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A ConMet representative said I have a “small-backface” hub. What does that mean?

April 26, 2017conmet Hub mean representative said

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A ConMet representative said I have a “small-backface” hub. What does that mean?

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A small-backface hub has a flange outer diameter that is slightly smaller than usual. Hubs of this type were made specifically to clear the inside of certain drums that do not meet SAE J1671 recommendations. Most drums do not require this special modification.