bicycle tire

[http://dummy.us.eu.org/robert (Robert)]

I was realizing that my rear bicycle tire has become very worn over the
years.  (I guess tires wear faster when more weight is put upon them.
Doesn't exactly make sense, but there's probably some physics and/or
chemistry which explains it.)

Anyway, I'm wary of riding on the tire too long.  If I get time, I'll
replace it, but I may just take the bus until I get the time.