monala

A light film of greasy dirt can happen with freshly packed wheel bearings, especially when the dust caps are more of a shield than a true seal, but you definitely shouldn’t see excessive grease constantly flinging out from both sides. If the TBS bearings were overpacked at assembly, the heat from use can force extra grease past the caps, so checking the packing amount and making sure the caps fit snugly is a smart move before it turns into overheating or contamination issues. Post edited to remove commercial links

A small amount of grease mist or greasy dirt around the wheels can be fairly normal, especially if the wheel bearings were packed generously from the factory, but it should not be constantly pushing grease out heavily on both sides. Those thin dust caps are usually not true seals, so excess grease can work its way out once the bearings warm up during taxi and landing rolls. It’s worth pulling a wheel apart to confirm the bearings were not overpacked and that the caps are seated properly, because too much grease can create heat and force its way past the caps more easily.