replaced rront tire few days ago, manual call out to replace caliper bolts. My question is: why replace the bolts? have not read requirement to replace on older bikes or cars that I can think of. so, did manufactures decide on cheaper steel or some new discovery of vulnerabilty? have run across requirement on some engines head bolts but head bolts torque to 80 lbs vs 40 lbs for caliber bolts. what do u think or should I say, what do u know as fact.