For both 2021 and 2022 spec BTCC cars (all 4 available through DLC), it is possible to mix tyre compounds on a per axle basis. This is however against the regulations of BTCC. 1.14.1.d.i, paragraph 6 https://www.btcc.net/wp-content/uploads/2021/01/2021-BTCC-Regulations_V2_Website.pdf 1.14.1.d.i, paragraph 2 https://www.btcc.net/wp-content/uploads/2021/01/2021-BTCC-Regulations_V2_Website.pdf Also, the 2022 spec cars do not have compound A (Soft) available at any point during the season, and I think this should be reflected in the rF2 2022 car upgrade.
