Product Overview
Precision Ti-6Al-4V titanium crank pre-load cap for Shimano Hollowtech II cranksets. Lightweight, low-profile design with secure bearing pre-load control and premium surface finishes.
The S-PARTS Titanium Crank Pre-load Cap is engineered specifically for Shimano Hollowtech II crank systems, where accurate bearing pre-load is critical to drivetrain smoothness and long-term durability.
Unlike standard plastic caps that can deform or strip over time, this precision-machined titanium cap maintains consistent pre-load tension, even under high vibration and repeated service cycles.
Key Specifications
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Component Type: Crank Arm Pre-load Cap
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Material: Ti-6Al-4V Titanium (ASTM Grade 5)
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Thread Size: M20 × 1.0
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System Compatibility: Shimano Hollowtech II (Road & MTB)
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Cap SN: 29010501, 29010502, 29010503, 29010504, 29010505, 29010506, 29010507, 29010509, 29010510, 29010533, 29010536, 29010537, 29010538, 29010544, 29010547, 29010548, 29010549, 29010550
Direct Fit For:
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Dura-Ace: R9100 / R9200
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Ultegra: R8000 / R8100
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105: R7000 / R7100
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MTB: XTR / XT / SLX (Hollowtech II series)
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Overall Height: 15 mm
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Head Diameter: 25 mm
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Weight: 5.13 g
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Recommended Torque: 3 Nm
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Tool Required: 10 mm hex key
Optional Pinch Bolt Set (Variant Only)
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Quantity: 2 pcs
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Material: Ti-6Al-4V Titanium (ASTM Grade 5)
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Tool Required: T30 Torx
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Weight (Pair): 6 g
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Function: Secures the left crank arm after pre-load adjustment
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Bolt SN: 29020501, 29020502, 29020503, 29020504, 29020505, 29020506, 29020507, 29020509, 29020510
✅ Available Finishes
Gold, Black, Titanium, Blue, Purple, Green, Rainbow, Candy, Indigo, Prism, Splatter Pop, Neon Splatter, Topographic Glacier, GreatWave, Rabbit Camo, Tiger Green-Gold, Jaguar Green-Gold, Snowstorm
Surface finishes are achieved through advanced anodizing or PVD coating, depending on color.
✅ Performance Advantages
Most stock Shimano crank pre-load caps are made from plastic and are prone to rounding or stripping during repeated adjustment.
The S-PARTS Ti-6Al-4V titanium pre-load cap delivers strength comparable to 10.9-grade steel at nearly half the weight, ensuring your bearing pre-load remains stable and precise. This translates to smoother crank rotation, improved bearing longevity, and greater confidence during servicing.
With an average tensile strength exceeding 1050 MPa, Ti-6Al-4V titanium offers an exceptional strength-to-weight ratio that standard materials simply cannot match.
✅ Precision Manufacturing
Each pre-load cap is produced using S-PARTS proprietary hot-forging molds, followed by final machining on military-grade multi-axis CNC equipment. Strict mold life control and micron-level tolerance management ensure smooth thread engagement and consistent fit across all compatible cranksets.
