Radial velocities of U Gem have been measured from individual components of the emission lines of the Balmer series, Ca II K, and He 14471, originating in the gaseous disk and in the hot spot of this binary system. These new data give K1 ≅ 143 km s−1 and Vdisk sin i ≅ 530 km s−1. The resulting mass of the primary component is m
1 = 1.1 ± 0.4 m
⊙ and the mass-ratio m
1 = 0.6 ± 0.2. Radial velocities and intensities of the emission components originating in the hot spot are also discussed.