Been so long, don't remember what I have. The parts should arrive tomorrow and then I should have a better idea. Giant has a 3 ring crank and standard shimano cassette on rear, think just standard 11 speed cassette. Darn lost my sheet with gear ratios, etc. bummer. Need to look for backups. The Trek uses a compact double crank ring, ,which I was very very scared of trying as thought would be too little for steep hills, but worked out ok.