Rode the ZR bent 24 mi. on the TJ evans trail from Newark to Johnstown. 1.5 mile from the trailhead my chain came off the single ring. As coasting to a stop I saw the chainring wobble. 3 aluminum chainring bolts were gone, 2 loose. The 2 piece spider was also loose. Glad this happened before I sold it.
Also checked out the Horns Hill downhill runs in Newark. They are no joke, steep ,gap jumps, lot of loose rock berms though.