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closed wheel in the end is not faster than the ordinary wheel group?with their own drivers or iron three athletes in training (SHAO) practice (CHE) on the road to go farther and farther, the requirements of the equipment has become more and more high. It is well known that in bicycle riding high, more than 80% of the work of driver is used to fight the wind and even make any improvement in the aerodynamic performance can let a person million (Zi) (WO) Xin (Wei) hi (Jie). a pair of good wheel group has always been the importance of the bicycle parts wheel group of every driver's importance is self-evident. So what should we do to evaluate the performance of a pair of wheel groups? The first must be the weight. Currently on the market popular brand integrated wheel weight is basically concentrated in 1000g-1400g (a pair), no one is willing to spend ten thousand yuan to change a pair of 1800g wheel group to participate in the game. Followed by rigidity. Slow speed, shake rub the car brake wheels have been spurned by the people is, fortunately, after several rounds of R & D, improving, at present all brand wheel group of rigid is remarkable. Again is the aerodynamic performance. P cheap foamposites for sale utting it in the last place is not saying it is not important, because it is a topic that we should focus on today. Especially in the iron man three competitions and bicycle individual time trial, no group of breaking wind. When you go alone against the oncoming wind, a pair of aerodynamic performance excellent wheel group can add to your confidence, and in the ideal state, in each one kilometer can you win a few seconds of time advantage from the opponent's body. mentioned here refers to the "ideal state" is a calm, flat road. In this theoretical situation, wheel of the wheel frame is higher, the lower the resistance, the faster the speed of nature. Under the impetus of this principle, the closed round came into being. No closed design the spokes of the bicycle tail can integrate the airflow, thereby reducing drag. Its popularity thanks to the early 1980s driver Moser Francesco using a closed wheel before and after breaking the world record for the 1 hour cycle. In the early stage, iron three athletes are also beneficiaries of the closed round, but the use of the degree is far less than those in the extreme pursuit of aerodynamic performance of the timing of the players in th jordans on sale online e popularity of. then the closed wheel in the end is not faster than the ordinary wheel group? How much faster? I know you won't believe the data without the data. Xiaobian site in the wheelbuilder find the enclosed wheel and wheel group compared with the pneumatic test data, here to share with you. From the figure draw the conclusion: at high speed, closed wheel from different wind attack angle on aerodynamic performance are than aluminum wheel or wheel frame group more excellent, drag is smaller, faster. but in the actual game, the closed round really worth to use it? I think it can be based on the track conditions combined with the following aspects to make judgments: 1, track fluctuation degree seal 〉related information:Since 2011, the EU non food consumer rapid warning system (RAPEX) launched hundreds of briefing on Chinese children's goods. 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The reasons include chemical risk, suffocation risk, structural design safety, microbiological risk and flammability, among which three problems have become chronic diseases. The first is the chemical risk, involving a total of 168 bulletin, the adjacent benzene two formic acid ester content exceed the standard accounted for 81.5% into the first "cancer", involving up to 137 followed by the Bulletin; small parts off caused by the risk of suffocation, such as decorative pieces of shoes on the loose, involving a total of 110 children and pass; clothing rope safety problem Cheap air jordans for sale , involving up to 96. according to media reports, this year, the EU has successively issued a number of high risk factors in safety assessment report, such as children's toys at the beginning of bisphenol A in security risk assessment report, suggesting that this matter has influence on children's endocrine activities, the European Commission with the revised children's toys directive will limit the migration of bisphenol A 0.1 mg / L, after the limited only by the European toy industry voluntary, not mandatory; in August, the European Commission of health and environmental risk assessment center (SCHER) released a report that six chromium has potential carcinogenicity, and suggested that significantly enhance the six chromium migration toy safety directive in the limited requirements. recently, the U.S. Congress put forward a new proposal (S.2811) "and" 2014 child protection act to limit the use of firefighters, three antimony oxide, in children's products or upholstered furniture in ten, three polybrominated diphenyl ether phosphate, phosphoric acid ester three, four tetrabromobisphenol A and six ring twelve alkyl bromide and 10 kinds of flame retardant chlorinat jordan retro 14 white/fuchsia blast/black ed paraffin. In the future, children's goods export quality requirements will be more stringent." Wang, head of a children's goods export company in Ningbo, said. it is understood that the new proposal to the U.S. Congress recently (S.2811) "the provisions of the 2014 children and firefighters Protection Act" requirements more stringent limit children's products or upholstered furniture (diaper pad, portable baby)Kevin Durant has always been a colorful design, but the new Zoom KD 9 Cargo Green is a little more sedate. 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