Its got this high pitched whir that I can hear over the the TV and everything else in the room. I have had a problem with both pair with the stones coming loose on the strap. My favorite shoe! But they are really expensive, when I saw some for less £100 but refurbed, I gambled. There are no cons to the bike excellent bike for the money couldn?t be happier with the purchaseMy only problem was this my wife is short she can reach the pedals but her and I both have a bad back and we couldNot lay down on the handlebars and pedal without discomfort so I searched for handlebars extenders which would help us with this problem, nothing was long enough, I could use the bike because I?m taller, she was having problems, it?s not the bikes fault bowman it?s standard distancing on the They?re simply unwearable (and not even cheaper than the equivalent shoes direct from Adidas). They are relatively soft and excellent with socks. Its a really good book. We are satisfied with the overall look definitely should have been around the $50 price point for what you get but its in our shed and holding the bikes upright. Fit PERFECTLY.