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Tires may not offset it, not sure how heavy Kona tires where.
BUT Kona put cheap heavy Bottom Bracket in there bikes. Even the Explosif still had a UN-5x in it.
the Ti bottom bracket will offset most your weight
  ( just under a  1/3 lb  save there 
)
ok check the tires (scatch/Sniff = 575g inner tubes probably saves you 20/30g each)
so ~ 2/3 lb for the tires/tubes and bottom bracket saved.
				
			BUT Kona put cheap heavy Bottom Bracket in there bikes. Even the Explosif still had a UN-5x in it.
the Ti bottom bracket will offset most your weight
ok check the tires (scatch/Sniff = 575g inner tubes probably saves you 20/30g each)
so ~ 2/3 lb for the tires/tubes and bottom bracket saved.