I posted this Airborne Zeppelin back in 2018, but I just finished rebuilding it. It did have a mix of 9 speed Tiagra 4500, 105, Ultegra 6500, which I switched out to all 10 speed Ultegra 6700 components., except the 5700 STI levers. The crankset is 50/34 with a 12/28 cassette. I got a really good price on the group from a couple of different sellers. The whole group is in great shape with not much use. I also switched out the saddle, handlebar and tape, stem and bags, tires, and cables/housing. While I had it torn down to bare frame/fork, I used blue Scothbrite pads with Goo Gone, then soap and water, and then polished with wax and finally lubed all. The bike is looking really fine and everything is operating very well. Definitely going to put a lot of time and miles on this one in 2021.