Thanks for all the info. The first time it happened it was both feet. The other day I tried a different pair of shoes and it only happened to one foot. Both times the rides were about 20 miles, temperature was about 50 degrees or colder. I did have a bike fitting when I picked up the bike but I had only my jeans with me and not shorts. They told me I could come back for fine tuning the fit. The bike shop is a 3 hour drive (I live in the middle of nowhere) so I won't be able to just stop in without making a special trip. I will start to look for some shoes with a stiffer sole or maybe some bike shoes. Any suggestions?