We were there less than 2 wks ago. Just an FYI that most of the BB trails are poorly marked, if at all, and many have multiple names. Not sure what kind of mtb'ing you're into, but as Intermediate XC'er my favorites are "Pirates" (aka "Speedos") and "Pine Knot" (aka "1E01") on the Snow Summit side. Be sure to take 1E01 ALL THE WAY DOWN at least once rather than turning prematurely back to Snow Summit on the Grandview Loop. 1E01 is great! Once in the Village, grab lunch and a beer b4 heading back to the cars via the signed "Bike Route" (quiet roads behind BB Blvd).
On the North Shore, "Grout Bay" (aka "Hanna Flat", "Area 51", "Fawnskin") is truly a blast-- a wonderful rollercoaster ST. Lots of ups & downs thru the forest; upper trailhead is at Hanna Flat campground appx above & behind campsite #49. Lower trailhead is at Grout Bay/Grey's Peak parking on 38 less than a mile west of Fawnskin. You can make a loop of it or go out 'n back. Along the way-- optional climb to Grey's Peak.
I was in a mixed group, m/f, of varying ages & abilities, and everyone loved these trails.
Have fun!