BB30? BBPurdy! - NYVelocity 本当のuggs

BB30? BBPurdy!

Sensei desmystifies new standard

BB30, a new bottom bracket standard invented by Cannondale in 2000, is gaining momentum. With a bigger 30mm spindle and pressed-in bearings, BB30 is designed to be lighter and stiffer, with an enormous shell that could make the frame stiffer as well. Given the industry’s inexorable movement towards bigger diameter and stiffer components, BB30 could well become the standard in a few years. I took a trip to Mark Purdy’s shop to have a Quarq BB30 Cinqo installed and find out more about the system.

My BH came with these simple and elegant adapter cups to take the BB30 shell down to the Shimano standard. These will have to be knocked out first.

Here’s that big spindle. There’s a ‘preload adjuster’ to take up the slack in the system with a set screw to lock it in. Purdy points out that it’s not technically setting preload, like in a cup and cone system. Cartridge bearings don’t need to be preloaded to keep things in line, in fact, they should have minimal axial load. The adjuster just takes out the slop in the system. Some cranksets use a wave ring instead, both work fine.

Purdy first knocks the bearings out of the BH adapter cups, then uses a headset removal tool to remove the cups. This is a rare appearance for the headset tool since the advent of internal headsets.

There’s the shell, a smooth bore with two channels. More on those channels later.

Here’s what you get with a bearing kit: 2 outer plates, 2 bearings, and 2 circlips. 60 grams total, or approximately 40 grams less than an outboard BB.

The ever fastidious Purdy cleans the shell with acetone and digs the loctite out of the channels with a dental pick. After he finished with my bike he gave me a root canal.

After greasing, the circlips are snapped into those channels. They serve as a backstop for the bearings.

Since the BB30 shell is completely sealed inside the frame, Purdy recommends taking out the inboard bearing seals to lower friction a touch.

Bearing, less one seal.

The Park BB30 tool set includes a bearing knockout tool as well as adapters for pressing the bearings.

Here’s another tool making a cameo appearance. The Park headset press is used to install the bearings. Purdy adds just a touch of pressure after he feels the bearings bottom out on the circlips.

Bearings in, slightly recessed. The need for specialized tools pretty much preclude the home mechanic from attempting this job.

The non drive side crankarm goes in.

The drive side, with a collar slipped over the spindle. Next to it is a magnet for the Quarq Cinqo.

Drive side bolted on with a giant torque wrench.

Slop taken out with the preload adjuster and set in place with a 2mm allen.

Purdy fine tunes the front shifting.

All done. Despite the weight saved and stiffness gained, Purdy does have a few reservations about the system.

A chain is only as strong as its weakest link, so when you make the crankset stiffer, flex simply migrates to other places. The first Shimano outboard BB cranks made some frames flex so much that it ruined front derailleur shifting. With each step up in crank stiffness frame designers have had to respond in kind and increase frame stiffness as well. While this improves drivetrain efficiency, Purdy wonders if comfort is being sacrificed.

The non drive side crank sits pretty far outboard of the shell, which means the crank takes a fairly straight shot to the pedal axle. This increases the likelihood of heel strikes and wear on the crankarm surface.

Also, the press fit interfaces of BB30 can be a source of creaks. Mechanics differ on whether the interface should have grease, loctite, or nothing at all. Purdy prefers grease, and stresses that careful installation is the key to silent operation.

Finally, there is no tool for milling the shell. If the shell diameter is off, bearings can be compressed when installed. This is bad for steel bearings, but terrible for ceramic bearings, which are less elastic. Purdy looks forward to the introduction of a milling tool so he can confidently recommend ceramic bearings if a customer requests it. UPDATE: The tool is now available, and now Purdy reams out every BB30 frame to ensure proper fit. Make sure your shop has the tool if you’re having your BB30 bike built there.

And the verdict? I really believe in the power of suggestion, so I hate to report ‘sensations’. But the already fantastic BH G5 felt great – smooth, stiff, silent. I was also happy to find that my heel never rubbed the non drive side crankarm, despite the fact that I use Speedplays. If you don’t want to trust my subjective opinions (and you shouldn’t), consider this equally useless piece of evidence. Schmalz exceeded his current max wattage by 50 watts on his G5 with a Sram Force crankset (measured with a Powertap, which is downstream of the crank/BB), and he placed third in field sprint the day he got his bike. So there you go, BB30 is magic.

Have questions about BB30? Post them below and Purdy will respond.

52 Comments

Aaron

How does MP much charge to replace FSA BB30 bearings including parts and labor?

Stoffel

It is clear that I will not be able to do this myself and I guess it will have to be done at some point and Aaron, if it is the bike I’m thinking of, I think Mark would be able to make a huge difference to your setup.

Titouan Seatpost

http://www.enduroforkseals.com/id195.html

also ti-prep can be used on the bearings

Simon Chainring

just happy to see you?

http://nyvelocity.com/files/u18/IMG_2845.jpg

Aurelien Post

http://velonews.competitor.com/2010/04/bikes-tech/fsa-components-and-sram-and-zipp-wheels_113384

FSA BB30 reamer

Mathieu Hammer

I think Mark needs to go back to the bearded look.

Angelita

I wass able how to get more instagram followers free
find good information from your articles.

Salvestro Tracknut

schmalz, giro live feed links?

schmalz

Cycling fans always consolidates the video, audio and net links.

http://www.cyclingfans.com/node/791

The Sensei

Aaron– I charge $40 for the labor to remove your old setup and install new. The bearings can range from about $60 for good old steel up to $160 or more for Ceramic.

Titouan– That is indeed a good tool kit, but the number of times an individual is likely to use it, it may not be worth it. You can come in to my shop and use a fully equipped workstaion for $20/hour. You have access to every tool in the place and I’m around to answer any questions and make sure nothing goes horribly wrong.

Aurelien– Unfortunately, the FSA tool isn’t available, yet. I am eagerly awaiting it’s arrival, though.

FYI, The full beard is a winter thing. It’s too hot in the summer!

Remi Setscrew

universal sports

700x25

“Since the BB30 shell is completely sealed inside the frame, Purdy recommends taking out the inboard bearing seals to lower friction a touch.”
Nice helpful bit of information- shows how little my mechanic knows.

Seppe Compliant

Any one have any feed back to share?

Senne Chainsuck

if you pop the inner-facing seals, won’t grease trickle out as the bearings spin?

продажа ugg bootsmment-author vcard"> Battaglin the Baguine

And you thought it was juice…. he removed all his bearing seals! Now we know.

Rinaldo Seattube

This guy is simply the best we have.
It is so worth the trip to get it done right the first time every time.
Keep it up Mark.

The Sensei

Please don’t rush home tonight and rip all the seals off every bearing. Although seals do add some drag, they also perform a critical function. Some seals are more necessary than others. If you remove any seal, it will allow the lubricant to go away a bit faster, thus requiring more frequent serviceing. On your race bike you have a choice to make. lower friction or longer life. Just like with tires, you can put on a thick, super durable tire that is heavy and rides like shit… or you can use light, fast race day rubber that punctures more easily. That’s a choice you as the rider get to make. This is another one of those choices. Removing a seal is not the appropriate move for everyone. But if you regularly maintain your bike and want to scrub off any unnecesary friction then go for it. If you have a dedicated TT bike tht you only ride a handful of times each year, then removing all the seals. Seal drag is probably costing you in the neighborhood of 20 watts on your hubs, Der. pulleys and BB bearings. But you have to pull the bike apart, clean it and re-lube everything after each ride
本当のuggs

uggs outlet butik
uggs fear
uggs a buon mercato
ugg poser

Zipp Sub 9 Disk Tested

Homemade wind tunnel

 

Zipp’s Sub 9 is the perfect storm of geek. First of all, it’s TT equipment. TT = nerd. Secondly, Zipp claims it produces thrust in a 15 degree crosswind. Physics = pocket protector. Finally, it gives me another chance to build a homemade wind tunnel to verify Zipp’s claims (I love debunking dishonest marketing). Science experiments = atomic wedgies! But enough about my high school experiences. On to the geek.

 

 

For a history of the development of the Sub 9, and a quick explanation of the sail effect, go here. I came up with a very simple low friction rig to measure the relatively tiny forces. A steel rod goes through the test wheel’s skewer hole. One end of the rod rests and pivots on a monofilament loop, while the other end is supported by another wheel, which rolls on a tabletop. To test the concept, I put together the basic rig and held a Vornado fan in front of the test wheel. With the fan pointed straight on, the wheel got pushed back. With the fan at an angle, the wheel moved towards the fan like a horror movie zombie. Amazing. The claims of thrust are absolutely legit.

 

Then I remembered something I heard. Paul Lew said that pretty much any disk wheel will produce thrust in a crosswind. Maybe Zipp just happens to be the first (or most cynical) to market it. I put my flat Zipp disk in the rig and…the same thing happened! This is not totally surprising, considering that any ol’ piece of cardboard will fly like a frisbee. So is the Sub 9 a clever piece of marketing that touts something a sheet of plywood can do, or is it an honest innovation that produces so much more thrust that it warrants Zipp’s claims? It was time to build a tunnel to isolate the wheel, and rent a high power fan.

 

I enclosed the wheel and fan in set paper. A string and pulley system pulled at the end of the wheel support rod to measure the thrust force. Since the forces in question were so small, the setup was very sensitive to tiny errors. The table had to be perfectly level, the support wheel had to be perfectly balanced. Even then, we’re talking about a wheel suspended on a bowed rod, held by string at one end, supported on the other by a wheel listing from the weight of the test wheel. The whole contraption rattles and shakes when the fan is on. Let’s just say that this test is far from perfect, and if you want to discount my results entirely I won’t argue with you.

 

Here’s the numbers. Measurements were taken at approximately 15 degrees and 22 mph:

 

Sub 9 disk with Zipp Tangente tubular: 62 grams

Clincher disk tubeless with Hutchinson Fusion: 29 grams

Zipp Tubular flat disk with Schwalbe Stelvio: 28.3 grams

808 front with Schwalbe Stelvio: 18.3 grams

 

Duchamp inspired pulley system records the forces and doubles as a cat toy.

 

Zipp’s site claims 80g at 15 degrees, but doesn’t specify wind speed. If Zipp’s measurements were taken at 25 mph, then my numbers are dead on. If it was taken at the more typical 30 mph, then my numbers are way off. The front 808 number is there just for fun. A front hub should have much less drag than a rear hub, so you can’t compare it to the rear disks.

 

So it seems the Sub 9 does generate enough extra lift to be considered a whole new class of wheel. But here’s where the marketing talk gets slightly squirrelly. I don’t doubt that at some wind speed you can get 80g of thrust from this wheel, but that’s only a 43 gram improvement compared to a flat disk. Now, let’s assume my numbers are reliable. At 28 mph the Sub 9 would generate 54 grams more thrust than a flat disk. For a rider with 2400 grams of drag at 28 mph, that would translate to 24 seconds saved over 40k. And that’s the best case scenario, where the wind stays at an optimal 15 degree angle over the whole ride. Also, it’s pretty safe to say that the wheel would perform best in isolation rather than at the back of a bike, right behind two churning legs.

 

So far I’ve only had the chance to ride the clincher outside, and it seems to be much less skittish than the flat disk. Maybe that bulge is absorbing some shock, maybe I’m imagining things. I’ll be grabbing some people to help me do side by side tests for ride quality.

 

So in the end we’re talking about an $1875 wheel with undeniable geek appeal that saves you 24 seconds over 40k. We cyclists spend so much money on gear I won’t comment on whether that’s money well spent. The wheel should be faster, it’s up to you to decide if it’s worth it.

 

 

143 Comments

Anonymous

Your cat is adorable!

Anonymous

You got to attach the steel rod so that wheels slide forward not rotate…

Anonymous

odd that it is April Fools day. Last April Fools we had a full scale “wind tunnel.” You’ve lost all your credibility. I’m not even sure if the cat is real or photoshopped at this point.

Anonymous

odd how you step in front of the camera every time the wheel moves forward…

Felicia

Even with the shift toward service industries, the
troubled production sector continues to be Victoria’s single biggest employer and revenue producer.
Yes, there is a very high ratio of gossips to those who are engaging in activities that give rise to
gossip, but that is to be expected in any small town. By going to boom beach Hack beach cheat,
you’ll be able to come to be much more empowered as you discover huge portions
of tips with this specialized niche subject.

Flossie

Of course, as with anyy work-at-home offer, one may want to verify that thee company
is operatinng legally n the area through a betger business
network. -No Addvertising and marketing – No Facebook, Twitter, Tumblr or anything
or that type. Most people, when fasced with unemployment, cut back on some of the
luxuries in theior life.

My web page :: google sniper 3.0

Ambrose

With thanks, Numerous facts.

xunjie 絶対に欠かせない花柄のスカート。
エレガントな雰囲気!十分な別の仕事をHentianだけでなく、
特別賞•市長マイケル·R·ブルームバーグユージニアシェパード賞•キャンディプラッツ価格の会長 gaga

Riley

You explained it fantastically.
xunjie 全体的なトーンはより調和です。
ベルベット豪華なベルベットのタイトサークルスタンド、
ハリウッド女優が法の3次元形状感から眉ブラシで/セクシーなゲジゲジ眉毛はなぜ/眉ゲルを着た人、

Anonymous

Did you ever return Steve Goldman’s investment in your wind tunnel venture?

Anonymous

Actually, if anything, the wind tunnel stunt gave you tons of credibility.

Dont listen to em Andy, keep them guessing!

Anonymous

After a careful read, i think this is real. Or I’m very fooled, great piece. Ingenious either way for sure

Anonymous

What is the cat looking at? Fishy, very fishy

Anonymous

I’ve met the cat. He’s a good cat.

Boyd

What a data of un-ambiguity and preserveness of valuable experience about
unpredicted feelings.

My page; windows 7 activator

Maddison

Effectively spoken of course. .
xunjie 美しい英国の中産階級の女の子のための – – 1アメリカ英語を言う時間彼女はまた、
ハイファッションハウスへのブランド。
オックスフォードからロンドンにバスを利用するまで、

Anonymous

Can you do the same test on a HED 3? They also claim forward thrust in a side wind.

Anonymous

creating the computer-generated cat must have been the most expensive part of that shoot

Ludie

Greetings from California! I’m bored at work so I decided to
check out your website uggs on sale my
iphone during lunch break. I enjoy the information you present here and can’t wait
to take a look when I get home. I’m shocked at how fast your blog loaded on my phone ..
I’m not even using WIFI, just 3G .. Anyhow, very good blog!

Anonymous

Will I find the name of the cat’s creator on individual whiskers like on the snake scale in Blade Runner?

Anonymous

This is totally for real, which is why we love Andy, and feel kinda bad for him at the same time.

We also feel bad for Mrs Shen, because this condition is just gonna gets worse as he ages.

Anonymous

photoshop work around his calves and back a little obvious

Darren

Fantastic information. Cheers.
xunjie 首に巻いスカーフを使用していました。
より良いこれらの企業の経験を促進するために、
効果的に共通の運命を持つ企業と従業員の形成を促進、

Anonymous

whats the drag on the cat??? ears up, down, and with a tt helmet

Elvia

Good replies in return of this issue with firm arguments
and explaining everything concerning that.

my blog :: Friendship SMS

Anonymous

Ive met that pervert cat myself too, and assure you it is a creature of very loose morals. Hedonist!

Larae

Nicely put, Many thanks!
xunjie セクシーでエレガント。
我々はすぐに高品質、
周りの人から学んだ。

Anonymous

Can you like create strong winds so you can pin the cat against the wall?That would be cool.

Chantal

Kudos! A good amount of info!

xunjie より広いサービスを提供する:9ネットワークエディタコメント
ダイナミックな輝きを着用してください。
ルーズロングTシャツ ‘女王’のMM薄いシフォンカバーはセクシーな魅力、

Anonymous

You want photoshop skills, here you are:
http://westwoodvelo.com/showthread.php?t=3992

Anonymous

kind of makes sense. it’s like tacking in a sail boat. a solid sail would create more lift for the hull than an open mesh net

Anonymous

The test is totally real. I photoshopped myself in the top photo to make it look fake for 4/1. Don’t have a Hed 3 to test, setup broken down now. I think anything that’ll fly like a frisbee will by definition generate lift. It’s just a matter of how much. Considering that the clincher disk and the tubular disk seem pretty similar in shape but have vastly different amounts of lift, it’s probably pretty hard to come up with a shape as refined as the sub 9’s. So my guess is that the Hed 3 generates some thrust, but probably very little.

Anonymous

if you know the protocol that zipp uses in the wind tunnel then you will know why they say the sub9 disc is the first negative drag disc. any disc will post negative drag when you start with attached airflow – i.e. go from 0 to 15 deg yaw. the thing that the sub9 does that no other disc has is to take detached airflow and post negative drag – i.e. going back from 30 deg to 15.

i was surprised to see that the sub 9 posts lower drag than the regular zipp disc in the tunnel also at 0 deg yaw. we had it set up in a Felt DA and there was a definite difference…

Anonymous

thats a cute cat

Anonymous

Sounds like you’re saying it can generate lift in a stall? I’m guessing it can generate lift beyond 15 degrees, but isn’t it in a stall if the airflow separates?

Anonymous

crosswind? Would drag be induced in a strong tailwind? hmmmmm.

Georgia

My family members always say that I am wasting my
time here at net, however I know I am getting know-how daily by readinjg thes
nice posts.

my web site acne treatment brisbane

Brodie

Great content, Regards.
xunjie このネックレスのために実際に適しているのは二の足を与える必要がありますが、
最も一般的なだけでなく、
それは本当にのマスターミックスである曲線を強調!金パターンの金柄ノースリーブワンピースノースリーブワンピース、 adidas

Anonymous

actual cross tailwinds very rare. winds would have to be so high that a little extra drag would be the least of your problems.

Anonymous

What’s the drag coefficient of the moggie?

Mike

What’s the drag coefficient of the moggie?

Gregory

Really loads of helpful info!
xunjie リラックスしたスタイルの膨張感。
それが自分自身を表現するために、
夏のストリートどのように見えるまだシンプルだがスタイリッシュで、

Andy

actual cross tailwinds very rare. winds would have to be so high that a little extra drag would be the least of your problems.

Lila

J’аi trouvé ton site intesrnet par hasard et ʝe nne le regrette point !!

Heгe Ñ–s my web site … sexe choquant

Gabriel

Very good postings, Many thanks!
xunjie 信頼と支持のビジネスマンの友人の大半広東モニカ会社。
対照的な中間色での支配的な地位を利用、
彼らにとって衣服の面で生活やライフスタイルに向けた、

Skip

crosswind? Would drag be induced in a strong tailwind? hmmmmm.

Willard

Regards! Valuable information.
xunjie 良好な全体的な開発をフルに活用します。
まずメンズウェアショーを開催します
遊びミックスマッチスタイルでメンズドレスの領域であり、

Toni

This is nicely put! !
xunjie みんなの注目を魅了。
ソフトヌードカラーのダークトーンは非常に外の選択肢もある。
一部のエコノミストは、

Andy

Sounds like you’re saying it can generate lift in a stall? I’m guessing it can generate lift beyond 15 degrees, but isn’t it in a stall if the airflow separates?

Shay

Amazing a lot of wonderful data!
xunjie それは非常に可能性が高い唐ライオンがオンラインブランドの暗殺者、
さらには全体の機械的な時計製造のための新しい道を開いたかを理解するためには、
リベットをポップアップ表示されます。 sk-ii

z

thats a cute cat

the real lance

if you know the protocol that zipp uses in the wind tunnel then you will know why they say the sub9 disc is the first negative drag disc. any disc will post negative drag when you start with attached airflow – i.e. go from 0 to 15 deg yaw. the thing that the sub9 does that no other disc has is to take detached airflow and post negative drag – i.e. going back from 30 deg to 15.

i was surprised to see that the sub 9 posts lower drag than the regular zipp disc in the tunnel also at 0 deg yaw. we had it set up in a Felt DA and there was a definite difference…

Anonymous

whats the drag on the cat??? ears up, down, and with a tt helmet

Eve

Everyone loves what you guys are usually up too. This type of
clever work and exposure! Keep up the awesome works guys
I’ve added you guys to my personal blogroll.

Check out my web site … ugg

Laura

Appreciate it, Loads of posts.

xunjie 彼女は彼女の完璧な顔の特徴と顔を合わせて、
これも黒のTシャツネックシルエットのスカートは厳しいエコー、
Xiangde英チャンの色を、

Anonymous

Ive met that pervert cat myself too, and assure you it is a creature of very loose morals. Hedonist!

Calvin Klein Richards

Can you like create strong winds so you can pin the cat against the wall?That would be cool.

Anonymous

You want photoshop skills, here you are:
http://westwoodvelo.com/showthread.php?t=3992

Demetria

Nicely put. Regards!
xunjie 緩やかなスラックスが列よりも細くすることができます。
ローマの靴ホール漫画の要素を持つ白の漫画のプリントTシャツ+ヒョウ靴+白ショッピングバッグ:印刷Tシャツ+青+白パンツローヒールサンダル日焼け防止衣類点を持つデニムショーツ+白のキャンバスシューズ+黄色+黒のショルダーバッグ白い点を持つ+ショルダーバッグ:ポイントで印刷されたレトロな白いTシャツ+ジーンズ鉛筆のズボン+シューズ+ベージュステッチキャンバス野球帽:ブルーショルダーバッグ、
早朝にライトグレーのコート、

Quinton

Ƥleаse let mme know if yoÕ½’re looÆ™img for a author for youur site.
You have some really gooԀ artiϲles and I believe
I would bbe a good asset. If you eѵеr want to take sοme
of the load off, I’d absolutely love tto wrÑ–te some
content for your blog iin еxchange for a link back to mine.
Please send me aan e-mail if interested. Many thanks!

Look Ñ–nto mʏ blog pÖ…st – http://hausfrauen-sex.me/setcard/262335/sexy-lara.html (http://frivyepiben10.com)

Grace

Great data, Cheers!
xunjie 袖口はコラージュ感覚を破るために鈍いコートをロールアウトのように、
彼女は決してチェイスであることを証明してから人気ユーザーを失った。
想像力と話をした女性に、

Anonymous

kind of makes sense. it’s like tacking in a sail boat. a solid sail would create more lift for the hull than an open mesh net