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"# Titanium coil spring
# Updated graphics
# Lightest 8 inch travel fork on the market
# 1 1/8 inch steerer
# Stepped 20mm thru-axle
# Integrated disc brake guide
# Travel is internally adjustable to 6 inches, in half inch increments

The 40 comes in two models, the R and super-adjustable RC2, and is available in 7 and 8 inch travel models. The RC2 has externally adjustable high and low speed compression damping, and both models feature Fox's new FIT cartridge."
 

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nsmb website article...

Cut and past from nsmb website. Here is the link if you want to read the whole thing:
http://www.nsmb.com/gear/fox07_04_06.php

40 Forks
FOX's light, supple downhill fork remains unchanged for 2007 except:

Bottom-out control.
Same as the 36. It engages in the last 1.5 - 2 inches of travel, and the contact point is adjustable. This will improve the 40 for big-hit riding.

New graphics.
Sick!

Bottom-out control.
If there was any critique of 2006 36s and 40s it was that they were hungry for full travel. They'd just gobble it up every time they got a chance. Near the end of their travel a small piston would ride into a cylinder, which theoretically increased oil pressure and controlled bottom-outs. But the fit between the piston and cylinder was too loose, and those high oil pressures never happened. Weak sauce.

The new bottom-out control rocks the strong sauce. First, the cylinder is cone-shaped. Second, the piston has an "interference fit," which means it actually touches the inside of the cone. Third, the cone has four sets of holes along its height. When the piston first hits the cone, oil flows through all four ports. Then it squeezes oil through three ports, then two, then just one. The oil pressure builds up gradually, and it builds big.

The old bottom setup generated 80 pounds of bottom-out resistance. The new one generates 600 pounds. HUGE DIFFERENCE! The resistance starts around 1 1/4 inches from the bottom of the stroke and builds smoothly from there. And one more adjustment: The little piston can be moved up or down to engage the cone sooner or later.
 

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yeah that bottom out thing is interesting

i have an 05 40 and i use all the travel a good amount of the (sensible) time, have 1.9 inches of sag, and hardly ever have hard bottoms. I tend to go pretty big too, although i am a lighter and very smooth rider.

60 lbs resistance to 600----? excessive methinks, fox is moving into marzocchi realm........
 
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