Re cycling, very good until last year. Last year - not so good. Very good re everything else.

Regarding your tire...I was on a ride in the Delaware Water Gap area of NJ with a group of friends, and we all hit 50+ mph on a big downhill. The guy I rode up with was putting his bike on the car at the end of the ride and noticed that the entire tread surface of rear tire was gone. He was lucky that day.