Twin Air Standard Air Filter — Beta RR 125 2T (2013-2018), Beta RR 250 2T

Twin Air's Standard Air Filter is the dual-stage foam filter that's been the benchmark in dirt-bike air filtration for decades. Two fused layers of open-pore foam — coarse outer, fine inner — trap airborne dust, grime, and sand while keeping airflow high. Assembled by hand and inspected for fit, with model-specific molds for 1500+ motorcycles dating back to 1965.

• Dual-stage open-cell foam — outer catches grit, inner traps fine particles
• Hand-assembled and inspected, with a greaseless sealing ring
• Washable and reusable — 30+ cleaning cycles is typical
• Model-specific fit — no universal sizes
• Drops into the OEM airbox

Fitment: bike-specific air-box fit. Drops into the OEM air-box on:

• Beta RR 125 2T (2013-2018)
• Beta RR 250 2T (2013-2019)
• Beta RR 300 2T (2013-2019)
• Beta RR 350 4T (2013-2019)
• Beta RR 390 4T (2013-2019)
• Beta RR 400 4T (2013-2019)
• Beta RR 430 4T (2015-2019)
• Beta RR 450 4T (2013-2019)
• Beta RR 480 4T (2015-2019)
• Beta RR 498 4T (2013-2019)
• Beta RR 525 4T (2013-2019)
• Beta RS 390 4T (2015-2019)
• Beta RS 430 4T (2015-2019)
• Beta RS 490 4T (2015-2019)
• Beta RS 500 4T (2015-2019)
• Beta X-Trainer 250 (2018-2022)
• Beta X-Trainer 300 (2018-2022)