Originally Posted by justonwo

Hey there. It means the spindles will be 8 mm longer than the stock XTR spindles (which have a Q factor of 55 mm). So you’ll be able to remove your stock spindles (the solid metal shaft around which the pedal rotates) from your XTR pedals and replace them with identical spindles 8 mm longer. Much more elegant than a pedal extender and much safer.