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It's a tough one. Here's what I've looked into today: Bearings are the same from 81-93, so that's not it. One earlier poster confirmed that his 86 uses the shorter height hats, 1 5/8". Calipers for all the vented rotors are the same from 81 up according to FCPG. No one seems to sell hubs, so I could not check that. I suspect the difference may be there. I don't think the spindle/strut unit changes. The hat height won't affect wheel offset unless the top of the hat is thicker. It's the position of the lug bolt flange that dictates where the top of the hat sits. Think of it going backwards. For some reason, if what the 1 5/8 poster said is true (that his hat is shorter like the oddball discs I have) the flange position is further in toward the backplate, allowing for the shorter hat to locate the disc comfortably inside the rotor (on the 86 he mentioned). If Volvo did go to a taller hub, then a taller hat would be required to get the disc back to the original spot. Maybe they wanted a larger grease cavity? Maybe they were indeed widening the track a little?
DS
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