ABSTRACT. Off-road tyre evaluation lacks standardized reference tyres and unified testing procedures, limiting the ability of researchers and industry to compare results across studies. The goal of this study is to identify and thoroughly characterize two tyres with the potential to become reference Standard Off-Road Test Tyres (SORTT), to obtain data for all-terrain passenger vehicle tyres and for agricultural vehicle tyres. The study will establish testing procedures for low- and high-speed off-road conditions. Similar to the role played by the Standard Reference Test Tyre (SRTT) in regulated on-road testing, these reference tyres and associated procedures will provide consistent performance baselines for traction assessment on unpaved surfaces. For each reference tyre, a comprehensive dataset will be developed, including tyre material properties (e.g., rubber Shore hardness and sidewall stiffness), and static test data, such as tyre stiffness on rigid surfaces, as well as normal stress distribution within the contact patch. Low-speed tests will include rolling resistance, wheel hub forces, rut formation, and contact patch stress distribution. The proposed study will provide detailed performance datasets for both selected (potentially reference) tyres as well as standardized testing methodologies suitable for future adoption within the off-road vehicle community and potential incorporation into industry standards. This work aims to improve overall repeatability and support the long-term development of standardized off-road tyre testing practices and to provide the off-road mobility community with reliable sets of data to use for model parameterization or validation. The project, which is supported by an ISTVS small grant, started officially in March 2026.