BRCOVAN Motorcycle Fork Stem Mount Base — Aluminum Alloy with 1" TPU Ball, Fits 12–25.4mm Stems

BRCOVAN's aluminum alloy fork stem mount base with a 1" TPU ball provides a secure in-stem mounting point for phones, tablets, GPS units and accessories on motorcycles with 12–25.4mm fork stem tubes.

Designed to slip into the hollow of a motorcycle fork stem, this compact mount base converts the tube into a stable, removable ball-and-socket mounting location. Constructed from machined aluminum with an included 1" TPU ball and two spacer sizes, the unit adapts to most standard fork stem diameters and pairs with B-size 1" arms and many RAM-style accessories. The package includes the mount base, two spacers, an Allen wrench and installation hardware; a quick measurement and simple tightening are all that’s required for a finished install.

How do I know this will fit my motorcycle fork stem?

Measure the internal diameter of the fork stem tube where the mount will sit. The base accepts tube diameters from 12mm up to 25.4mm using the included spacers; choose the correct spacer so the mount wedges securely against the bore wall.

• Supported tube diameters: 12mm–25.4mm
• Small spacer fits 12mm–18.5mm tubes
• Large spacer fits 18.5mm–25.4mm tubes
• Minimum tube depth required: 38mm

What accessories are compatible with the 1" TPU ball?

The mount uses a B-size 1" TPU swivel ball that is compatible with BRCOVAN B-size double-socket arms and most RAM-style accessories using the same 1" ball pattern. That makes it suitable for phone holders, tablet mounts, GPS units and other accessory adapters that accept a 1" ball attachment.

• Works with BRCOVAN B-size 1" arms and sockets
• Compatible with many RAM-style 1" ball mounts
• Useful for phone, tablet, navigation, and rod holder attachments
• TPU ball provides a snug friction fit for swivel adjustment

How simple is the installation process?

Installation is a two-step mechanical fit: choose the spacer that matches your tube diameter, insert the base into the stem bore, then tighten the supplied bolt with the included Allen wrench until the base wedges in place. The process is reversible and meant to be completed without specialized tools beyond the provided wrench.

• Step 1: Fit correct spacer into mount base
• Step 2: Insert base into stem tube and tighten bolt clockwise
• Included tools: Allen wrench and mounting bolt
• Do not use two different-size spacers at once; do not install if the stem hole has a lip

What should I check before buying and installing this mount?

Confirm the fork stem internal diameter and depth are within the supported ranges and that the stem bore is smooth and lip-free to allow the mount to seat correctly. The mount requires at least 38mm of tube depth and will not seat properly in stems that have an internal ridge or lip.

• Measure internal tube diameter and depth before purchase
• Ensure at least 38mm of clear bore depth
• Do not install if there is a lip or ridge inside the stem hole
• Choose one spacer size that matches your tube — do not mix spacers

Who this is for: Riders who want a clean, in-stem mounting point for electronics or accessories without permanent drilling or external clamps will appreciate this BRCOVAN solution. It’s aimed at motorcyclists with hollow fork stems in the specified diameter range who need a reversible, low-profile mount that works with standard 1" ball accessories and provides stable attachment for navigation, phone or other devices while riding.