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There's two problems with publishing wind tunnel data. The data will vary for the same item from tunnel to tunnel because the testing apparatuses are different. The second is competitive. Even if you are the leader, publishing your data may be harmful if you're not far ahead. It was mentioned previously that the Zipp combo is drastically cheaper than a Comete/Io, and if it is slower it may be so close that it doesn't matter. If people see no real cost:benefit, then who's going to pay for all the wheels that get given to National federations?
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Agreed.
I don’t think they even *claim* to be the fastest. They only write, “Totally reinvented for the 2016 Rio Olympics, the iO is faster than ever.” |
Originally Posted by carleton
(Post 20010605)
This is so easy for Mavic to settle by publishing wind tunnel data. I find it curious that they do not. I also find it curious that they don’t offer a 5 spoke for the meticulous road TT crowd.
Personally, I’m convinced that the 808 is faster. From the first golfball solution from 2007 (?), trough the strange bulb design from 2010 with very narrow tubular glue berth, to the large firecrest up to the strange "new" design... |
Originally Posted by Clythio
(Post 20011750)
Which 808? It changed a lot with time.
From the first golfball solution from 2007 (?), trough the strange bulb design from 2010 with very narrow tubular glue berth, to the large firecrest up to the strange "new" design... |
All versions of the 808 are fast. The original fully toroidal rim from 2006-2010 is the one that was tested against the IO years ago and found to be essentially equal. The wider 808 Firecrest is faster with wider tires (22-23 is ideal) and has better performance in crosswinds. Zipp themselves discontinued the 900 front track disc because they said an 808 firecrest front wheels is faster.
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Originally Posted by rustymongrel
(Post 20012218)
All versions of the 808 are fast. The original fully toroidal rim from 2006-2010 is the one that was tested against the IO years ago and found to be essentially equal. The wider 808 Firecrest is faster with wider tires (22-23 is ideal) and has better performance in crosswinds. Zipp themselves discontinued the 900 front track disc because they said an 808 firecrest front wheels is faster.
Do you have a link to a source on that info? |
Originally Posted by rustymongrel
(Post 20012218)
All versions of the 808 are fast. The original fully toroidal rim from 2006-2010 is the one that was tested against the IO years ago and found to be essentially equal. The wider 808 Firecrest is faster with wider tires (22-23 is ideal) and has better performance in crosswinds. Zipp themselves discontinued the 900 front track disc because they said an 808 firecrest front wheels is faster.
~2009 or 2010 stickers became white and the bulb changed avoiding the flat brake surface, it's more bulge and round but the glue berth became very narrow, and deformation on tires should makes it slower, not from the aero point but from the energy consumption on rolling resistance. Worst with high g on turns. So, the large tire berth of Firecrests, allowing wider tires remain supported even under high banked turns, should be the best. I have a set of those 2010 "real bulb" white stickers 808 - track spoke counting and track hub on the front - and even with the 15mm wide tubular bed (yes 15mm) they "feel" fast all the time, and some non-scientific numbers I have for the second lap on 500m TT training sections showed it as good as a ShimanoPro 5 spokes I use to consider a "race wheel"... As the data I'm talking about for those second laps is speed/power (Powertap), I´m one more with the idea of 808s being competitive from the aerodynamic point of view. |
Originally Posted by carleton
(Post 20013169)
Wow. I wondered about what happened to their front disc. I've only seen a couple in photos from US track racers around 2009 or so.
Do you have a link to a source on that info? |
Originally Posted by rustymongrel
(Post 20013425)
Zipp says it on their disc timeline page at the bottom: Zipp - Speed Weaponry | Support | Identify Zipp Products | Zipp Discs Through Time
In early August 2014, the long-serving 900 tubular track front disc was discontinued after over 20 years in production. The 808 Firecrest front wheel with a track legal skewer is now faster and lighter and suggested as an ideal substitute. |
New SRM mount options. A lot cheaper than past options too: https://www.shapeways.com/shops/amag...SRM+Mounts&s=0
They have other computer mount options as well. |
Originally Posted by topflightpro
(Post 20019495)
New SRM mount options. A lot cheaper than past options too: https://www.shapeways.com/shops/amag...SRM+Mounts&s=0
They have other computer mount options as well. I think Mike Zagorski (also a trackie) sells his metal one for about $75. Shapeways is interesting. Basically, you design something using 3D modeling software and upload it to their site then you open your "store". People can then order your design to be printed and shipped directly from Shapeways. This is why they don't come with the nuts and bolt, becasue the seller never touches them and Shapeways doesn't have the nuts and bolts. |
Here is the one I was talking about. It's made of aluminum:
https://www.etsy.com/listing/451930778/srm-rail-mount https://img0.etsystatic.com/108/0/13...46814_phzv.jpg https://img1.etsystatic.com/112/0/13...75383_hsiv.jpg |
I'm under the impression that you have to have an Instagram page in order to be a track sprinter these days.
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Sam Webster using the Vision cranks:
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Originally Posted by spartanKid
(Post 20022881)
If you dig through IG some more, you'll find evidence of Theo Bos as well as Webster, Dawkins, and Mitchell all riding the vision cranks.
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Originally Posted by carleton
(Post 20022108)
I'm under the impression that you have to have an Instagram page in order to be a track sprinter these days.
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Originally Posted by Baby Puke
(Post 20022919)
Perhaps an Avanti tie-in?
Originally Posted by JimiMimni
(Post 20023101)
It's a great media outlet. I enjoy almost all of the content I've found on there, as opposed to Wastebook.
I'd imagine that IG is the easiest and most painless popular social media platform. That and Twitter. +1 on "Wastebook" :thumb: |
Originally Posted by carleton
(Post 20023282)
Good call.
I was thinking about this last night and it occurred to me that they probably have "Social Media Obligations" as part of their sponsorships. READ: If you want free stuff, you have to promote it on social media. I'd imagine that IG is the easiest and most painless popular social media platform. That and Twitter. +1 on "Wastebook" :thumb: |
Originally Posted by southernfox
(Post 20025533)
All of my personal sponsorships include pretty explicit social media activity requirements. IG is generally the most preferred, with Facebook being a distant second. One post per week (or one per month), per sponsor, are the typical asks.
It's odd that IG is preferred when IG has explicit rules against advertising. There was an NPR story about how celebrities make thousands of dollars per post when they passively (and actively) endorse something. It's obviously a softly enforced rule and I'm not sure why it's in place to start. The K*********s now have a week to take those posts down, or Truth in Advertising will notify the Federal Trade Commission (FTC), which in turn could open an official investigation. The group found undisclosed product placement on the Instagram accounts of five K********* siblings, which collectively advertised more than two dozen companies without proper disclosures. ... FTC regulations require journalists, celebrities and other media personalities to disclose their relationship with companies if they are reimbursed for a review or endorsement. These regulations were initially put in place to make sure TV show hosts wouldn’t advertise products without proper disclosures on air, but have since been adapted to the social media age. *(I'll be damned if I ever write their name and promote them, hahaha) |
Found an article on France's 3D printed sprint bars.
https://www.3ders.org/articles/20160...-olympics.html Comes with a video where you can practice your French. |
Russia Banned From Winter Olympics by I.O.C.
LAUSANNE, Switzerland — Russia’s Olympic team has been barred from the 2018 Winter Games in Pyeongchang, South Korea. The country’s government officials are forbidden to attend, its flag will not be displayed at the opening ceremony and its anthem will not sound. Any athletes from Russia who receive special dispensation to compete will do so as individuals wearing a neutral uniform, and the official record books will forever show that Russia won zero medals. That was the punishment issued Tuesday to the proud sports juggernaut that has long used the Olympics as a show of global force but was exposed for systematic doping in previously unfathomable ways. The International Olympic Committee, after completing its own prolonged investigations that reiterated what had been known for more than a year, handed Russia penalties for doping so severe they were without precedent in Olympics history. The ruling was the final confirmation that the nation was guilty of executing an extensive state-backed doping program. The scheme was rivaled perhaps only by the notorious program conducted by East Germany throughout the 1960s, ’70s and ’80s. The sprinter, who will have dual Australian-Russian nationality, felt the switch was his best chance of being able to compete at the 2020 Olympics in Tokyo. |
Can't say I didn't see that one coming. Too bad for Shane, but he did make the decision to choose a nation that was already suspected of systemic doping.
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If you watch the Icarus doco movie the IOC decision regarding the Brazilian Olympics stinks of corruption. I would say that this is a "slap on the wrist" punishment in lieu of the punishment that the world demanded to be dished out in Brazil and that they will now be given a clean slate by the IOC to attend the Olympics in Japan. "Watch this space"
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Originally Posted by taras0000
(Post 20035244)
Can't say I didn't see that one coming. Too bad for Shane, but he did make the decision to choose a nation that was already suspected of systemic doping.
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I wonder how long it will take for Dr. Grigoriy Rodchenkov to turn up dead. This is a huge embarrassment for Russia. You can bet their radar is focused on him now more than ever.
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Originally Posted by Baby Puke
(Post 20035341)
The stuff I've read suggests this will only affect the next winter Olympics, so Share should be ok.
If the doping was sanctioned by the highest sporting orgs in the country, it’s not a stretch to assume that summer event athletes were involved, too. I’m not alluding to Perkins doping. Quite the opposite. He could be one of the clean athletes that has to suffer because of what higher-ups chose to do. |
If anyone was looking for custom carbon bars and such - main
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Originally Posted by taras0000
(Post 20036013)
If anyone was looking for custom carbon bars and such - main
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Originally Posted by taras0000
(Post 20036013)
If anyone was looking for custom carbon bars and such - main
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Originally Posted by SyntaxMonstr
(Post 20036849)
Friend of mine tried them out and complained they were really flexy. He's a sprinter but doesn't put out stupid power. Just something to be aware of.
Originally Posted by brawlo
(Post 20037500)
They all look like bars like that Predator company were doing. Just standard bars and stems wrapped in some carbon to become integrated. Not my cup'o'tea but if they sell then good luck to them
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