Almost all 6WD's I've seen used in FRC had fixed wheel locations. I don't really think there's any advantage to making the wheel heights adjustable in most games or on most game fields. On occasion, some teams will make the 4 outer wheels adjustable along the length of the drive train to allow for chain tensioning, but again the height from the floor does not change.
From what I've seen, 1/2" Hex is just a bit more common to find parts for. AM makes 1/2 Hex bearings and 1/2" hex wheels that have already been proven in competition.
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Originally Posted by Katie_UPS
I'm fairly certain (correct me if I'm wrong) that most of the six wheel drives in FRC are never truely "six wheels touching the floor driving" type drives (unless its a six wheel swerve).
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25 has been using their 6WD since 2002/2003 and all 6 wheels touch the floor. It works fantastically for them.