Quote:
Originally Posted by Hachiban VIII
Unpowered idlers of any type are a horrible waste of normal force.
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In most cases, yes. However, this is a special case, in that the wheel does not need to support any of the robot's weight, it is being used only for instrumentation. If the speed sensing wheel is attached to a hinged arm, and carries only it's own weight, then it should not affect robot performance noticeably.