Shimano Ultegra is a decent line of road bike parts, including things like derailleurs, brakes, hubs, etc. Another example would be Dura-Ace.
You have 2 derailleurs on most road and mountain bikes, one by the rear cog set (gears) and one over the front set. They are the things that move your chain to the appropriate place when you change gears. If you have trouble finding them follow the cable from your shifter to each derailleur. The only other cables on the bike go to the brakes.



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