The Reaper 27.5, 2020 Reaper 24, and 2020 Reaper 26 use a 12mm x 173mm with a 1.5mm thread pitch, replacement rear axles can be purchased from our online store or your local Rocky Mountain dealer using the part number: 3227009
The 2019 Reaper 24 and Reaper 26 use a 9mm x 146mm QR.