They come in a nice storage bag and are easy to use. I had to wrap my hand around the back of the tire to grab the strap. To release it you can just pull a spring tab and fully open the ratchet and it will release (see video). Only the nylon strap touches the metal part of the wheel so it doesn't scratch the wheel and there don't seem to be any clearance issues. The plastic parts also protect the tire. Remember not to place it right next to the valve stem.
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