Oldenburg is set to make his full-time 450SX debut onboard the factory 450 RX following an extended stint at MotoConcepts Racing Honda, also due to contest three rounds of Pro Motocross and the SMX Finals series.

“I’m super-excited to be working with Beta USA for 2025 and being able to race all 17 rounds of Supercross this season,” Oldenburg said. “With this being my first full season in the 450 class, I’m looking forward to growing with the team and getting better each weekend.”

Beta team manager Carlen Gardner added: “Beta USA is super-happy to be working with Mitchell for the 2025 season. Mitchell brings great experience to the team and we look forward to him showing up to Anaheim 1 on his Beta 450 RX.”

Oldenburg finished fourth in 250SX East two years ago and was fifth in 250SX West during the 2023 season, but only contested a partial season this year. He claimed a best 450SX result of ninth at the Salt Lake City finale.