I have a Specialized Secteur with a Sora 3x 9-speed crankset and drivechain and am looking to upgrade to the Tiagra 2x 10-speed crankset 52/36t (as I need a bigger top gear and never use my smallest chainring).
I'd like to keep as much of my existing mechanical setup as possible (shifters, cassette, front & rear derailleurs, chain & BB), and am seeking advice on what I would need to complete this upgrade and what would you recommend I also upgrade - e.g. cassette and/or chain, etc
Thanks.