If you want to update a rim brake frame, SRAM still has you covered with Force AXS shifters. Most 11 speed cranks work with 12 speed chains and the sprocket spacing on all three brands is so close that any of the cassettes that fit your wheels can work. I've already read reports from people using shimano 12 cassettes with sram. Some think the axs chain works best. Force shifters are about $460. I got a rival FD for $175 and a RD for $255. Both were easy to set up. Two batteries and a charger run about $150. I use shimano grx cranks for more range and better shifting.
Last edited by DaveSSS; 06-30-22 at 10:45 AM.