235 isn't that heavy so I wouldn't really worry about it. I ride with several 250-270lb guys. The 270lb guy broke a few frames but I've also broke a frame at 160lbs being stupid and jumping to flat without enough air in my fork. The biggest problem the big guys have is destroying cheap rear hubs. They usually ride whatever the bike comes with and then upgrade to a DT Swiss 240 once the stock hub blows up.