Plate diameter and anthropometry.

[gadders]

My least favorite part of the deadlift is dragging the bar over my nuts. Plate diameter won’t change that.

Pretty sure my nuts add at least a kilo to the bar when doing shrugs. And that's just the left one.

[KeithI]

If your arms are that short, maybe you shouldn't deadlift to lockout.

That’s simpler than my idea of welding up some extension handles with sleeves that bolt around the bar.