Position One Bottom Bracket Euro Square

Position One Bottom Bracket Euro Square

Overview

The Position One is a sealed cartridge bottom bracket engineered for BMX frames using internal BSA/BSC threading. The euro cartridge design houses sealed bearings that resist dirt and moisture, providing reliable pedaling performance with minimal maintenance. The square JIS axle accommodates compatible square-taper cranksets.

Key Features

• Sealed cartridge bearing design — One-piece sealed unit protects bearings from dirt, water, and contaminants; reduces maintenance and extends bearing life
• Square JIS axle compatibility — Works with square-taper cranksets featuring JIS standard (not compatible with ISIS splines or octalink cranks)
• Two axle length options — Available in 113.5mm or 118mm to accommodate different frame bottom bracket widths and crank spindle positions
• BSA/BSC threading — Standard British bottom bracket thread; fits internally threaded bottom bracket shells
• Sealed bearing performance — Tight, frictionless bearing surfaces enable smooth pedaling efficiency

Technical Specifications

• Type: Euro cartridge
• Housing diameter: 34.5mm
• Axle standard: Square JIS
• Axle length options: 113.5mm or 118mm
• Thread standard: BSA / BSC (British Standard)
• Frame bottom bracket width: 68mm
• Weight: 340g (118mm version with axle screws)
• Included: 2 axle mounting screws
• Bearings: Sealed cartridge

Critical Note — Axle Length Selection

The correct axle length is essential for proper crank position and chainline. Measure the bottom bracket axle you are replacing to determine whether you need 113.5mm or 118mm. Incorrect length selection will result in improper crank alignment and drivetrain performance.

Compatibility & Ideal Use Cases

• Frame compatibility: BMX frames with internally threaded BSA/BSC bottom bracket shells (68mm width)
• Crank compatibility: Square-taper JIS standard cranksets only (not compatible with ISIS splines or octalink)
• Best for: BMX riders with square-taper cranks; riders seeking sealed bearing reliability and low maintenance
• Ideal use: General BMX riding, training, and racing with square-taper cranks
• Not suitable for: ISIS-splined cranks; octalink cranks; externally threaded bottom bracket frames

Width 113 or 118mm ?
Measure the bottom bracket axis you wish to replace.
L = length of the bottom bracket axle.