RAM Mounts RAM-B-231ZU Handlebar U-Bolt Base with 1″ Ball

The RAM-B-231ZU Handlebar U-Bolt Base features a durable zinc-coated metal U-bolt paired with a 1″ B-size RAM rubber ball, allowing you to attach compatible arms and accessories at right angles to tubular rails. Designed to clamp rails with diameters from 0.5″ to 1.25″, this base is tough and adaptable — ideal for mounting GPS units, phones, cameras and other devices on handlebars, ATV frames, roll bars and tubular structures.

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Handlebar U-Bolt Base for Secure Mounting

The RAM-B-231ZU U-bolt base uses RAM’s modular ball-and-socket system to create secure, adjustable mounting points on round rails. Included black cover caps protect exposed bolt ends, and a composite adapter lets you tighten the fit on narrower rails. Pair this base with RAM double socket arms or device holders (sold separately) to build a customised mounting solution.

Why Choose the RAM-B-231ZU U-Bolt Base?

• Zinc-coated metal U-bolt with integrated 1″ B-size rubber ball for adjustability
• Fits rails from 0.5″ to 1.25″ diameter — perfect for handlebars, tubes and roll bars
• RAM’s ball-and-socket technology for near-infinite positioning
• Includes black caps for exposed U-bolt ends
• Marine-grade aluminium construction for durability
• Backed by RAM Mounts lifetime warranty

Specifications

• Model: RAM-B-231ZU
• Clamp Range: 0.5″ – 1.25″ diameter rails
• Ball Size: B-Size (1″ / 25 mm)
• Material: Zinc-coated metal & marine-grade aluminium components
• Recommended Load: Standard use up to ~2 lb
• Weight: ~0.27 lb (approx.)
• Adaptable Rails: Includes composite adapter for narrower tubes

What’s Included

• 1 × RAM-B-231ZU Handlebar U-Bolt Base with 1″ Ball
• Black cover caps for U-bolt ends

Use Cases

Ideal for mounting:

• Phones & tablets
• GPS units
• Action cameras
• Small displays and accessories
• Tubular handlebars, roll bars and frame rails

Looking to build a complete mounting system with RAM arms and accessories? Explore our RAM Mounts vehicle mounting systems →