I have 29" tires and a 21" frame to help give a reference for how big my bike is and how well this holds onto it. I also wanted to have this unit plugged into to three different locations, but only one of the charger points works and ALL THREE units have the same issue. For now I am going to reserve judgement and see how the holder performs, but Im probably going to use a different holder when I head outdoors, given the value of my phone. I did a chat with Merrell to see what the life of the shoe was (I wore them A LOT! My feet have not felt this good in a long time. Ive been through lots of styles & these are my favorite! The racks are flat which makes it easy to store the shoes without them slipping off. I have about six or seven pairs of Birkenstock sandals, but these are now my favourites. Unlike some other headphone models, the buds still fit in the case with the larger tips. see image.