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ISO 5775 is an international standard for labeling the size of bicycle tires and rims.The system used was originally developed by the European Tyre and Rim Technical Organisation (ETRTO).
For example, if a fat-bike tire is inflated to 0.5 bar (50 kPa; 7.3 psi) gauge pressure at room temperature 20 °C (68 °F) and then the temperature is decreased to −10 °C (14 °F) (a 9% decrease in absolute temperature), the absolute pressure of 1.5 bar (150 kPa; 22 psi) will be decreased by 9% to 1.35 bar (135 kPa; 19.6 psi), which ...
The industrial synthesis of 4,4′-biphenol was developed by Allan Hay in the 1960s. [2] [3] As the direct oxidative coupling of phenol gives a mixture of isomers, [4] [5] 4,4′-biphenol is instead prepared from 2,6-di-tert-butylphenol, where para-coupling is the only possibility. [3]
A 700c "standard" wheel has a 622 mm rim diameter. The final wheel diameter depends on the specific tire but will be approximately 622 mm plus twice the tire width. Front/rear measurement only considers the sizes of a chainring and a rear sprocket. Gear inches and metres of development also take the size of the rear wheel into account.
4,4’-Difluorobenzophenone is an organic compound with the formula of (FC 6 H 4) 2 CO. This colorless solid is commonly used as a precursor to PEEK, or polyetherether ketone, a so-called high performance polymer. Because PEEK is resistant to attack, it is commonly used in carbon fiber coatings and cable insulation.
The 1991 ZX-7R is the first year of the super bike homologation version of the ZX-7. Many changes were made in order to improve performance and usability on the track. The engine is unrestricted and equipped with 39mm Kehin flat slide carburetors, more aggressive camshafts, a higher 11.5:1 compression ratio and a close ratio transmission.
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