[Chris_Ely]

See the last blue box of Section 4.1.

Originally Posted by 2015 Game Manual, Section 4.1

Veteran teams will notice that this Manual does not contain rules for bumpers. Bumpers for Recycle Rush robots are optional. Teams, however, should give
serious consideration as to whether or not they would like to add bumpers to their robots to provide protection from impact. Suggested bumper designs can
be found here.
Bumpers, if present, are considered part of the robot, and are included as part of the robot size constraints per R3 and weight limit per R4. This also means
that bumpers are not exempt from Fabrication Schedule requirements per Section 4.5: Fabrication Schedule.
Bumpers, if present, do not need to change color to match Alliance color. This means a single set of bumpers may stay affixed to the robot throughout the
event, if the team desires.

Bumpers are considered part of the robot.