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Cougrrcj ... Wouldn't be at all surprised if barcons are accepted -- a ban on those would just be silly. They probably said "downtube shifters" to keep brifters out of the equation and bar-end shifters didn't occur to them. Of course this is all speculation. Maybe contact them and report back?
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A race bike in any era is a highly personal choice that at its "best" balances the requirements of fit, weight, handling, durability and cost tempered by the willingness to toss it and oneself down the pavement at considerable speed. ~Bandera