SHODWN:
89-92 are the same.
would you like to see a parts pic for this upgrade?
if its even an upgrade, but it sure looks better...
89's are different in the rear, I'll get back to you with the specs.
Perry Toledo,ohio
Ok, here's the scoop. Rear calipers and brackets are identical 89 thru 92. Rotors, hubs, and mounting plates are different. For 89 the rotor hat height is 3mm less than the 92. At the same time, the 89 rotor hat surface is 3mm thicker than a 92. The mounting plate on an 89 is flush on the inside where the caliper bracket bolts to it. For 92 the mounting plate is recessed 3mm where the caliper bracket bolts up. The 3mm offset on the mounting plate exactly corresponds with the 3mm increase in rotor hat height on a 92 rotor. That places the 89 calipers 3mm closer to the slicers, or the 92 calipers 3mm farther from the slicers. Depends on which way you look at it. In both cases the mounting surface of the slicer is the same distance from the control arms, so the wheel is in the same place in both wheel wells. By combining parts (92 rotor and mounting plate)you can push the wheel on an 89 in by 3mm, moving it 3mm closer to the strut. You cannot move the 89 wheel out by combining parts. A 92 is different, it already has 3mm wider hubs, but the rotor hat is 3mm thinner so that cancels out. You can take a 92, put 89 mounting plates on it,(that pushes the caliper out 3mm), then add 89 rotors(with the 3mm shorter hat) so everything matches up.That moves the caliper out 3mm. As a plus, the 89 rotor has a thicker hat surface,,you guessed it, by 3mm. That thicker hat moves the slicer out 3mm. Now as if this isn't confusing enough,,,, You can put a 95 hub (3mm thinner than a 92) on a 92, plus a front 10" composite rotor (3mm shorter hat, and the hat is 3mm thinner) and pull the wheel in 3mm. Kind of fine tune the wheel placement for custom wheels or something like that. In summation, an 89 can come in by 3mm. A 92 can either go out 3mm, or in 3mm from stock. 89 and 92 rear hubs/spindles have completely different bearing setups and are not interchangeable. I played with a lot of parts in the basement to figure this out, hope I remembered it all correctly.
Did you guys notice the 10" front rotors have a thin hat?? That means a 96 upgrade, with thicker rotor hats, increases your front track by about 3mm per side. That effectively changes the front slicers to a 39mm offset, and a 36mm wheel to a 33mm wheel!!! Something to keep in mind when buying wheels.
I'll have to look at some of the front 10" setups, did they all have the same thickness rotor hats up front??? If different could it be possible the hubs are different too??? I know the 89 has a smaller center ring for the rotor, but what about the hub thickness? Back to the basement for more experimenting!!!!
Perry Toledo,Ohio
<small>[ March 29, 2003, 09:41 AM: Message edited by: pjtoledo ]</small>
