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4x4 Truck Unit Bearings Diagram

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Tapered roller bearings are designed to converge at a common point. When that point or axis is modified, it upsets the geometry of the bearing. When you increase the offset of your wheel and enlarge the diameter of the tire, it upsets the original bearing preset and compromises the unit's strength, thus resulting in premature wear and possible failure.
4x4 Truck Unit Bearning System - Small Wonders

Tapered roller bearings are designed to converge at a common point. When that point or axis is modified, it upsets the geometry of the bearing. When you increase the offset of your wheel and enlarge the diameter of the tire, it upsets the original bearing preset and compromises the unit's strength, thus resulting in premature wear and possible failure.  View Related Article