Well, I have a Samsung Galaxy S8+, it’s 6 3/8 in. x 3 in.
And it fits perfectly and securely in my “RAM Tough-Claw Mount with Universal X-Grip Large Phone Cradle for Plus Sized Phones.” Ram Mounts says it holds devices 1.75” to 4.5” wide and fits rails 0.625” – 1.5”.
It holds my phone securely. And it clamps to my handlebar very securely with a big finger turn screw and goes on and comes off easily—no tools or bolts, etc. I can’t imagine the clamp coming loose even in the roughest riding—you can really torque it down very tight. And the underside has rubber pads so it doesn’t mark up the handlebar in any way.
I only use the additional rubber harness when off-road, but probably don’t really even need it there. The spring-loaded “X-grip” is pretty tight all by itself and I've had no problems with my phone moving around while riding. And I never go anywhere without my phone in its cradle—I use it to open and close the garage door, text while riding, etc. 😊
I've seen complaints of the grip messing with your volume control, but I find it easy to position my phone so that doesn’t happen with the phone still being well centered and secure.
I've had mine almost from the beginning and have had zero problems. I like that I can move the position of the mount if I want or need to—quickly and easily. But I pretty much leave it just to the left of my handlebar mounts.
2018 Honda Africa Twin Adventure Sports - Manual.
Setup: Givi Tall Sport Touring Windscreen; Hepco & Becker Lower Engine Guards; Hepco & Becker Handle Bar/ Hand Guard Protectors; Hepco & Becker Tank Guard Soft Bags for OEM Uppers; HTTMT Kickstand Pad Extender (Red);
RAM Mounts X-Grip; Swegotech Forkshield; Touratech Zega Mundo Panniers and 2018 Rack (31/38L); Touratech 20mm Bridged Handlebar Riser; OEM center stand; OEM skid-plate, uppers and tires.