Yeah, almost 100% the tires. The weight on them is way out at the edge of the wheel where it has the most effect. Unless you're Michael Schumacher you're not going to notice that little bit of spacer mass around the hub... until the wheel shears off because you forgot to periodically torque them or something. 
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2009 370z #206 (all mods are Home Depot)
2009 Ducati 848 (full Ohlins, Termignoni, etc)
2003 Grand Cherokee (long arms, big tires, 4.56, lockers)
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