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It was previously noted that SU(5) unification can be achieved via the simpleaddition of light scalar leptoquarks from two split $\bf10$ multiplets. Weexplore the parameter space of this model in detail and find that unificationrequires at least one leptoquark to have mass below $\approx16\,$TeV. We pointout that introducing splitting of the $\bf24$ allows the unification scale tobe raised beyond $10^{16}$ GeV, while a U(1)$_{PQ}$ symmetry can be imposed toforbid dangerous proton decay mediated by the light leptoquarks. The latestbounds from LHC searches are combined and we find that a leptoquark as light as400 GeV is still permitted. Finally, we discuss the interesting possibilitythat the leptoquarks required for unification could also be responsible for the$2.6\sigma$ deviation observed in the ratio $R_K$ at LHCb.

SU(5) Unification with TeV-scale Leptoquarks