In my experience, the handlebars upgrade is a lot more than $3-$4/lb. I'm still on Ritchey 26 mm Al bars. I've been quite tempted by Schmolke, which check in at around 100 grams saved for I think 370 Euros. But still over the threshold. But to get 190 gram carbon bars saves me only around 45 grams on the bars alone, and then I'd need to go to a heavier 31.8 mm stem adding both mass and cost.

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Fuji SL/1
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Yeah, carbon handlebars are really expensive for what you get in terms of weight saving. The counter argument is that they may be able to reduce 'road buzz' but I would have thought that tape/gloves would take care of that.

I'll run through some numbers from the spreadsheet when I get home.