i have a Trek ds 8.3,i am or was 300lbs when i started a month ago,i am now at 295 and have almost 100 miles on my bike,no roads but i have ridden it on some paved trails but now i am finding myself riding more on gravel forestry rds.so far nothing has broke or feels like its going to break under my weight,i have upgraded my tires to 29's and i added the thud buster for comfort,my ass still gets sore after a few hrs but other than that i am comfortable.

the only real reason i upgraded the tires is i felt i was going to damage the rims riding on the gravel rds,the stock ones were 700-38..


Not trying to confuse the OP anymore just throwing another option out there.