It is not adjustable and only fits one bike that is not very wide on the back wheel. Very impressive unit. Not sure how else they would design it though. The goodies coming with it are of top quality like the hardcase, external audio cable, usb charging cable. So, this is probably a little unconventional, but I actually bought this mail shelf because I have been wanting a shelf over the side of my bed for a long time. I really wanted them to work for me as they are still in good shape after a month or so of wear, I just wish I could say that for my feet. 5kg road bike and now rarely used 16. The cheap plastic casing exploded and fell apart leaving just the motherboard (which is WAY smaller than the case itself), I thought the first one was my fault so bought another, the same thing happened within days of buying the second one, with an even softer bump. Further, there is a lip around the tiers which also helps keep the spices secure. The phone is ok but customer service and product support are absolutely horrendous.