I was around 220lb and I rode various vintage steel bikes regularly. I bought a carbon SuperSix and put 20,000 miles on it before I sold it to someone else. Frame was great but I did go through a couple sets of wheels. My weight did drop to around 190 but now after covid I ballooned up to 250lb before I tried biking again. I am back on my vintage stuff mostly a 2000 Pinarello
(steel/carbon frame) and a 2022 Trek 920.touring bike. I just built up a Master x Light for some motivation trying to get back down to at least 200lbs. I am 6' tall and have bike that range from 56 to 60 cm. My most comfortable ones are the 58cm (Colnago Master, Bob Jackson, Trek 920) and the least comfortable bike was the 56cm SuperSix I sold.