I've used both 60 & 65 on a 42" deck & the 65s are definitely a lot better, mostly because they pick up speed a lot faster, will last longer & slide just as well as the 60mm version.
I'ved used 98a & 96a respectively to 60 & 65 versions.
Just pick a size. Wheel size on a slide board is god damn preference, so you won't figure out by asking on the fish.
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