84: 4, no make that 5

phfffft
thump-thump-thump
hisss
thud


in less than 2 months, four flats.
so new inner tubes, outer (between tube and tire) and inner (between tube and rim) liners.


a day later:  pop....    one of my new tubes blew open, a defective tube it seems.


kevlar--you know the stuff they make bullet-proof vests out of?  they also make tires--that may be my next purchase; in the meantime I've borrowed one of my wife's bikes.