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A groupset or gruppo (from the Italian for "group", sometimes misspelled grouppo) is a bicycle component manufacturer's organized collection of mechanical parts. It generally refers to all of the components that make up a bicycle excluding the bicycle frame , fork , stem, wheels , tires, and rider contact points, such as the saddle and handlebars .
Finally, the entire 7970 groupset weighs approximately 113 grams (4.0 oz) less than the 7800 it replaces but 68 grams (2.4 oz) more than the new 7900. [17] In 2011 Shimano introduced the Ultegra Di2 [18] electronic gear change set, a cheaper version of the electronic Dura-Ace system. This set seemed to provide an electronic option within reach ...
This is done because the chain is shifted across the cassette much more often than the chainrings. This setup might save up to 200 grams (7.1 oz) of the total bike weight. Compared to the minimum legal racing weight permitted by the Union Cycliste Internationale, 6.8 kilograms (15 lb), 200 grams is about 3% of the total weight.
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The difference between the two can be seen by the depth of mounting grooves on the bottom bracket spindle. v1 spline grooves are 5 mm long, while v2 grooves are 9 mm long. Shimano 105, Ultegra 6500 and Dura Ace 7700 cranksets mate to v1 spindles, while later mountain bike designs use the deeper-grooved v2.
A year after the American Academy of Pediatrics flagged what it described as "questionable marketing practices" by makers of formulas for older infants and toddlers, Abbott Laboratories is being ...
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