Box One Stem Spacers 1-1/8"

Product Overview

Box One stem spacers are precision-machined aluminum spacers used to adjust headset height and stem positioning on BMX bikes with 1-1/8" steerer tubes. This five-piece kit provides flexible spacing adjustments from 1mm to 10mm in total height, letting you dial in the exact cockpit geometry you need.

Key Features

• 6061-T6 aluminum construction – Extruded and CNC-machined for consistent tolerances and reliability
• Ultra-minimalist design – Reduces unnecessary material while maintaining structural integrity
• Lightweight – Individual spacers weigh 0.02–0.14 oz (0.56–4g) depending on thickness
• Five-piece mixed kit – Includes (2) 1mm, (1) 3mm, (1) 5mm, and (1) 10mm spacers for comprehensive adjustment options
• Stacking compatibility – Spacers can be combined to achieve any height between 1mm and 20mm total

Technical Specifications

• Steerer tube size: 1-1/8" (integrated or threaded)
• Material: 6061-T6 aluminum alloy
• Included spacers: 1mm (x2), 3mm, 5mm, 10mm
• Individual weights: 0.02–0.14 oz per spacer (0.56–4g)
• Quantity: 5 pieces per pack

Compatibility & Ideal Use Cases

These spacers fit 1-1/8" steerer tubes found on most modern BMX headsets. They're essential for fine-tuning stem height during initial bike setup or after replacing forks, bars, or stems. Use them to adjust bar rise for comfort, clearance, or personal preference without replacing your entire stem.