Interesting theory.

Bryan: I believe the reason a disc makes a bike more stable is that it moves the center of pressure rearward.

I would wait....you have no idea what Cervelo or Specialized or Cannondale is coming out with!

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Yes and I believe the entire "sail" attached to the rear axle and the contact patch on the ground underneath it moves it all backwards. Even though the downtube fairing looks like it is close to the front wheel, it is really attached to and should affect mainly the rear wheel, so how it affects bike handling "should" apply to forces on the rear wheel directly and only very in directly to the front wheel (the only connection to front wheel is how rigid you body is between the saddle and your elbows, because on the bike itself, that down tube fairing should have zero connection to the front wheel given the presence of a rotating headset.

Not just a theory. Matt Weaver described this effect and how he capitalized upon it when building his 'Cutting Edge' human powered vehicle (or 'speedbike', as he likes to call them). See his article in the September/December 1991 issue of Cycling Science.

Was the typo in the thread title intentional?

no. oops. let me fix that

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Make Inside Out Sports your next online tri shop! http://www.insideoutsports.com/

Scott had one way back in '14. Everyone just thought that was Kienle's descent tuck.

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ECMGN Therapy Silicon Valley:
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Same here. this bike brings us back to the day when tri industry was trying all sorts of crazy stuff. I think of my old Trimble Aero TT bike, it had an internal storage space and looked crazy back in early 1990's.

I love the new look of this DB and am excited about this new design. I usually ride older technology because 8 yr old 'top of the line' bikes don't give up much at all to present design. 99 % were versions of the original Aluminum Cervelo P3's. However, I do applaud the new beam bikes and Lotus inspired designs.

Great job DB on breaking the mold and trying something new. Triathlon has always been a platform for new ideas and designs and I like to see people pushing the envelope.

Looks like a fat hippo..absolutely disgusting.

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Too bad, I thought it was brilliant. Instead, I guess it was merely Freudian.

Ha! This was my bike that I eventually sold.

Just saw this pic that looks at old to me and looks similar to the lines of the new DB.

Agree.

But at least Cannondale is now stain-free

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wovebike.com | Wove on instagram

I think putting data from those two different tests on the same chart is a big mistake. Just look at their Serios data from the old test vs. the new - there is about a 90g difference at 0 yaw! Clearly at a minimum the protocols were different and likely a host of other things going on too...

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Ed O'Malley
www.VeloVetta.com
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I'm choosing to believe this was said non-ironically, and is therefore my single favorite statement of this thread.

I always thought hippos were kinda cute but with some muscle behind them!

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Maybe someone will bring back the Black Hole?

http://bicycledesign.net/2010/03/a-hubless-wheel-from-the-past-the-black-hole/


Also reminds me of some of Ruegamer's work back in the day...


http://www.bike-trend.com/blackbird-bike-concept-time-trial-machine-by-ruegamer-bicycle/


Gotta admit, kinda geeking out over all the new 2-wheeled goodness. I may not be in the market for one now or in the near future, but it reminds of the early to mid-90's when there were a lot of new "aero" designs coming out (some that turned out to be actually aero, others...not so much). Wonder what will still be around in 10-15-20yrs time...

x2

Classic Coggan right there.

Edit: Holy hell. I actually found it online. Maybe I should eat my words.

I wasn't thrilled by the disparity and thought about whether it was worth doing.
Obviously I decided it was ;)
Felt that giving a bit of visual context to the 'much faster than Serios' was worthwhile. In the absence of a proper white paper with full scale mannequin testing compared to existing bikes we have to rely on inference and rudimentary comparisons.
That they talk so much about their SLA models and process but don't provide real comparative data is a bit suspicious.

Yes, because unless something can be found online, it doesn't exist.


Friggin' millennials...

So I read through that... where would the ideal center of pressure be for TT purposes?

If that's the case, then why aren't rear discs MANDATORY in Kona, as opposed to banned? ;-)

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As to the reply to at what point the lower area becomes a fairing. If it is a useful storage or structure of the bike its not a fairing. I like this design look at the amount of fit adjustments available, I should be able to precisely tune it to the athletes fit coordinates. Good job Diamondback

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Robert Driskell
Certified Master Body Geometry fit Technician
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Bikes Plus Pensacola Florida

I'm surprised this hasn't been posted yet...here's a data point from the intro video showing Weiss in the San Diego LSWT tunnel:



Considering that CdA typically drops at yaw with a rider on board in a good aero position (plus the bike-only data shown so far has the drag minimum at 15d), AND the position shown in the video (rider looking straight down), I hate to say that's not overly impressive...

Edit: fixed the tunnel name. Plus, want to point out the raw data shown includes fixture drag, so subtract ~.005 for that.

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