Specific models of the RockShox Reba can be upgraded to a Charger 2.1 or a Charger Race Day 2 damper. These dampers will work for either the 80mm, 90mm, 100mm chassis or the 120mm chassis in the 27.5” and 29” wheel Reba. Charger 2.1 and Charger Race Day 2 dampers are incompatible with 26" wheel Reba.
Several variations of the Reba equipped on specific Trek and Specialized frames sold from 2018-2023 will not be compatible with the Charger 2.1 or Charger Race Day 2 damper. This includes, but is not limited to, the Trek Supercaliber and the Specialized Epic Evo. These particular forks have different upper tube lengths, resulting in shortened travel if one of these dampers is installed.
Please reach out to RockShox Rider Support for any upgrade and spare parts questions for your Reba-equipped Trek or Specialized bike.