INSIGHT ISIS AXLE CRANK ARMS

Product Overview

The Insight ISIS Axle Crank Arms are forged aluminum crank arms designed for ISIS bottom bracket spindles. Featuring a 4-bolt 104mm BCD chainring mount, they provide a durable, lightweight drivetrain option for BMX racing. Sold as crank arms only without bottom bracket.

Key Features

• Forged aluminum construction – Forging process increases material density and strength compared to cast cranks, improving durability under high torque loads while keeping weight low
• ISIS bottom bracket interface – Uses the ISIS Drive splined interface with 10 splines for secure attachment to ISIS bottom brackets
• 4-bolt 104mm BCD chainring mount – Accepts chainrings with 4-bolt 104mm bolt circle diameter pattern; provides secure chainring attachment

Technical Specifications

• Material: Forged aluminum alloy
• Bottom Bracket Type: ISIS Drive (10-spline)
• Crank Type: Crank arms only
• BCD (Bolt Circle Diameter): 104mm
• Chainring Mount: 4-bolt

Not Included:

• Bottom bracket (sold separately)
• Chainring
• Chainring bolts

Compatibility and Ideal Use Cases

These crank arms are compatible only with ISIS bottom brackets and are not compatible with square taper, splined (48-spline), Hollowtech II, or other bottom bracket standards. Requires a separate ISIS bottom bracket and 4-bolt 104mm BCD chainring. Verify bottom bracket shell width and threading (typically Euro or English standard) before purchasing a bottom bracket. Ideal for riders building or upgrading a drivetrain who want forged aluminum cranks with the ISIS interface. The 4-bolt 104mm BCD chainring mount is a common standard with good chainring availability. ISIS cranks provide a stronger interface than square taper but are heavier than modern splined or integrated spindle systems.