u/Downtown-Reference30

Hey so I am able to buy Vivid pink tarmac SL8 for decent price 5000USD, its used on ultegra di2 and arc1600 wheelset, 110 stem length. I have never tried anything from specialized i talked a bit with chatgpt regarding size since its 54 and it says it its okey for me. I am 5’11, 83cm inseam and 80cm arm length. The bike i had before its size 56 trek domane.
I would have done a bike fit but i am on vacation currently and i am not sure if i should pull the trigger, wait and do bike fit(the used bike might be sold by that time) or should i wait for SL9.