During postflight inspection yesterday I noticed this. Not sure when it may have started; not noticed until this walkaround. These wheels have only seen some normal taxiing, one high speed taxi and five landings. The photo is of the left wheel; the right also showed signs of grease oozing past the seals but hadn't gotten enough out to fling onto the rims. Is this normal for new wheels? Should I be rechecking my bearing tightness? Any input on this output would be greatly appreciated.