In the "firm" position it is essentially locked out under rider input such as standing and hammering to the top of the hill, but as soon as you hit a bump in the trail it will "unlock" and compress normally. Threshold or "Brain Fade" is adjustable on the fly from the crown mounted lever. I just got the fork back from the Specialized Service Center where they performed a full 150 Hour service (I will include paperwork showing this) so it has fresh seals, oil, nitrogen pellet in the Brain cart, etc.
Made in Italy, this part weighs a mere 35 or so grams and offers a cleaner look. Complete weight of the fork w/ X-Lock is 1580g or 3.5 lbs. The item "2015 RockShox SID Brain World Cup Suspension Fork 100mm travel, 15mm thru-axle" is in sale since Wednesday, March 02, 2016. This item is in the category "Sporting Goods\Cycling\Bicycle Components & Parts\Forks". The seller is "corybike" and is located in Tucson, Arizona.
This item can be shipped to United States.