I purchased a 'Blackburn Ex 1 Disc Rack' and 'Axiom Seat Collar w/ Rack Eyelets'. The installations instructions for the rack could be a bit more detailed; however, with some experimentations, the rack fit quite well. Note the rack came with lots of associate hardware. I used only part of hardware and presume the rest would be for other bike fittings. I used it for 2 months without any issues preparing for a short trial tour in May and then a longer tour in July. Unfortunately, both were canceled due to the pandemic. I took the rack off the bike and placed it in storage for next year. I do know others (with this rack) who keep it on their bikes permanent to carry extra "stuff" on regular rides. I am very pleased with the Blackburn rack. There is a minor limitation worth noting. The rack attaches at 2 points: at the seat collar and on the rear bike skewer that is provided with the rack. Fixing a flat on the rear tire will require detaching the rack to pull the wheel for the tire repair. This will require a little extra time to repair a flat. My plan was to put a new tire on the rear before the tour to minimize the need to repair a flat. Hope the preceding helps and May The Wind Be To your Back.