Enve Melee 54cm complete bike. Has room for 15mm of spacers, SRAM Red AXS group 12 speed, 35/48 chainrings, 10-36 cassette, 172.5 cranks, setback post, Enve Selle Italia SLR Boost saddle, Zipp 303 Firecrest wheels, Continental GP500 700x30mm tires, Ceramic Bearings in Hubs, Kogel Ceramic Bottom bracket- Big upgrade is the bar/stem. Bike comes with Enve 100 -7 stem, 40 CM Enve AR bar.