In Reply To:
...features the very highest carbon-to-fiber ratio (70/30) in the industry...
Do you mind if I ask what "carbon-to-fiber" ratio is? Are you referring to the carbon-fiber to glass-fiber ratio used in the frame?
Other than that, your post is not really an answer to what makes a GURU fast. It is, rather, the stock answer that custom builders always give about what makes a custom bike better than an off the shelf bike. I dislike this argument a great deal, because simply put, custom geometry does not equal comfort. Correct position equals comfort. Just because I have a custom bike, it doesn't mean my position is good. There are a TON of stock bikes out there. It is rare to find someone that doesn't fit pretty darn well on stock bike. Ever wonder why all the CSC guys ride in almost identical positions? Because there is a consistency of positioning. We are not all beautiful and unique snowflakes. Custom does not guarantee a good fit. In fact, I would argue that you are just as likely to see a crap position on a custom bike as you are on a stock bike. Frames are rarely the limiter to a good position. And given that most people will usually fit one of several frames, then the frame itself does matter. So if I can get in the exact same position on a Felt DA as on a Guru Crono, then wouldn't I want whichever of those frames is actually aerodynamically superior? What is perhaps more likely is that if someone buys a GURU, they MUST get fit for it. Whereas I can buy a Felt DA in the mail. So really, that's an argument for FIT, not for custom.
In terms of stability, that's really an issue most often with long legged riders who need more wheelbase. But more and more bikes are being built with plenty of front center. That's really the ONLY issue facing tribikes in terms of handling, and most of the good ones have addressed it. I don't see at all that it is rarely brought up. It is entirely the thinking behind the front end geometry of, most notably, Cannondale's and Specialized's new bikes. Custom is an advantage for short-torsoed/long-legged riders (who are the most likely candidates for custom bikes), but that's a small percentage of riders, and even among those riders, a good fitter can still usually provide several options, though of course you may be slightly restricted on what aerobars you can ride, but that's a relatively small price (and even that is likely debateable given the adjustability of most modern aerobars). I'd honestly be very surprised if the geometry of the bikes you built for any of your pro athletes was not remarkably similar to two or three of the bikes we have in our database. I'd wager that I could fit everyone of those athletes, with less than 10mm of spacers, on a handful of stock bikes that have basically indentical geometry in all aspects that matter.
The last point is also mostly marketing speak. Is Desiree equipped with an internal strain gauge monitor? I'm not too worried about power transfer on most bikes, since I am pretty sure I put out less power than David Millar or Fabian Cancellara or George Hincapie or Alberto Contador, none of whom seem to have too much trouble with their frames wobbling underneath them. What is that optimal point of stiffness/compliance? And how do you find it? I'd argue that's a purely subjective point, where I think you'd be hard pressed to find any company with a distinct advantage (among those that actually invest in carbon fiber development).
So, as semi polished as what you've written here is. It's also remarkably obvious that you are part of the marketing department. Now, even within that understanding, I don't see that you've written too much here on why I'd actually want a Guru. You've given me plenty of reasons to get a custom (sort of), but why wouldn't I just go buy a Parlee (for example)?
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