"Paragon Mountain bike arrived in two months as promised. Out-of-the-box, good bike as advertised except rear disc brake non-functional. My first mistake was not returning the bike immediately. Being a rookie with disc brakes, not wanting to wait another two months for a replacement, and unaware of the potential cost/complexity of repair, I took it to my local bike mechanic. He worked with Shimano in a multi step diagnosis/repair process, after which Shimano declared it defective and sent a free replacement (thumbs up Shimano!). Unfortunately, the unexpected labor was not free. My second mistake was not going through Bikes Online repair process. As clearly stated in the warranty, if you don’t go through their process then Bikes Online won’t pay a dime to fix defective parts they shipped. Live and learn. Good bike. Advise to return immediately if not perfect on the box."