Im about 6'2" and weigh 330 lbs. I do need to lose some weight but I normally ride anywheres from 15 to 20 miles per day at this weight on a MTB. Weekends I usually ride 30 to 40 miles in a few hours. I have been throwing around the idea of doing a century. How would I train? Do you do these in group rides, and how long do you have to complete it? Thanks. My bike is a trek 6500 with semi slicks on it.