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I converted madness from cast to spoke with dual discs I looked back and showed I lost 6 lbs but most of that was due to later model sport bike rotors.
Another reference Build Thread...Special to Cafe Bike
Only on perfectly smooth , flat ground, if moving. Lighter wheels maintain better contact with the road.(assuming here that oem cast wheels are heavier than oem spoked)
The ligthest wheels for an XS would be modern, forged aluminum or magnesium flat track wheels, or some 17" Blackstonetek carbon fiber wheels.
IIRC, my stock spoked wheel with oem alloy rim, a single 320 mm ISR disc (about 1.4 kg), 90/90-19 Pirelli MT60 weighs around 10 kg. I can double check this later.