It looks like there are three bearings involved in the SSA assembly. The maintenance schedule in the shop manual indicates the following: "Rear wheel bearing - lubricate (single sided swing arm only)", at 12000 and 24000 mile intervals. However, the small owners hand book provided with the bike makes no mention of this requirement. Are the two main bearings sealed or do they require lubrication? Is any body familiar with this bearing configuration and any lubrication requirements? Thanks.