Originally Posted by eghaley

In June, I rode Bicycle Across Kansas (BAK) during days when the temps ranged from 95 to 103F. One day I had to visit the hospital for an IV after a diagnosis of dehydration. That's the first time that happened even after a few RAGBRAI rides of similar heat. You can be sure I upped my water and G2 Gatorade.

But it didn't seem to make a difference when I got home and rode on hot days. After about 30 miles, I started bonking and had to quit. Never happened before. I felt great after 15 miles of warmup and could hammer quite well. But once I reached 25 miles, I began getting short of breath and very tired. So I began to think it was something other than dehydration. Long story short, after trying a few modifications, the problems stopped after I quit taking baby aspirins every other day. I had to be free of aspirin for 4 days or so to have a trouble free ride of 50 miles or so. I guess thinning out your blood isn't conducive to bike riding long distances (my long days are 85 miles).