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Question: Can I use an s2 w/Otter defender case with this?Also I'm cycling.What's the best mount for me?  Thanks
Document: I've owned may different RAM mounts and they are alwaysvery well made. This is no different. It fit's my Galaxy 3Swith or without my Otter box Defender case attached.Holds the phone secure with no issues. Great product.
Love it! The rubber grips combined with the rubber case (Otter Box) I have my phone in make for a perfect combination for my '78 GoldWing GL1000. I never have to worry about my phone falling out while cruising down the road.I also bought one for my '00 Nissan Frontier. Works great in there as well.Well worth the $$.
this thing is friggin awesome! i'm using it to hold an iphone 5 with an otterbox defender series case. holds it perfectly.
I like this for my car because it allows me to properly secure my phone while I'm driving. As I do a little telecommuting, I don't need this to text while driving but definitely have it held in a position that allows me to see the screen if I get an incoming message or call as well as having the phone stable enough to swipe to pick up or deny a call. And this holds my Samsung Galaxy SIII, in an Otterbox Defender case mind you, easily.
I bought this to primarily use for my Moto X phone. I have used it with a Droid 3, FRS radio, Garmin GPS too. It works excellent. I use it in my truck with a RAM suction mount on my windshield. I like that it is easy to load/remove my devices & holds them even if they have a case. I have an Otterbox defender & a simple TPU case for my Moto X & it works perfect with both.
got this along with a CASEFORMERS Duo Armor BLACK for LG G2 Combo Case with Stand and Holster to mount my phone on my bike to control a GoPro.which is also mounted on the bike ... I'm good with it.
I use this with my Samsung Galaxy Tab 2 7&#34; tablet. Perfect fit.awesome mount and worth the extra money. I've tried sveral cheap versions you can but at say Walmart, this is contructed and engineered much better than what you will find at a Pep Boys let's say.. Yep bought ones there too.I also purchased th RAM mount for my Samsung Galaxy SIII cell phone. Again just awesome! The twist lock suction mount is the best and most reliable I have seen or used.
Works with iPhone4 in an Otterbox defender case. I Purchased it  for use on my motorcycle and could not be happier.
I wasn't real sure this would hold but it does. I have a Mophie case on my iPhone that is also a battery. No other holder would fit so I tried this. I'm very pleased. You need to be careful one of the arms doesn't hit the volume buttons but other than that it works perfectly.
I use this in my boat and was having trouble finding a holder that fit the phone with the otter box case on it. This was the perfect solution.
Answer: I have an s4 and it has a width of 2.76 inches the s2 has a width of 2.60 inches, i can tell you that the s4 fits in it with a case with room to spare, so the s2 with otter box should be fine. It's a terrific mount, i use it on my boat, kayak and bike.