The main purpose of lifting weights is to build and maintain muscle and strength, especially important as we age and get older. I highly doubt that lifting weights even for high reps will have any significant improvement on long distance endurance...A typical endurance ride is few hours long, a typical weight training session is only 45 - 60 minutes long....Doing 25 - 30 rep sets will build some muscle and strength and improve your overall health and fitness but it won't do much for bike endurance....To get get better at endurance you need to spend time in the saddle and ride regularly...