Consider the size of the tires that you mount on this device. I bought 2. I had 4 17" tires and they fit perfectly. Directly underneath I wanted to fit 4 20" tires as I saw a review that said they could easily fit 19" tires but for me I had a tire. Wall and it didn't fit the bracket all the way so I took a piece of 2x4 and screwed it to the wall with 4 screws then I screwed a bracket onto this 2x4 that acted as a spacer to prevent the tires from touching the wall and seat properly in the bracket. I also placed a long tie bolt down the middle so I had at least one link on either side going from the bracket through the 2x4 and to the bolt in my house for added security. Also I have to say these are fairly basic and easy to use medium tube holders that slide in and adjust but they wobble and hang a bit under the weight compared to what was a solid one piece but that's something that you sacrifice for adjustability I doubt the center tubes can snap or bend under the weight of multiple tires.
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