yes i understand the concept of the tri align charlie
its for a customers bike , before i order the wrong thing .. surely the tri align means a different depth of adaptor to a shimano caliper which just bolts on or am i being stupid ?
I had a hayes calliper on a avid mount without trialign or washers so i think it is the size of the avid callipers that lets you fit the trialign. So an avid on a shimano mount will still mean trialign fits.