RAM X-Grip Large Phone Mount with ATV/UTV Rail Base
Everything you need in one box — base, arm and a spring-loaded cradle for large phones, ready to bolt onto a roll bar or handlebar.
Unlike the two bases above, this is a complete kit: a strap-and-U-bolt rail base, a B-size medium double socket arm, and RAM's spring-loaded X-Grip Large cradle for phones and phablets — all in one box, ready to mount without sourcing anything else.
What's in the kit
In the box: steel strap clamp adapter, stainless-steel U-bolt (0.5"–1" rails), a B-size medium double socket arm (3" socket-to-socket), and the X-Grip Large cradle with its four spring-loaded arms — a clean design that grips the phone directly instead of hiding it behind foam padding. The X-Grip also includes an optional safety tether, which RAM recommends for outdoor use where extra vibration could work the phone loose over time. The cradle fits devices (with most cases) from 1.75"–4.5" (44–114 mm) wide and up to 0.875" (22 mm) deep — check your device's dimensions with its case before ordering.
The kit combines powder-coated marine-grade aluminum, high-strength composite, and stainless steel hardware.
How RAM's modular system works
Every RAM product on this page is part of the same modular system used across RAM's entire catalog. Once you understand how it fits together, every other RAM accessory we sell will make sense too.
- A base — clamps, bolts, or straps onto the vehicle (a rail, a roll bar, a dash, a windshield, or a device's own housing).
- An arm — connects two RAM balls together. It can be locked at any angle, so once mounted you can tilt, rotate, and reposition the device freely, then lock it firmly in place by hand.
- A cradle or holder — grips the specific device (tablet, phone, GPS unit, camera).
The ball size determines what it can carry. RAM uses five ball sizes, each rated for a different weight/duty class:
| Ball size | What it's for |
| A Size | Rarely used; costs more to make than B Size but carries less. Reserved for small, low-profile items like security cameras. |
| B Size — used on this product | RAM's most common size, standard duty. Recommended for phones, GPS units, and light tablets in normal use. |
| C Size | Heavy duty. Used for larger tablets, handheld computers/scanners, CB radios, and anything mounted somewhere with a lot of vibration or shock — exactly the case in a tractor, ATV or UTV cab. |
| D / E Size | Reserved for large monitors and specialist/military equipment; rarely needed outside those cases. |
Rule of thumb: if the mount will live somewhere that's frequently jostled, vibrated, or under constant load — an off-road vehicle like a tractor, ATV or UTV — RAM recommends stepping up to the larger ball size (C rather than B) for extra stability, even if a lighter mount would technically hold the device's weight.
No tools required, on purpose. RAM arms are designed to be tightened by hand only — there's no official torque spec, because the ball-and-socket joint is meant to be adjustable in the field without a wrench. If hand-tightening doesn't hold your device firmly, that's usually a sign the ball size is undersized for the device — sizing up solves it, rather than over-tightening.
Aluminum or composite — both are built for the outdoors. RAM mounts are made from marine-grade aluminum or high-strength composite, interchangeably depending on the product; both carry a lifetime warranty and similar weight ratings. Aluminum's powder-coat finish handles rough vibration and shock slightly better; composite skips the paint entirely, so it has nothing to chip and is often preferred in high-corrosion or salt-air environments. Neither choice is worse — it's a trade-off between finish and environment.
Specifications
| Ball size | B Size (1" / 25 mm) |
| Arm length | Medium, 3" socket-to-socket (76 mm) |
| Holder width range | 1.75"–4.5" (44–114 mm) |
| Holder max depth | 0.875" (22 mm) |
| U-bolt clamp range | 0.5"–1" (12.7–25.4 mm) |
| Strap clamp range | 1.57"–3.15" (40–80 mm) |
| Weight capacity, standard use | 2 lbs (0.9 kg) |
| Weight capacity, heavy-duty use | 1 lb (0.45 kg) |
| Materials | Marine-grade aluminum, high-strength composite, stainless steel |
| Included | Complete kit: base + arm + X-Grip Large cradle + safety tether |
| Warranty | Lifetime warranty |
Frequently asked questions
Is this a complete mount, or do I need to buy anything else?
It's complete out of the box — base, arm and phone cradle are all included. Just clamp it to a roll bar, rail or handlebar and set your phone in the X-Grip.
What size phones fit the X-Grip Large?
Devices from 1.75"–4.5" (44–114 mm) wide and up to 0.875" (22 mm) deep, including most phone cases. Measure your phone WITH its case, since the case is what actually sits in the cradle.
What ball size does it use, and why does that matter here?
B Size (1") — RAM's standard recommendation for phones and phablets. Since a phone is a light, compact device, B size gives plenty of holding strength without the extra bulk of a C-size arm.
Does it come with a tether, and do I need to use it?
Yes, an optional safety tether is included. RAM recommends using it for outdoor/off-road applications — the small amount of rotational movement that's normal in the X-Grip can otherwise become an issue at higher speeds or on bumpy terrain.
Do I need tools to mount or adjust it?
No. The U-bolt/strap base is tightened with a screwdriver or small wrench during initial installation, but the double socket arm itself — which controls the phone's angle — tightens and locks by hand, no tools needed for day-to-day repositioning.
Not sure which RAM combination fits your tablet, phone or GPS unit? Contact us and we'll help you put together the right base, arm and cradle.