It would be easier to ride a distance like that with a group of people you like or at least tolerate... I've ridden 3 century rides and only one was even close to a 4 hour ride (like 4:10 or so), the rest were closer to 4:40 or so and I didn't hook up with a group. It does depend on you fitness level.
I'm 6'3" and almost 300# myself now, but even at my best cycling shape I was still 205-215... I can't "spin" for long, damn long legs, so I have to gear and grunt it all out. One of my MTBs I had a 52t chainring for the big ring. It did make a difference. Sometimes in training I pulled my trailer with 50# of weight in it up to 30 MPH in sprints behind my roady. I might not have been able to spin, but I could sprint for a bit. And climb hills.
Now, I'm just happy to get up the hill at all. First ride with the club this weekend (my 4x4 club that is, getting a few other fat butts like me out on the bikes...).
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When it comes to Heroes, RENEGADES are mine!
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