Our ultra-light MTB rally - all mountain hub Meticulously honed and improved over the years with an alignment of the lightest 7075T6 aluminum. 4 double sealed bearings with ultra-smooth rotation, Japanese precision. 7075T6 aluminum core and 15mm axle. Classic gear system with 3 oversized pawls. The cassette body can be changed from Shimano to SRAM system without any other modifications or adjustments. Easy maintenance.