The elliptical for those who want more power and optimized pedaling. This transducer is less oval (only 10%) and does not have as aggressive timing (112') as competing manufacturers. However, it still brings the benefits of elliptical gears in the form of better force distribution during pedalling and reduced torque on the cassette. Thanks to this shape you are carrying as if two converters in one. During the shooting phase, 34z. variant will behave like a standard 36 and during the release phase like a 32z. The size of this converter corresponds to the size of a standard converter + 2 teeth. So check the space around the centre of your frame to see if you have room for the converter. Boost variant with 3mm offset. Designed for Sram cranks with three-bolt mounting. Drop-Stop A is designed for 9,10,11 spd chains of all brands and for 12spd SramEagle, KMC, Connex and Wippermann chains only Weight: 28t - 60g | 32t - 68g | 32t - 74g | 34t - 83g | 36t - g | 38t - 82g | 40t - 88g | 42t - 96g Material: 7075-T6 aluminium Made in USA