FIT Bike Co. Blunt 24mm 3-Piece Crankset with Bottom Bracket

The FIT Blunt is a 24mm 3-piece crankset built around two specific design priorities — ankle safety and grind durability. Investment cast blunt spindle bosses, flush mount bolts, and heat-treated concave arms address both concerns directly. A complete mid BB kit is included, making this a full drivetrain foundation in a single purchase.

Key Features

• Investment cast blunt spindle bosses — Cast construction produces a rounded, blunt boss profile rather than the sharp edges common on machined bosses, directly reducing ankle strikes during riding and grinds
• Flush mount bolts — Crank arm bolts sit flush with the arm surface rather than protruding, eliminating another common source of ankle cuts; accepts both 6mm and 8mm Allen keys for installation flexibility
• Concave indented and swaged 100% heat-treated CrMo arms — Concave arm profile and swaging increase cross-sectional rigidity without adding material weight; full heat treatment throughout both arms improves dent resistance during grinds and slides where the arm makes direct contact with surfaces
• Hollow 24mm heat-treated CrMo spindle — Hollow construction removes material from the spindle's center where it contributes least to strength, reducing overall weight; heat treatment increases spindle hardness and fatigue resistance under pedaling load
• Complete BB kit included — Full bottom bracket set included with the crankset, eliminating the need to source a separate BB before installation
• RHD and LHD compatible — Configurable for both right-hand and left-hand drive setups
• 15/16" / 24mm center bore sprocket compatibility — Works with all standard 15/16" / 24mm center bore sprockets; sprockets supplied with 19mm or 22mm hat washers are compatible with the hat washer removed
• M10-1.5 x 16mm sprocket mount bolt — Standard thread spec for sprocket mounting

Technical Specifications

• Brand: FIT Bike Co.
• Model: Blunt 3-Piece Crankset
• Spindle diameter: 24mm
• Spindle material: Hollow heat-treated CrMo
• Arm material: 100% heat-treated CrMo
• Arm finish: Concave indented and swaged
• Boss type: Investment cast blunt
• Crank bolt: Flush mount, 6mm and 8mm Allen compatible
• Sprocket mount bolt: M10-1.5 x 16mm
• Sprocket compatibility: 15/16" / 24mm center bore
• Drive compatibility: RHD / LHD
• Weight: 30 oz (160mm, without BB)
• Includes: Complete mid BB kit

Compatibility and Ideal Use Cases

Compatible with mid BB shell frames — BB kit is included and sized for 24mm spindle. Sprocket compatibility covers all standard 15/16" / 24mm center bore sprockets; hat washer removal required for sprockets supplied with 19mm or 22mm hat washers. Best suited to street and park riders who grind regularly and want a crankset that addresses both ankle safety and arm durability at the contact points most exposed during slides and grinds.