anyone know what s2b s2a are in relation to dunlops?

Haven't a clue to be honest but lifted this off the Michelin site, you'd know by pinching the tyre if they felt soft then you know that s1a/b is close to x22's.

Im sure there is somone out there to give you better info.

P = Tyre type (S for Slick; P for Rain)
2 = Compound
A = Evolution