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budget friendly
Scilly Suffolk has nailed it, Vuka Alumina (the old ones, not the new ones) is the right choice because of the huge range of adjustment available. You are going to end up trying a lot of adjustments on your first set of tribars. While there are cheaper options ab initio, they start to look more expensive when you run out of adjustment and have to buy another different set. Profile T series would be the other option for the same reason, but the Zipps are nicer.
Deda Crono Nero or Profile Airwing would be a sound cheap base bar.
Could anyone suggest some budget friendly base bars and extensions?
My first aerobars kinda deal