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Group theoretical factors from GUT symmetry breaking can lead to predictionsfor the ratios of quark and lepton masses (or Yukawa couplings) at theunification scale. Due to supersymmetric (SUSY) threshold corrections theviability of such predictions can depend strongly on the SUSY parameters. Forthree common minimal SUSY breaking scenarios with anomaly, gauge and gravitymediation we investigate which GUT scale ratios $m_e/m_d$, $m_\mu/m_s$,$y_\tau/y_b$ and $y_t/y_b$ are allowed when phenomenological constraints fromelectroweak precision observables, $B$ physics, $(g-2)_\mu$, mass-limits onsparticles from direct searches as well as, optionally, constraints from theobserved dark matter density are taken into account. We derive possible newpredictions for the GUT scale mass ratios and compare them with thephenomenologically allowed ranges. We find that new GUT scale predictions suchas $m_\mu/m_s = 9/2$ or 6 and $y_\tau/y_b = 3/2$ or 2 are often favouredcompared to the ubiquitous relations $m_\mu/m_s = 3$ or $y_\tau/y_b =1$. Theyare viable for characteristic SUSY scenarios, testable at the CERN LHC andfuture colliders.

New GUT predictions for quark and lepton mass ratios confronted with phenomenology