BOX ONE QR SEAT CLAMP 31.8MM

Product Overview

The Box One Quick Release Seat Clamp is a cold-forged aluminum quick-release seat clamp designed for BMX frames with 31.8mm seat tube diameter. CNC-machined from 6061-T6 aluminum with a cam-action quick-release lever, this clamp allows tool-free seat height adjustment while maintaining secure seatpost retention at minimal weight.

Key Features

• Quick-release lever – Cam-action lever allows tool-free seat height adjustment without needing a hex wrench or socket
• Cold-forged construction – Cold-forging process increases material density and strength compared to standard machining or casting
• 6061-T6 aluminum – Heat-treated aluminum alloy provides strength while keeping weight low
• Zero-friction surface treatment – Proprietary coating on lever head and clamp face ensures smooth lever action without bushings and prevents binding over time
• Titanium hardware – Lightweight titanium components reduce overall clamp weight while resisting corrosion
• Laser-etched graphics – Permanent laser-etched branding won't fade or peel over time

Technical Specifications

• Material: 6061-T6 aluminum, cold-forged and CNC-machined
• Hardware: Titanium
• Clamp size: 31.8mm (seat tube outer diameter)
• Clamp type: Standard round with quick-release lever
• Weight: 27g
• Finish: Anodized with laser-etched graphics

Compatibility and Ideal Use Cases

This seat clamp fits BMX frames with 31.8mm seat tube outer diameter. Measure your frame's seat tube diameter before ordering—seat clamp size must match the frame's seat tube, not the seatpost diameter. The standard round clamp design works with traditional round seat tubes, not integrated or hidden seat clamp systems.

Best suited for riders who frequently adjust seat height between riding styles or who share bikes between riders of different heights. The quick-release lever eliminates the need for tools to change seat position, making on-the-fly adjustments convenient at the park or track. Ideal for riders who alternate between seated pedaling (racing, trails) and low seat positions (park, street tricks). The zero-friction treatment ensures the lever remains smooth and functional without loosening over time. Important: Quick-release clamps require proper lever tension adjustment—the lever should close with firm resistance to prevent accidental opening during riding. Check clamp tightness before each ride to ensure the seatpost remains secure. Not recommended for riders who never adjust seat height or prefer the security of a bolt-style clamp—a fixed clamp offers no moving parts that could potentially loosen.