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Definitely need new wheels for mine after realising how much heavier they made my brooklyn compared to yours!
I don't think there's much you can do by swapping wheels alone.
I managed pretty well previously to get it down to 8.8kg by simply swapping the fork from the 1.2kg Clusterfork to a 350g carbon Easton CX fork It also got a pair of brakes, so in theory, 8.4kg is doable).
It used to have Open Pro laced to those rear generic cartridge bearing hubs and road front hubs (both 32h), oh and stupidly skinny 23mm tyres.
Perhaps Archetype in 32h and the Kinesis CX fork should make a very noticable difference, I think just swapping the fork is probably the cheapest way of dropping 500-600g easily (have to be the Kinesis as it got the same a-t-c as Brooklyn's own).
I'm very up for a gangsta ride if ones happens, part cx and would be much fun too.
Sorry @laner