It may not be the prettiest but I admire the Obree-ishness of the invention and design. Similarly I saw a set of tri-bars someone had designed and built themselves on one of the TT forums. He’d used his existing base bar and made the extensions himself, mainly from plumbing bits and bobs. He ended up with a completely custom set up that fit like a glove for less than a stock set up would’ve cost
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I take your point on the handling on tight bends, and road racing where it would be a nightmare to use, I was thinking more of a rider doing something similar for a TT during a stage race or a World Champs.
Although there would be a weight penalty on the increased sprocket size and chain etc, this might be able to be countered by using lightweight components like a KCNC billet cassette and other engineering/carbon witchcraft, after all there is a minimum bike weight and the manufacturers can get below this quite easily with stock kit. I wonder if anyone has tried it, I doubt it but with the amount of money they spend on wind tunnel testing you think it'd be worth slinging a bike in while you're there.