Cult Crew Cranks – 18"

Product Overview

The Cult Crew 18" cranks are a 140mm aftermarket crankset scaled for younger riders. Built on a 3-piece design with heat-treated swaged chromoly arms, they feature a wraparound gusset, 19mm hollow spindle with 48 splines, and full RHD/LHD compatibility.

Key Features

• 140mm crank length – Scaled for younger riders or riders with smaller frames; shorter arm length provides quicker pedal response and easier manual control
• 3-piece construction – Arms and spindle separate for easier installation, removal, and replacement of individual components
• Wrap-around gusset design – Reinforces the crank arm–to–spindle junction; increases rigidity and distributes stress more effectively during hard tricks and landings
• Heat-treated swaged chromoly arms – Tubing is tapered at stress points to reduce weight without sacrificing strength; heat treatment increases hardness and durability
• 19mm hollow chromoly spindle – Lightweight yet stiff; hollow core reduces rotational mass for responsive pedal feel
• 48-spline interface – Industry-standard spline count for compatibility with most BMX sprockets and hubs; allows easy swaps without tools
• Single flush-mount hollow spindle bolt – Minimalist design reduces frame contact and snagging; hollow design keeps weight low
• 1-piece spindle/sprocket boss – Integrated design eliminates separate fasteners; sprocket mounts directly to spindle for direct power transfer
• RHD/LHD compatible – Works with right-hand or left-hand drive setups; spindle accepts either configuration without modification
• Lifetime warranty – Manufacturer backs product against defects in materials and workmanship

Technical Specifications

• Crank Length: 140mm
• Spindle: 19mm hollow chromoly, 48 splines
• Crankset Style: 3-piece
• Crank Arm Material: Steel (heat-treated swaged chromoly)
• Spindle Material: Steel
• Bore Diameter: 19mm
• Drive Compatibility: RHD/LHD (right and left hand drive)
• Chainrings Included: No
• Bottom Bracket Included: No
• Warranty: Lifetime

Compatibility and Ideal Use Cases

• Spindle compatibility – Requires a 19mm bottom bracket shell; fits standard 19mm BB cups
• Sprocket compatibility – Accepts any 48-spline BMX sprocket; no chainring compatibility (single-speed only)
• Rider size – 140mm length ideal for ages 6–10 or riders with shorter inseams; allows growth room while maintaining responsive crank feel
• Best for – Young riders progressing on complete bikes; kids' BMX bikes requiring scaled crank components
• Frame compatibility – Works with any BMX frame designed for 19mm bottom bracket shells
• Drivetrain – Single-speed only; not compatible with multi-speed chains or derailleur systems
• Component upgrades – Individual arms or spindle can be replaced without replacing entire crankset

Shipping is often faster, but some items like this one can take 1–3 weeks to ship.