Shimano Tourney RD-TY21 rear derailleur with short cage for 6-speed and 7-speed derailleur gears

The Tourney TY21 rear derailleur is particularly popular for folding bikes as well as mountain bikes and trekking bikes. It is mounted directly in the thread of the dropout and can be used universally for 6-speed gears as well as 7-speed gears.

With a total capacity of 28 teeth, most common gear ratios can be used. The total capacity reflects the difference between the smallest and largest sprockets on the cassette (rear) and the smallest and largest sprockets at the front of the crank. For example, if your cassette has a gear ratio of 14-28 teeth, the difference is 14. This means that a crank with a maximum difference of 14 teeth between the smallest and largest sprocket could still be used at the front.

Model features:

• Manufacturer: Shimano
• Model: RD-TY21
• Model series: Tourney
• Length of shift cage: short (SS)
• Maximum capacity at the front: 13 teeth (=difference between large and small chainring on the crank)
• Total capacity: 28 teeth
• Largest sprocket on cassette: 28 teeth
• Smallest sprocket on cassette: 14 teeth
• Material: steel, resin plastic
• Color: Black
• Weight. approx. 250 grams (weighed yourself)

The Tourney TY21 rear derailleur is particularly popular for folding bikes as well as mountain bikes and trekking bikes. It is mounted directly in the thread of the dropout and can be used universally for 6-speed gears as well as 7-speed gears. With a total capacity of 28 teeth, most common gear ratios can be used. The total capacity reflects the difference between the smallest and largest sprockets on the cassette (rear) and the smallest and largest sprockets at the front of the crank. For example, if your cassette has a gear ratio of 14-28 teeth, the difference is 14. This means that a crank with a maximum difference of 14 teeth between the smallest and largest sprocket could still be used at the front. Maximum capacity at the front: 13 teeth (=difference between large and small chainrin