Shimano Ultegra Road Crankset 172.5mm 53/39T R8000

The Shimano Ultegra Hollow Tech II Crankset (IFCR9100DX39) combines cutting-edge engineering with versatile performance for serious road cyclists seeking efficiency and durability on every ride. Designed to deliver responsive power transfer without compromising on weight savings, this double chainring system features a hollow forged aluminum construction that minimizes rotational mass while maintaining exceptional lateral stiffness—critical for high-cadence sprints or steep technical climbs. With an 11-speed drivetrain setup and 53/39 tooth ratios, it offers precise gear progression whether you’re tackling grueling century rides or accelerating out of tight criterium corners.

Engineered for modern road bike geometries, this crankset ensures optimal chain stability through its asymmetric design and widened gear pitch spacing. The increased clearance between chain and teeth reduces friction and noise during aggressive shifts while enhancing reliability over rough pavement or gravel transitions. Compatible with disc brake road hubs (135/142mm) on frames with over 415mm chainstays, it seamlessly integrates with contemporary endurance and racing machines without requiring additional adapters or modifications.

Key technical specifications include a Shimano Asymmetric BCD of 110mm for balanced chainring alignment and durability under load, paired with a 9/16″ spindle diameter for secure pedal attachment on your favorite clipless pedals. At just 690 grams (without bottom bracket), this mid-range crankset strikes an ideal balance between premium performance and value compared to higher-tier options like Dura-Ace or SRAM Red eTap AXS systems.

Why Choose Ultegra Hollow Tech II?
| Feature | Ultegra HT II | Competitor Models |
|—————————|————————-|—————————-|
| Weight | Lightweight at 690g | Heavier at ~720g |
| Stiffness | Race-proven rigidity | Moderate flex under load |
| Hub Compatibility | Disc-specific (≥415mm CS)| Limited disc support |
| Chainring Durability | Asymmetric BCD design | Traditional BCD alignment |
| Value | Mid-range pricing | Premium pricing tiers |

Ideal for riders prioritizing stiffness-to-weight ratios without breaking the bank, this crankset excels in all-day comfort on endurance tours while providing sharp responsiveness during criterium races or group rides. Its sleek black finish complements any build while resisting corrosion from rain or salted winter roads.