DH: 8+8", coils F[HTML_REMOVED]R, 2.5 2ply tires, 1x9 36X11-23 gearing, low, slack, 37-40lbs.
FR: 7+7", coil F[HTML_REMOVED]R, 2.5 2ply, 2X9 or 1X10 32X11-36, 35-39lbs.
AM: 6+6", air F[HTML_REMOVED]R w/lockout, 2X9 or 1X10, 30-36lbs, depending on build and tires. With 2.5 2plys and a strong build, these bikes are 90% as capable as a 7" coil bike, and climb far better, way more fun to ride on mellower trails.
With midweight 2.5 EXO tires, on light kevlar 2.2 1plys, they are a pleasure on good old fashioned singletrack, where the FR bike is sluggish.
All depends on what you are riding:
Garbanzo: DH A. FR B. AM C. SS D. AM HT D.
Dirt Merch/platinum: SS A. AM B. FR B. DH B-. AM HT B.
Gnar trail, steep, burl, big jumps: DH A-. FR A. AM B. SS C. AM HT C.
blue/black shore: AM A. FR B. SS B. AM HT B. DH C.
tight, rolly singletrack: AM HT A. AM A-. SS B. FR B-. DH C.
fire road climb: AM HT A. AM B. FR C. SS C+. DH D.
techy climbing: AM HT A. AM A-. FR C-. SS C. DH FAIL.
Some of the best riders in my area, swear by the FR bike, 7+7" coil, DH tires, and wide gearing. They primarily ride and build super gnar trails you have to climb for, and there is no better bike for that. Pretty fun at Whistler, too. Passable for regular trails.
Most people are going towards the lighter 6+6" bikes with lockout. More fun on mellower trails, lighter and more versitle. If you want one bike, and primarily ride blue-black trails like Ladies and Pipeline, but want to hit the park occasionally, and maybe a few epic XC roadtrips to Fruita, Moab, Sedona, Bend, etc, this is the bike.
2 bikes: DH bike and a 6+6 light AM, 29 5+5 AM, or 29 AM HT is the way to go.