Shimano 10 speed 5701 105 chain
If you fit this chain make sure you put it on as per the instructions. I Ignored the paper work at first and so was plagued with very poor gear shifts from the rear cassette. Fiddled and fiddled then read the paperwork and then got the correct side facing outboard. It really is that critical. Also thank goodness for a KMC "missing link", expensive for what it is but it made this job much easier.