- Provides additional support and length.
- Provides additional hip support via wider cushion design.
- Integrated rear storage.
- Battery cover with support (860201720) required for REV Gen4 (Narrow) without battery.
- Battery cover (511001210) required for REV Gen4 (Narrow) with battery.
- 2 Summit seat posts (510006693) required for installation on REV Gen4 (Narrow) Summit.