Anyone know the difference in compounds in the above Michelin slicks? I've seen reference to both, with FR-2.0 being referred to variously as "newer", but nothing suggesting what the actual difference is. I'm going to order some from sticky slicks, but just want to be sure I'm getting the right stuff!

Not sure what the numbers mean, but the 16-54s I'm currently using have FR-2.0 on them.. They're OK.