This Litens belt tensioner is supplied by the original equipment (O.E.) tensioner supplier and meets all form, fit, and performance characteristics of the original equipment part . As with the original equipment part, this replacement tensioner is manufactured in Europe and meets all performance and life specifications of the O.E. part. This part was designed for the 2011-2015 BMW 135I, 135IS, 335I, and X1. The part features a premium chrome-silicon steel spring, internal damping, 2 pulleys with a 6203 ball bearing molded to exacting specifications, and pull pin feature for ease of installation. Litens is the world's largest supplier of original equipment (O.E.) power transmission products. At Litens, we design systems that are more efficient, resulting in tangible fuel economy/emissions benefits. Litens holds over 2000 patents and continues to respond to the ever-changing automotive industry by investing heavily in new technology, facilities, and people. 90% of our line is made of products coming from the OE manufacturer, which makes the Litens Tensioning Products portfolio the purest OE tensioning line in the North American aftermarket._

Product Features:

• Designed and engineered by the Original Equipment supplier of this application
• Internal "round spring" technology to provide constant belt tension and alignment throughout its service life. The internal damping design provides quiet, smooth, system performance.
• 2 plastic pulleys specifically molded with tight radial run out for reduced noise and longer life. Pulley specs: 70mm (OD) x 17mm (ID) x 30mm (Width)
• Bolt Included.
• Due to the fact that belts and tensioners have similar Original Equipment "design life targets", it is often a best practice to replace the belt tensioner when replacing a worn or broken belt.
• Belt removal is required to change the tensioner. Therefore, doing both together will extend accessory drive life and lower overall labor versus performing these services separately.
• Installation instructions included.