Classic 36h wheel design is tough stuff. Not really paying attention I ran over Road Closed barricade that someone had knocked down in the shadows, I might have been going about 18mph. I had about 2 secs. to lift off the seat and absorb the shock. Guy behind me said it looked like I was skiing moguls. I was a metric century day, finished the ride without drama, wheels stayed true. Araya rims, 1989, 25c Ultremo R1 tires.