Originally Posted by GeneO

A short 20 mile at Waterfall Glen, by Argonne National lab. Was a pleasant day in the 80s.

Very dry and dusty on the trails around here and they have put a fresh thin layer of fine limestone powder on the limestone parts. I have to clean and lube my bike after every ride because of this - a real pain. I can't imagine what it is doing to lungs - the stuff hardens like cement when it gets wet.

Back to 32 mi commuting tomorrow.