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Why does a tag axle on an MCI bus only have two tires total while a dual rear axle conversion has 4 tires per axle...?
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Because the tag axle on a bus is NOT driven, where the twin axles on most conversions are BOTH driven. Also, the tag on a bus is not rated for as much weight as the drive axle, hence the single wheels, but both driven axles on most trucks are rated for the same weight per axle, hence duallies all around.
Does this help clarify things a little?