From Halopedia, the Halo wiki
RTPCS rims are the rims used by the M12 Warthog. These rims were factory equipped on the 2553 Hog, but are swapped out for the RJM 36" 7c rims on the standard model.
The rims on the Warthog in Halo 2.
The rims on the Warthog in Halo 3.