Mechanical Belt Tensioner, BMW - I12 i8 Coupe & I15 i8 Roadster

This part is listed by BMW as BMW part number 11287634197 (11-28-7-634-197) and is described as Genuine BMW Mechanical Belt Tensioner for Serpentine Belt on I12 i8 Coupe and I15 i8 Roadster (2015-2021).

This is a Genuine BMW drive belt with a two year warranty. Buying a Genuine part will usually be more expensive than an OEM or aftermarket brand but you are assured that it meets BMW's designs for fitment, performance, and longevity. It will also be the very latest design, incorporating any updates or revisions that an aftermarket brand typically will ignore.