Ball Mount Seat Back Anchor for Rivian R1T & R1S - Secure 17mm Clamp

In this review the Ball Mount Seat Back Anchor for Rivian R1T & R1S is evaluated as a simple, purpose-built accessory for Rivian owners who need a reliable mounting point behind the front seats. The main reason to buy is clear: it adds a secure 17mm ball mount without contacting seat coverings or trim, making it ideal for passengers who want to mount phones or tablets for navigation or media. Fit and function are the standout strengths, and the review focuses on build quality, installation, and real-world use.

Key Features

• Custom fit for Rivian: Designed specifically to clamp onto the hook behind the driver or passenger seat of R1T and R1S models, ensuring a secure fit across Gen 1 and Gen 2 vehicles.
• 17mm ball mount: Provides a widely compatible mounting point that works with many phone and tablet clamps sized for 5-11 in devices.
• Made in USA materials: Constructed from high-temperature PolyHex plastic and stainless steel fasteners for heat resistance and long-term durability.
• Non-intrusive clamp: The anchor clamps onto the seat back hook without touching seat covering or interior trim, preserving the cabin finish.
• Reliable mounting: Engineered to hold accessories securely in place during regular driving, useful for rear passengers or cargo-area setups.

Who It's For

The Ball Mount Seat Back Anchor is best for Rivian R1T and R1S owners who want a clean, factory-friendly way to add a 17mm ball mount behind either front seat. It suits parents who mount tablets for rear passengers, drivers who need a secondary device mount, or anyone who prefers a metal-and-plastic anchor made in the USA.

It is less suitable for owners of other vehicle brands or users who need heavy-duty industrial mounts; this product is optimized for consumer devices and in-cabin accessory use rather than very large equipment.

Pros & Cons

Pros

• Custom-designed fit yields reliable, snug attachment to the Rivian seat back hook.
• High-temperature PolyHex plastic and stainless steel fasteners resist heat and provide longevity.
• Standard 17mm ball mount is compatible with a wide range of phone and tablet clamps for 5-11 in devices.
• Clamps without contacting seat covering or trim, protecting the interior finish.

Cons

• Some users report mixed experience with ease of removal, so it may take practice to remove or reinstall quickly.
• Designed only for Rivian R1T and R1S models, so it is not universal for other vehicles.

Specifications

Compatibility	Rivian R1T and R1S, Gen 1 and Gen 2
Mount type	Standard 17mm ball mount with clamp
Device compatibility	Phones and tablets 5-11 in
Materials	High-temperature PolyHex plastic, stainless steel fasteners
Origin	Manufactured in USA
Installation point	Clamps onto hook behind driver or front passenger seat

Our Verdict

The Ball Mount Seat Back Anchor is a practical, well-made accessory for Rivian owners who need a discreet and robust 17mm mounting point behind the front seats. Given the custom fit, durable materials, and compatibility with common phone and tablet clamps, it represents good value for those specific use cases; buyers should be aware removal can be slightly fiddly until familiar with the clamp.

Frequently Asked Questions

Will this fit all Rivian model years?
Yes, it is compatible with Rivian R1T and R1S across Gen 1 and Gen 2 model years.

What devices will mount to the 17mm ball?
The 17mm ball works with phone and tablet clamps designed for 5-11 in devices that accept a 17mm ball mount.

Does it touch the seat covering or trim?
No, the anchor is designed to clamp to the seat back hook without contacting seat covering or plastic or wood trim, preserving the interior finish.