  The Standard Model is extended by a SU(2)L singlet of vector leptoquarks. An
additional SU(4) gauge symmetry between right-handed up quarks and right-handed
leptons is introduced to render the model renormalizable. The arrangement is
made in such a way that no conflict with low energy restrictions is
encountered. The SU(2)L singlet mediates interactions between the right-handed
leptons and up type quarks for which only moderate low energy restrictions
M(LQ)/g(LQ) > few hundred GeV exist. We cancel the anomalies of the model and
furthermore argue that the inequality g(LQ) > g(QCD) is a general feature of
consistent vector leptoquark models. Although our model is not relevant for
HERA, it is interesting per se as a description of leptoquarks of mass < 1 TeV
consistent with all low-energy requirements.
