I commute on a touring bike. With fenders, fat tires, rack, lighting, 2 full water bottles, and trunk bag filled with basic bike supplies, I top 40 lbs. By the time I attach the rear panniers with some rain gear and lunch and clothes for the day, my bike is above 45 lbs. Not a problem for me. I probably drop about 1 to 1.5 mph of speed at this weight versus my sub 20 lb road bike, but I'm either commuting or touring and not racing. I'm out to enjoy the ride, so speed is not a big issue.