EVO Phone Mount V4.5

EVO Phone Mount V4.5 for Rivian R1S & R1T

The OpenSourceEV Parts EVO Phone Mount V4.5 is the fourth generation of the most popular inboard phone mount for the Rivian R1S and R1T. It tucks between the gauge cluster and infotainment screen, installs in seconds without tools, and holds securely via friction. Manufactured and supported by OpenSourceEV, tested in Rivian vehicles, and built for daily use and road trips alike.

Choose the mount only and pair it with a ball-compatible holder you already own, or add one of five name-brand MagSafe phone holders at checkout. If you want maximum flexibility, the All + Upgrade Kit option includes every ball size and the parts needed to convert this mount into a NextGen Phone Mount V2.5 -- and vice versa.

What Makes This Different

• Proven Design, Continuously Refined: Four generations of community feedback and real-world Rivian use. The contact area with the infotainment screen was increased 35% in V4 for a tighter, more secure fit.
• Dual Function: An integrated loop on the mount doubles as a sunglasses holder even if your phone is on the mount.
• Modular Ball Mount: The ball is a separate, swappable component. Change holders or replace a broken ball without replacing the entire mount. Available in 17mm, 20mm, and 1-inch sizes, or purchase all sizes in one kit.
• Secured by Steel: An M5 x 35mm stainless steel bolt and nut holds everything in place. Competing mounts rely on clips, which are significantly more prone to failure.
• Textured Ball: The mounting ball has a textured surface that allows phone holders to grip significantly better with less clamping pressure. Other mounts slip.
• Extended Range of Motion: New in V4.5, a slimmer ball base allows nearly 20 degrees of additional adjustment for better phone positioning and ergonomics.
• ASA Construction: Printed from ASA for superior UV resistance and temperature resilience up to 300 degrees F. Competing mounts use PETG, which can deform in heat, or ABS, which fades with UV exposure.
• Open Source Design: Design files are publicly available under Creative Commons NC-SA 4.0 for personal use and remix.

Ball Size Guide

The EVO Phone Mount is available in three ball sizes. The 17mm size works with the vast majority of phone holders on the market, including all five holders we sell. The 20mm size is compatible with Offroam x Peak Design co-branded products. The 1-inch size is designed for RAM-branded accessories only. If you're unsure, choose 17mm.

Available Phone Holders

This mount requires a separate ball-compatible phone holder. The holder snaps onto the ball and locks via a screw on the back. Five name-brand holders are available to add at checkout:

• OSEV Offset Charging MagSafe: OpenSourceEV's own MagSafe holder. Offset to keep your phone clear of the vent airflow. Open center design. Dim blue LED ring for targeting at night. Uses less than 1mw when not charging -- no impact on the 12V battery. Available in 17mm only.
• ATB 720 Degree MagSafe: MagSafe holder with a secondary adjustment screw midway along the arm for the most positioning flexibility of any holder we carry.
• Lisen Offset MagSafe: MagSafe holder offset to keep your phone clear of the vent airflow. Open center design.
• Lisen Charging MagSafe: Charging MagSafe holder. Charges fast with minimal heat. Near-invisible blue LED ring for targeting at night. Uses less than 1mw when not charging.
• Lisen Charging and Cooling MagSafe: Charging MagSafe holder with a built-in cooling fan. Nearly inaudible when running. Small yellow LED indicator. Uses less than 1mw when not charging.

All magnetic holders include a metal ring for phones or cases without built-in MagSafe. Charging holders include a USB-A to USB-C cable.

Key Features

• Installs between the gauge cluster and infotainment screen. No tools, no bolts, no adhesives.
• Secured by an M5 x 35mm stainless steel bolt and nut.
• Integrated sunglasses loop that is usable regardless of the phone being installed.
• Printed from ASA for superior UV resistance and temperature resilience up to 300 degrees F.
• Manufactured, sold, and warranty-supported by OpenSourceEV Parts. Made in the USA.
• Fits Rivian R1S and R1T.

Using a Charging Holder

Charging holders require a USB-A power source. The Scosche OBD-II to USB-A Quick Charge Connector is available as a bundle and is the recommended solution. It plugs into the OBD-II port in the driver footwell, includes an OBD-II passthrough so the port stays accessible, is fused inline, and has a cable long enough to route cleanly under the steering column without running behind trim or weather stripping.

Installation

1. Insert the included nut into mount and thread the stainless steel bolt through the ball and mount body.
2. Tighten the bolt until snug -- it just needs to not rotate.
3. Slide the mount into the gap between the gauge cluster and infotainment screen until it seats firmly.
4. Remove the locking screw from your selected phone holder and slip it over the ball.
5. Snap your phone holder onto the ball mount and lock it down via the holder's locking screw. Again, don't over-tighten as the textured surface should bite well.