability, low weight and efficient power transfer.
Available with versatile 50-34T compact or faster 52-36T semi-compact gearing.
Five crank lengths from 160mm to 175mm support more precise bike fitting.
Optimised 12-speed chainrings deliver fast and controlled front shifts with mechanical or Di2 Shimano road drivetrains.
Gloss-black anodised finish provides durable protection and a premium appearance.

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Crank Arm Length (mm)

Tooth Count/Gear Ratio

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General specifications

Product type: Double road bike crankset
Shimano series: 105 R7100
Model: FC-R7100
Drivetrain configuration: 2x12-speed
Compatible chain: Shimano HG 12-speed
Chainring combinations: 50-34T or 52-36T
Crank lengths: 160mm, 165mm, 170mm, 172.5mm and 175mm
Chainline: 44.5mm
Q-factor: 148mm
Pitch circle diameter: 110mm
Chainring mounting pattern: Asymmetric four-arm
Axle system: Shimano Hollowtech II
Axle diameter: 24mm
Bottom bracket type: Outboard bearing
Recommended threaded bottom bracket: Shimano SM-BBR60
Recommended press-fit bottom bracket: Shimano SM-BB72-41B
Compatible threaded shell widths: 68mm BSA and 70mm Italian
Pedal thread: Standard 9/16 inch
Colour: Gloss black
Bottom bracket included: No
Power meter included: No
Manufacturer weight: Approximately 754g for the 170mm 50-34T version without bottom bracket

50-34T compact gearing

The 50-34T version is the most versatile option for recreational road cyclists, climbers and endurance riders. Its 34T inner chainring makes it easier to maintain a comfortable cadence on steep roads, particularly when matched with Shimano’s 11-34T or 11-36T 12-speed cassette.

This combination is especially attractive for riders tackling rolling hinterland roads, long alpine climbs, gran fondos or routes where fatigue can make lower gearing valuable late in the ride. It still retains a 50T outer chainring for fast bunch rides, commuting and general road cycling.

52-36T semi-compact gearing

The 52-36T option provides a higher top gear and may better suit strong riders, racers and cyclists who regularly ride in fast groups. The 36T inner chainring remains manageable on moderate climbs, particularly when paired with a wide-range 11-34T or 11-36T cassette.

The 52-36T combination is generally preferred when maintaining speed on flat roads, rolling race courses and fast descents is more important than obtaining the lowest possible climbing gear.

Compatibility notes

Compatible with Shimano 105 R7100 mechanical 12-speed drivetrains.
Compatible with Shimano 105 R7150 Di2 12-speed drivetrains.
Compatible with the Shimano 105 Di2 front derailleur when installed and adjusted correctly.
Requires a Shimano-compatible 24mm Hollowtech II bottom bracket.
Designed around a 44.5mm road chainline.
Requires a Shimano-compatible 12-speed HG chain for best shifting performance.
Bottom bracket, pedals and installation tools are normally sold separately.
Not intended for Shimano GRX Wide chainlines or mountain bike drivetrains.
Earlier Shimano 11-speed chainrings should not be treated as direct 12-speed replacements.

Hollowtech II

Shimano Hollowtech II places the crank axle on the drive-side crank arm and positions the bottom bracket bearings outside the frame shell. This arrangement creates a broad bearing stance that supports efficient power transfer while allowing Shimano to use a lightweight 24mm hollow steel axle.

The design separates the left crank arm from the axle, allowing bearing preload to be adjusted before the crank-arm pinch bolts are tightened. When installed correctly, it provides smooth rotation, good lateral stiffness and straightforward workshop servicing.

Hollow forged aluminium crank arms

The Shimano 105 FC-R7100 Crankset uses hollow aluminium crank arms to remove material from areas where it is not structurally necessary. This reduces weight without giving up the stiffness required during hard accelerations, seated climbing and high-torque efforts.

The result is a crankset that feels responsive under power without moving into the significantly higher price range associated with Ultegra, Dura-Ace or aftermarket carbon cranksets.

Hollowglide chainring construction

The large chainring uses Shimano’s Hollowglide design principles to balance low weight, stiffness and controlled front shifting. Reinforcing ribs on the rear of the chainring help maintain rigidity as the chain moves between rings.

A stiff outer chainring is important because excessive flex can slow the shift or allow the chain to rub under heavy pedalling. The Shimano design helps the chain climb quickly and predictably onto the outer ring when paired with a correctly installed front derailleur.

Optimised 12-speed tooth profiles

The chainring teeth, shift ramps and pickup features are designed around Shimano’s 12-speed road chain. Their positioning helps guide the chain during front shifts, including shifts performed while climbing or accelerating.

For the best result, riders should use a genuine compatible Shimano chain, the correct front derailleur and a properly aligned derailleur mounting tab. Even a high-quality crankset can shift poorly if the derailleur height, cage angle or support bolt is incorrectly adjusted.

Crank-arm lengths

The Shimano 105 FC-R7100 Crankset is typically available in five lengths (however please confirm ETA and availability ith Pedal Passion)

160mm
165mm
170mm
172.5mm
175mm

Shorter cranks can improve pedal clearance and reduce hip and knee flexion at the top of the pedal stroke. They are increasingly popular with smaller riders, cyclists using aggressive aerodynamic positions and riders whose bike fit benefits from a more open hip angle.

A move to a shorter crank may require the saddle to be raised by approximately the same amount as the reduction in crank length. Saddle fore-aft position, handlebar height and overall fit should also be reviewed rather than changing crank length in isolation.

Longer crank arms can provide additional leverage, but they also increase pedal travel and joint flexion. Rider height alone should not determine crank length. Leg proportions, flexibility, cadence, riding position and previous injury history should also be considered.

Chainring selection

50-34T compact:

Best for climbing and endurance riding
Suitable for recreational cyclists and gran fondo riders
Provides lower gearing for steep Australian roads
Works well with 11-34T and 11-36T cassettes
Offers sufficient top-end gearing for most non-professional riders

52-36T semi-compact:

Best for racing and fast bunch riding
Provides a higher maximum gear
Suits powerful riders and flatter routes
Retains a useful 16-tooth difference between chainrings
Requires greater climbing strength than the compact option

Principal measurements

Chainline: 44.5mm
Q-factor: 148mm
Axle diameter: 24mm
Pitch circle diameter: 110mm
Chainring arms: Four
Pedal thread diameter: Standard 9/16 inch
Threaded frame shell compatibility: 68mm BSA or 70mm Italian with the correct bottom bracket
Press-fit compatibility: Determined by the frame and the appropriate Shimano-compatible 24mm bottom bracket

The Shimano 105 FC-R7100 Crankset is ideal for road cyclists who want reliable power transfer, smooth front shifting and premium-level functionality without paying for a top-tier racing crankset. The 50-34T option is particularly well suited to hilly suburban routes.

Product care

Clean the crank arms and chainrings regularly with a soft brush and bicycle-safe cleaner.
Remove abrasive road grit from the chainring teeth and rear reinforcing structure.
Keep the chain clean and lubricated with a product appropriate for local dry, dusty or wet conditions.
Check chain wear regularly to prevent accelerated wear to both chainrings.
Inspect chainring teeth for hooking, damage or uneven wear.
Check crank-arm pinch-bolt torque according to Shimano’s installation procedure.
Confirm that the left crank-arm safety plate is correctly engaged.
Check bottom-bracket preload if lateral movement or bearing play develops.
Inspect the crank after a crash, pedal strike or significant impact.
Avoid directing high-pressure water at the bottom-bracket bearings.
Use Shimano-approved tools when removing or installing the crankset.
Replace chainrings with compatible Shimano 12-speed components for the most reliable front shifting.
Have creaking, movement or inconsistent front shifts inspected by a qualified bicycle mechanic.

Correct installation is important. The left crank-arm pinch bolts should be tightened alternately and progressively to the specified torque rather than tightening one bolt fully before the other. Excessive bearing preload can cause drag and premature wear, while insufficient preload can permit movement.

Warranty

Shimano Australia provides a two-year limited warranty for eligible Shimano bicycle components purchased new in Australia by the original retail purchaser.

Road.cc reviewed the Shimano 105 R7100 Di2 groupset on 16 August 2022 and rated its real-world performance highly. Reviewer Stu Kerton described the complete groupset as one of Shimano’s most cost-effective high-performance road options, praising the way technology and shifting quality from Dura-Ace and Ultegra had moved into the 105 range. The crankset supported the groupset’s clean and controlled front shifting while keeping the complete system considerably more affordable than Shimano’s premium alternatives.

Shimano Ultegra FC-R8100 Crankset

The Ultegra FC-R8100 is lighter and uses more advanced hollow construction in areas where the 105 crankset uses reinforced material. It is an attractive option for riders building a premium road bike or reducing weight without moving all the way to Dura-Ace.

The Shimano 105 FC-R7100 Crankset offers similar gearing, chainline and core drivetrain compatibility at a lower price. Most recreational cyclists will experience only a small practical difference in stiffness or shifting performance. Ultegra is better for weight-conscious builds, while 105 offers stronger overall value.

Shimano Dura-Ace FC-R9200 Crankset

The Dura-Ace crankset is Shimano’s flagship racing option. It is lighter, uses premium materials and is designed for riders prioritising competition-level weight and finishing.

The Shimano 105 FC-R7100 Crankset is approximately 70g heavier in comparable configurations, but it can cost substantially less. Dura-Ace is the better choice for an uncompromising race bike, while 105 makes more sense for training, endurance events, club racing and everyday road cycling.

Shimano GRX 2x Crankset

Shimano GRX is the more appropriate choice for dedicated gravel bikes. GRX cranksets use gravel-focused gearing and a wider chainline that supports increased tyre and frame clearance.

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