C-type asteroid
The largest unequivocally C-type asteroid is 10 Hygiea, although the SMASS classification places the largest asteroid, 1 Ceres, here as well, because that scheme lacks a G-type.
13241 Biyo
The asteroid has not been surveyed by none of the space-based telescopes, such as the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer. The "Collaborative Asteroid Lightcurve Link" assumes an albedo for a stony asteroid of 0.24 – derived from 8 Flora, the largest member and namesake of this orbital family – and calculates a diameter of 3.92 kilometers with an absolute magnitude of 14.2.