The TZ and TX Tourney groupsets also include brake levers, freewheel/cassettes, bottom brackets and cranksets and are all compatible to upgrades up to 1 or 2 components above in the Shimano MTB hierarchy. Not only are they top-of-the-line in terms of price, but they also excel in performance where the other groupsets fall short. They come with a thumb and index shifter levers for up and down shifts. Shimano Dura-Ace (R9170, R9150, R9120, R9100) As the top-tier selection for bike riders, Dura-Ace is the premier option in the hierarchy of Shimano parts. The RapidFire shifters are the most popular in not just Tourney but all other MTB/hybrid gearing components. Grip shifters or Revo shifters as they are popularly known are the first kind of shifters seen on Tourney groupsets, though they are easy to use the maintenance and repairs are complicated. Both the TX and TZ derailleurs can be found working with 2 types of shifters, grip and rapid fire. Minor design adjustments are made in these to improve gear shifting speed. Shimano’s TX series derailleurs are one step above the TZ in terms of build quality. But if you are looking for regular commuting and/or occasional flat trail rides then these components are perfectly suited for such bicycles. These gears when in use doesn’t feel the smoothest and will need tuning from time to time. The TZ series was released first in Tourney and most commonly found as 3x7 Speed combinations. The Shimano Tourney TZ series groupset are found in entry level Hybrids and MTBs.
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