[quote=Fairmont;7137232]
I guess I'm trying to guess at how often I can expect a flat riding four miles each way in those conditions.
3200 miles before I had one. It was a link from a chain bracelet. Hooked into rear tire.
Arriving late to work is a huge problem. I won't get in trouble, really, but it is very awkward to call the office and ask them to cover for me. I'm a teacher, and I have to arrive before the students or they are lined up outside the classroom.
Carry a spare tube, pump, levers. Takes about 5 to 10 minutes to change a tube.
Are flats common on street tires?
Yes