I've been looking but haven't found a specific answer in archived posts (prolly exists, but I haven't been able to find it.) I would like to upgrade my Guerc, currently running 8-speed Shimano 600 tricolor - to 10-speed. I currently have new wheels (Rol volants)
ultegra 10-speed cassette, chain and R701 STI. My LBS told me I also needed new "10-speed" chainrings and a new front derailleur. My reading is that the 10-speed chains had the same internal dimension (3/32' or something along those lines), but were made of thinner metal to allow them to slip between the thinner spacing on the cassettes.
(Also, many chainrings are sold as 9/10 speed chainrings.) So, do I really need new chainrings and a new FD, or do I need a new mechanic (laugh).