I weigh 190lbs and my bike and gear another 40lbs so that's 230lbs total. I found 25mm Gatorskins to be perfect for trail riding. I rode the Erie Canal from Troy to Buffalo and had no problems. The tires were good over the hard packed gravel and even the muddier bits were easily ridden. When trees blocked the path or I needed to get over some standing water it was easy to pick up my bike. For serious off road they would not have worked well, but for fire trails 25mm or 28mm training tires are fine IMHO.