BRCOVAN Aluminium Motorcycle Fork Stem Mount Base — 1" TPU Ball Adapter, Fits 12–25.4mm Forks, Vibration-Resistant

BRCOVAN's aluminum fork stem mount base provides a secure, adjustable 1" TPU ball connection that fits motorcycle fork stem bores from 12mm to 25.4mm.

This compact fork-stem-mounted ball base converts a motorcycle's hollow fork stem into a robust mounting point for 1" ball-arm systems. Machined from aluminum and paired with a B-size 1" TPU ball, the adapter works with RAM-style mounts and compatible BRCOVAN double-socket arms to hold phones, GPS units, tablets, rod holders and other accessories. The kit includes two size spacers so you can match the adapter to a wide range of tube diameters and achieve a solid, vibration-resistant fit when installed to the recommended depth.

How does this mount attach inside my fork stem?

The unit slips into the hollow fork stem and expands or clamps in place using a center bolt tightened with the supplied Allen wrench. Install the spacer that matches your tube diameter, push the assembly into the stem to the minimum depth, then tighten the bolt clockwise to lock it firmly.

• Works in cylindrical or hex bore walls; not for stems with internal lips
• Use small spacer for 12mm–18.5mm tubes, large spacer for 18.5mm–25.4mm
• Requires minimum 38mm tube depth for secure mounting
• Do not combine both spacers simultaneously

Which devices can I mount to the 1" TPU ball?

The included B-size 1" TPU ball accepts any accessory or arm that uses the standard 1" swivel-ball pattern. That makes this base suitable for various phone mounts, GPS holders, tablet cradles, fishing rod holders and camera or action-cam adapters that use 1" ball connectors.

• Compatible with RAM-style B-size 1" ball sockets
• Pairs with BRCOVAN 1" double-socket arms and other brands using the same standard
• TPU ball material reduces slip and vibration transfer compared to hard plastic
• Adapts fork stem into a multi-use mounting hub on motorcycles

Is installation difficult and what tools are needed?

Installation is straightforward and performed with the included Allen wrench. After measuring your tube diameter and fitting the correct spacer, insert the unit into the stem and tighten the bolt; no special tools or drilling are required when the stem bore is suitable.

• Includes Allen wrench for bolt tightening
• Pre-install check: measure tube diameter and verify inner stem has no lip
• Typical install time: under 10 minutes for standard stems
• Requires minimum internal depth of 38mm for proper engagement

Who is this for? Riders and installers who want a clean, low-profile way to add a standard 1" ball mounting point inside the motorcycle's fork stem will appreciate this adapter. It suits motorcyclists who prefer a factory-like look without external clamps, users who already own 1" ball-arm accessories, and anyone needing a stable attachment point for navigation, phone mounting, or accessory expansion. Avoid using the product on stems with internal lips or insufficient depth; otherwise it’s a practical solution to centralize mounts and reduce handlebar clutter.