Box Five Square Taper Crank Arms

Box Five Square Taper Crank Arms

Product Overview

The Box Five are square taper crank arms built from 6061-T6 aluminum with a 5-bolt 110 BCD spider. Available in 135mm to 170mm lengths (in 5mm increments), they're designed for compatibility with square taper bottom brackets and standard BMX chainrings.

Key Features

• Square Taper Design – Compatible with square taper bottom brackets; standard BMX connection widely available and proven durable
• 5-Bolt 110 BCD Spider – Larger bolt circle diameter allows for bigger chainring options and optimized spoke geometry
• 6061-T6 Aluminum – Lightweight yet rigid aluminum maintains strength for racing and freestyle applications
• Multiple Crank Lengths – Available in 135mm, 140mm, 145mm, 150mm, 155mm, 160mm, 165mm, and 170mm to accommodate different rider heights and preferences
• Matte Black Finish – Clean aesthetic that matches most BMX builds
• Lightweight Construction – Aluminum arms reduce rotational weight without sacrificing durability

Technical Specifications

• Material: 6061-T6 aluminum
• Bottom bracket type: Square taper
• Chainring pattern: 5-bolt, 110 BCD
• Crank length options: 135mm–170mm (in 5mm increments)
• Finish: Matte black
• Spider design: 5-bolt configuration

Compatibility & Ideal Use Cases

• Square taper bottom brackets – Works with standard square taper BBs (sold separately); verify your frame's BB shell size
• 5-bolt 110 BCD chainrings – Compatible with Box and other brands offering 5-bolt 110 BCD chainrings (chainring sold separately)
• BMX racing and freestyle – Suitable for all riding disciplines
• Crank length selection – Choose based on rider height and personal preference; longer cranks provide more leverage, shorter cranks improve maneuverability
• Beginner to advanced riders – Versatile option for builds at any skill level

Important Notes

• • Bottom bracket and chainring sold separately; purchase based on your frame's BB shell size and desired gearing
  • Ships direct from manufacturer in USA; may ship separately from other orders
  • Square taper connection provides proven durability and wide component compatibility
  • Select crank length carefully; standard sizing ranges 150–165mm for adult riders