Every year, it seems I am on a training ride 5-10 miles from home and while torquing up, I snap the hanger throwing the rear derailleur into my spokes and locking up my rear wheel. I am 205lbs and 5'10" and still squat pretty heavy so I am wondering if the combination of my weight and my force is wearing out the hangers quickly causing this and if there is a known way to check this for fatigue before I get on the road. I use a 2012 GTR Series 5 aluminum bike. If I ask at a bike shop, they will just try and sell me a tri bike. I want a tri bike but I don't want one if it wont change anything in my sprint and olympic tri experience.