Chang Yun India Limited manufactures Single Cone Synchroniser Ring. Chang Yun India Limited is an ISO/TS 16949: 2002 certified company offering a wide range of Synchroniser rings for the automotive industry. The Single Cone Synchroniser Ring synchronizes drive gears and shafts in manual gearboxes, to ensure that equal evolutional speed between the shaft and the gear is reached while shifting. The Single Cone Synchroniser Ring is available with an overall diameter size ranging up to 100 mm.