The magnetostriction of CuGcO(3) single crystals has been measured in
the temperature range from 5 to 16 K in magnetic fields up to 12 T. Gi
ant values of the magnetostrictive strains along the b-axis is observe
d near the phase transition from the dimerized phase to the high field
magnetic phase. The field induced magnetostriction in the antiferroma
gnetic phase is considerably smaller than in the dimerized phase.