Worst rims I ever used for causing pinch flats were the old Sun Ringle Doubletrack/Intense MAG 30s. insanely strong. You could ride the rim with a flat without dinging them on most tracks but you had to run crazy high pressures so you wouldn't have to.That's exactly what I'm saying because it's true. You should try the newer grade wheels if when/you kill those old triangle ones. Those older ones cut into tires more like the old mavic rims. The new ones don't. Plus lighter.