i have read that the more sodium in ones diet the more gets lost in sweat and urine. so the less salt you eat on a day to day basis the less you will need extra salt while exercising. i know for me the longest i have ridden is around 40 miles but i didn't need any electrolytes, i did snack the whole ride though. i wasn't sore after and didn't feel very worn out or tired. planing to finally do 50 miles soon. i know this isn't really very long compared to how many miles most of you ride so maybe doesn't really compare at all.