Derailleur gears a detent or ratchet mechanism which stops the gear lever, and hence the cable and the derailleur, after moving a specific distance with each press or pull. Indexed shifters require re-calibration when cables stretch and parts get damaged or swapped. On racing bicycles, 10-gear rear cassettes appeared in 2000, and 11-gear cassettes appeared in 2009. Most current mountain bicycles have either. Many modern, high-end mountain bikes have begun using entirely one chain ring drivetrains, with the industry constantly pushing the number of rear cogs up and up, as shown by SRAM's Eagle groupsets (1 by 12) and Rotor's recent 1
Word sort be introduced at a very early stage and develop with a child’s individual ability. Sorting pictures or oral vocabulary is a manipulation of sounds, and this manipulation increases awareness. A simple introductory sort is by initial sound and this can develop to ending sound, vowel sounds, and word families sorts. The root of importance is student motivation and involvement in the sort. By “setting the scene with sounds," sorts may include concrete materials and pictures linked to learner interest. Phonemic awareness, not phonics, is the understanding that our spoken sounds work together to make words. This is a very early