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Old 06-25-18, 12:17 PM
  #26  
merlinextraligh
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Join Date: Aug 2005
Location: Jacksonville
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Bikes: Wilier Zero 7; Merlin Extralight; Co-Motion Robusta; Schwinn Paramount; Motobecane Phantom Cross; Cervelo P2; Motebecane Ti Fly 29er; Calfee Dragonfly Tandem

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[QUOTE=OneIsAllYouNeed;20411267]Tandem frames made of steel, titanium, or carbon fiber can all be made "whippy", overly stiff, or somewhere in between. Historically, many titanium tandem frames have been on the whippy end of the spectrum. Tubing and couplers weren't readily available in sufficient diameter for boom tubes; chainstays were the same as single bikes; bottom bracket standards limited space in the most critical location. Comparing a modern, well thought-out Ti frame to an older design, there are substantial differences in lateral stiffness. All the Ti frames mentioned in this thread -- Santana, Granite, DaVinci -- shouldn't disappoint on lateral stiffness. I haven't ridden a Calfee, but I've piloted quite a few Ti tandems. Ti tandems can definitely be made stiff enough for two powerful 200lb athletes; they can also be made to mimic a vintage noodley frame. A good builder should be able to make the bike feel the way the client wants.[/QUOTE]


Not at the same weight. You can make a Ti Tandem as stiff as Calfee Dragonfly, but it would weigh a lot more. Carbon Fiber has a stiffness to weight ratio 4 times higher than TI:




To build a latereless open frame Ti tandem that approached the rigidity of a Calfee Dragonfly with the extra stiffness option, you'd be adding some seriously heavier tubes.



There's a reason that Ti has pretty much vanished from the high end racing market.
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Last edited by merlinextraligh; 06-25-18 at 12:25 PM.
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