I like to mix and match road and mtb equipment on my bikes. I like Shimano Deore XT derailleurs with DuraAce 9 spd barcons. My cranks are old Deore XT and Coda that I get on eBay. I am old and heavy and really appreciate a few really low gears on my bikes. Last week at the end of a hot day I had to climb the hill in Harper’s Ferry. Fortunately my gearing was low enough. I use a 94/58 crank with 20-32-42 rings with a 12-14-16-18-21-24-28-23-36 cluster. I rarely have to go to the granny, but when I have to it is there. The high is only about 95” but at my age that is fine.