Surly Handlebar Shim 25.4 to 31.8mm Stem Adapter

Surly Handlebar Clamp Shim

25.4mm to 31.8mm | Stem Adapter | Black

The Surly Handlebar Clamp Shim allows you to safely mount a 25.4mm handlebar into a 31.8mm stem, making it an essential solution for custom builds, retro conversions, and alternative cockpit setups.

Simple solution. Solid fit. Endless compatibility.

Convert Bar to Stem Compatibility

• Adapts 25.4mm handlebars → 31.8mm stems
• Perfect for BMX, cruiser, and alt-bar setups
• Enables use of modern stems with smaller-diameter bars

Secure & Reliable Fit

• Provides proper clamping surface
• Helps prevent slipping or uneven pressure
• Ensures safe handlebar installation

Durable Construction

• Built for long-term use
• Suitable for road, gravel, and MTB applications
• Trusted Surly durability

Clean, Easy Installation

• Simple shim insert design
• Works with most 31.8mm stems
• Minimal added bulk for a clean cockpit

Specifications

• Brand: Surly
• Product: Handlebar Clamp Shim
• Bar Compatibility: 25.4mm
• Stem Compatibility: 31.8mm
• Color: Black
• MPN: 04-002780

Ideal For

✔ Custom and retro builds
✔ BMX or alt-bar conversions
✔ Bikepacking and adventure setups
✔ Mixing modern stems with legacy bars

Why Choose Surly Clamp Shim?

• Expands cockpit compatibility
• Simple, effective solution
• Durable and reliable
• Trusted Surly quality

The Surly 25.4 to 31.8mm Handlebar Shim is the easiest way to bridge component standards and dial in your ideal cockpit setup.