Tool/tube bag for each bike, pump for each bike. I only have two, but even if I had ten that I rode regularly they would all have their own. No lights on my mtb and no computer on my commuter. Currently building a light for the mtb that uses the same battery as one of my commuter lights but will clamp on the bar instead of bolted onto the rack. If I needed a computer on my "townie", I`d probably look for one of those with wheel 1 and wheel 2 features. Might do that anyway cause I`m dying for a VDO with altimeter and they come set up for two bikes (or two wheel sizes).