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At this point I'm trying to figure out the Shimano disc rotor compatibility chart.
My bike came with SM RT 81 S (160mm) and 81 SS (140mm)rotors. The calipers are BR RS 505 both front and rear. My rotors are lasting about 1 or 1.5 years.
I found a Shimano chart online but I'm not sure how to use it exactly. The 160mm (81 S) seems to be out of stock at a number of places including Merlin and Universal. It looks like an alternative is SM RT 99 SS and 99 S. These have an additional heatsink, which I think I need. These are also out of stock at Merlin.
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Sold: 1989 3.2 coupe, 112k miles
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