A bearing cap for a wheel assembly includes a bearing cap seal for sealing against an annular bore of a knuckle. The bearing cap is coupled to an outer ring, which is disposed within an annular bore of a knuckle. The bearing cap includes a face and a collar extending along a longitudinal axis into the annular bore. The bearing cap seal is disposed annularly about the collar, within the annular bore. The bearing cap seal prevents contamination of an engagement interface between the knuckle and the outer ring.