SHIMANO 105 R7100 FRONT CRANKSET 50-34 172.555
The Shimano 105 R7100 crankset is a high-performance 12-speed component that brings professional-grade engineering to a broader range of road cyclists. Balancing weight and efficiency, this crankset provides the rigidity needed for explosive sprints and the reliability required for long-distance endurance riding.
Key Performance Features
Hollowtech II Construction: Utilises a hollow-forged aluminium design to maximise stiffness and power transfer while significantly reducing overall weight.
12-Speed Optimized: Specifically engineered to work with Shimano’s 12-speed road drivetrains, featuring refined tooth profiles for smoother, faster front shifting.
Versatile Gearing Options: Available in popular "mid-compact" (52-36T) and "compact" (50-34T) configurations to suit both flat-out racing and steep alpine climbing.
Enhanced Power Transfer: The four-arm spider design is reinforced in high-stress areas to ensure every watt of energy is converted into forward momentum.
Iconic 105 Aesthetics: Features a sleek, gloss-black finish that mirrors the high-end Dura-Ace and Ultegra series for a premium look on any bike.
Durable Chainring Finish: The anodised aluminium chainrings are designed to resist wear and maintain shifting precision over thousands of kilometres.
Technical Specifications
| Feature | Specification |
| Speed | 12-Speed |
| Crank Arm Material | Hollow Forged Aluminium |
| Chainline | 44.5 mm |
| Q-Factor | 148 mm |
| Bolt Circle Diameter | 110 mm (Asymmetric) |
| Weight | Approx. 754g (50-34T) |
Why This IS For You
✅ Reliable Performance: The perfect balance of price and performance for enthusiasts who want a modern 12-speed setup without the "pro-team" price tag.
✅ Endurance Ready: The 50-34T compact option is the gold standard for riders who tackle steep climbs and want to maintain a comfortable cadence.
✅ Proven Durability: 105 is legendary for its "workhorse" reputation, making this an ideal choice for year-round training and racing.
Why This May NOT Be For You
❌ Weight Conscious Racers: While light, those looking for absolute minimum weight may prefer the carbon-infused spiders of Ultegra or Dura-Ace.
❌ Legacy Drivetrains: This crankset is designed for 12-speed chains; using it with 10 or 11-speed setups may result in less-than-optimal shifting performance.
BFC Pro Tip
When installing the R7100 crankset, always use a high-quality torque wrench for the non-drive side pinch bolts (Shimano recommends 12-14 Nm). These bolts should be tightened incrementally and evenly to prevent the crank arm from working loose. Also, if you’re upgrading from an older 11-speed 105, you can usually keep your existing Hollowtech II bottom bracket, as the spindle diameter remains the standard 24mm!
