I'm new to riding and do about 2x30 mi. during week and 35 mi. on w/e. My diet is clean with good amount of pro and carb. My thighs started burning so bad at 40 mi. this w/e, I had to get off and walk 2mi. Should I train through this? Can I do a scheduled ride of 45 mi. this w/e? Should I gear down? I'm trying to train for the HotterN' Hell in Tx.( in Aug, 100 miles)