System Alloy QR Post Clamp 29.8mm ID

Product Overview

The System Alloy QR Post Clamp is a quick-release seat post clamping collar designed for chromoly frames. With a 29.8mm inner diameter, it accommodates standard 27.2mm seat posts on frames with integrated or standard seat post bores. The quick-release mechanism enables tool-free seat post adjustment and removal.

Key Features

• Quick-release mechanism – Tool-free lever allows rapid seat post height adjustment and removal without bolt tools. Ideal for quick setup changes, transportation, and seat post swaps during training or competition.

• Alloy construction – Lightweight aluminum body reduces weight while maintaining adequate clamping strength. Durable alloy resists corrosion and maintains finish.

• 29.8mm inner diameter – Engineered bore precisely fits chromoly and steel frame seat tubes. Tight tolerance ensures adequate clamping force without excessive tightness that could damage frame material.

• 27.2mm seat post compatibility – Accommodates standard oversize BMX and mountain bike seat post diameter. Works with typical contemporary seat post sizes without adapters.

• Chromoly frame specific – Designed for steel and chromoly frame construction, optimizing clamping geometry for these materials without damaging thin-wall tubing.

• Reliable clamping – Quick-release design maintains consistent clamping force across repeated adjustments. Prevents seat post rotation or slippage during riding.

• Simple installation – Straightforward bolt-on assembly requires minimal tools. Easy removal for frame inspection or seat post replacement.

Technical Specifications

• Type: Quick-release seat post clamp
• Material: Alloy (aluminum)
• Inner diameter: 29.8mm (for Cr-Mo frames)
• Seat post compatibility: 27.2mm diameter
• Mechanism: Quick-release lever
• Frame type: Chromoly and steel

Compatibility and Ideal Use Cases

Compatible with:

• Chromoly and steel BMX frames with standard seat post bores
• 27.2mm diameter seat posts
• All BMX frame styles and riding disciplines

Ideal for:

• Quick seat post height adjustment during training or racing
• Rapid seat post removal for transportation or storage
• Chromoly frame builds prioritizing tool-free operation
• Riders seeking quick-release convenience without bolts
• Competitive BMX racing with frequent setup changes