Bumpers and the Frame Perimeter

[Steve W]

[R02]
The Robot must satisfy the following size constraints:
A. horizontal dimensions must not exceed 28 by 38 in.,
B. the absolute height must not exceed 84 in.,
C. the height of the Robot at the start of the match must not exceed 60 in.,
D. any appendage may not extend more than 14 in. beyond the frame perimeter, and
E. no other part of the Robot may extend beyond the vertical projection of the Frame Perimeter (with the
exception of minor protrusions permitted per 0).
Expect to demonstrate the Robot’s ability to constrain itself to the envelope defined in
Rule 0 to Inspectors.
Please refer to Section 3: The Game for Robot spec ific dimension constraints during the
Match.
If a Robot is designed as intended and pushed up against a vertical wall (with Bumpers
removed and appendages retracted), only the Frame Perimeter (or its minor protrusions)
will be in contact with the wall.

As an LRI it seems clear to me. The bumpers are to be fastened to the frame so how do wheels fit in?