Out here in WA. state you can ride BICYCLES on the INTERSTATE
in rural areas so some brave souls ride from snoqualime pass (5000-7000 ft elv. I think) back towards Seattle at like 50 -70 mph! is that DOWNHILL ENOUGH!

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XC here, no downhill in NJ / DE
Glad to see there are more Mountain Bikers on here.
LOOKOUT - old guy weighing in. I worked at a bike shop fo 6.5 years before there was any such thing as suspension on a mountain bike. One good thing was that Cannondale would sell us anything at 1/2 retail price since we were dealers. My first MB had a ~14 inch bb and after I took off the big chainring, was (for the time) a great trials bike. My kayaking buddy and I would bomb downhill power line trails and stuff all the time until he hit a tree and separated his shoulder. My mountain bike now is a vintage (that's what we call ourselves) Gary Fisher that is pristine.
I was more into road bikes and collected tons and tons of old vintage Campy stuff. I sold a 50th anniversary gruppo to some lady off ebay for $5500 three years ago. Hmm, for pro bikes, my first was a Pinarello, then Olmo, then an Italian Masi with Renyolds tubing, Masi with Reynolds 753, big-fat Cannondale, some funky French aluminum framed thing I can't think of the name of, 1'st gen Trek carbon fiber etc. Too many bikes left - all of them are on tubulars. I've got probably 40 tires hanging in the basement.