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Re: Bike Spotting

Postby iab » September 7th, 2016, 3:55 pm


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I really can't comment on off-road riding and brake needs, I am 95% road and 5% gravel roads, but I can lock up my carbon rims in the wet. I have never been terrified with a dual-pivot caliper.

Now I do have a a bike from 1933 with long-reach single-pivot calipers with cork pads on wood rims. I recently did a challenge ride on it, 1000 ft of climbing (and descents) for every 10km. It was raining that day. On that day I certainly was concerned. :)

And I'll take 27mm tires at 75-85psi over 23s at 100-110 any day and in any condition.

Re: Bike Spotting

Postby slippyfish » September 7th, 2016, 4:36 pm

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A quite lovely Commencal DH bike prepped for this weekend's world championship race. George Brannigan, from (guess where)...

Black decals on polished aluminum, understated, classy, and just racey enough.

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Re: Bike Spotting

Postby jcharles00 » September 15th, 2016, 12:03 pm

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Here's another crazy looking tri bike. The interesting thing for me about this is that their design process started at the wheels. There's a video somewhere of the designer talking about how the best way to keep the wheels aero is to fill the space between them, and that's how the frame design evolved. Like most of these other "innovations" I don't know if I fully buy it, but I think it's a novel approach.
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Re: Bike Spotting

Postby slippyfish » September 15th, 2016, 12:16 pm

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Its kind of what Cervelo's original claim to fame was - how you could barely slip a playing card between the rear tire and the concave seat tube. In this case I'd be more concerned about the bike's performance in a cross wind, and the instability from the center of pressure being so far forward. I hadn't heard of the designer before (Kevin Quan Studio in Toronto) but he seems to do nice work judging from the other bikes he's worked on.

In my experience wind tunnel testing for bicycle design has been done for validation toward the end of a project, once the main design is already done. It is also helpful for athletes to get on the bike in the low speed tunnels to tweak their riding position since that will have a larger effect on drag. Specialized is the only major manufacturer that I know has their own tunnel so their ability to design with the aero factors should result in the best performing bikes (Venge, Shiv). DB is not a large manufacturer and tunnel time is expensive.
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Re: Bike Spotting

Postby jcharles00 » September 16th, 2016, 9:21 am

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slippyfish wrote:In my experience wind tunnel testing for bicycle design has been done for validation toward the end of a project, once the main design is already done. It is also helpful for athletes to get on the bike in the low speed tunnels to tweak their riding position since that will have a larger effect on drag. Specialized is the only major manufacturer that I know has their own tunnel so their ability to design with the aero factors should result in the best performing bikes (Venge, Shiv). DB is not a large manufacturer and tunnel time is expensive.


Since you're into test practices, you might enjoy this guy's blog.. here's one of his posts regarding using solid aluminum wheel prototypes for wind tunnel testing - http://rockets2sprockets.com/downhill-time-trials/ Real sharp aerospace engineer who is also a professional cyclist.

Re: Bike Spotting

Postby jacob fleisher » September 18th, 2016, 12:29 pm


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@jcharles00:

There's some super geek heaven in that site, thanks for the tip!
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Re: Bike Spotting

Postby slippyfish » October 19th, 2016, 3:31 pm

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Breaking my own OP rule but thought I'd add this concept bike from LeEco:

Do I think its overall gadgety stupidity? Yes. However. Having an easily accessed button to snap a photo while riding seems like an easy-to-implement and useful feature.

Turn signals, embedded headlights, fingerprint sensors...stupid.

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Re: Bike Spotting

Postby SophieHortonJones » October 20th, 2016, 1:48 pm

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Is that a 'Parking' button?!! I love the headline The Verge used on this: "LeEco's 'Super Bike' has enough gadgets to save your life or kill you — your call"!!

Re: Bike Spotting

Postby Sanu_Dutta » October 21st, 2016, 2:05 am


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I've just bought a new bike that is considerably longer than anything I've had before and I'm faster both uphill and down on it, I've spent 6 months demoing all sorts before taking the plunge. As soon as I rode it this bike just felt right and better than anything else I demo'd including both longer and shorter travel bikes. I do have a Schwinn protocol at the moment and I can't fault that to be honest, it's an awesome bike, just wish I went for 27.5 rather than the 29er. Anyways, it just my opinion you may even go for Nashbar or Diamondback kind of popular models.

Re: Bike Spotting

Postby jcharles00 » November 3rd, 2016, 3:14 pm

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a different looking take on rims from zipp - http://www.zipp.com/about/story.php?ID=763
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Re: Bike Spotting

Postby Cyberdemon » November 3rd, 2016, 3:27 pm

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jcharles00 wrote:a different looking take on rims from zipp - http://www.zipp.com/about/story.php?ID=763


That's super impressive. At a certain point you have to figure out what the $4000 investment will actually yield in terms of returns, but it's cool to see Formula 1 logic applied at the subcomponent level. The little dimples are pretty slick.

Re: Bike Spotting

Postby Robert_H_Moore » March 5th, 2017, 2:34 pm


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Cycling is my favorite outdoor activities . Since My childhood I am riding my bike to go to school , market and other place. My Father is government service holder and his salary was not good. But he managed money and bought a bike for myself when I age only 13 years. Since Than I am riding . My favorite riding is in mountain area.

Now a day cycling become more and more popular than it was before. In New York You will see lot of people riding cycle. It not only in USA but also all most all the countries young guys prefer cycling for keeping the body fit. Cycling is not only a Sport or outdoor activities also it is a great exercise. It will help to lose weight in natural way , help to keep yourself fit and smart. So I think everybody Should go for cycling.

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