  The shaping of group velocity dispersion in microresonators is an important
component in the generation of wideband optical frequency combs. Small
resonators - with tight bending radii - offer the large free-spectral range
desirable for wide comb formation. However, the tighter bending usually limit
comb formation as it enhances normal group velocity dispersion. We
experimentally demonstrate that engineering the sidewall angle of small-radius
(100 $\mu$m), 3 $\mu$m-thick silica wedge microdisks enables dispersion tuning
in both normal and anomalous regimes, without significantly affecting the free
spectral range. A microdisk with wedge angle of $55^{\circ}$ (anomalous
dispersion) is used to demonstrate a 300 nm bandwidth Kerr optical frequency
comb.
