42mm Air Filter for 250cc ATVs Quad 4 Wheeler 250 CC 250c Dirt Bikes Pit Bike SSR Roketa Taotao SunL JCL Coolster 42mm Air Filter. Top Quality Guaranteed. 42mm Air Filter; It fits most Chinese 250CC ATVs & Dirt Bikes, Such as Taotao/Coolster ATVs and Enduro/SSR/Coolster Dirt Bikes, check pictures and specifications for compatibility Inside diameter: 42mm Higher air flow than normal filter for maximum power; Race tested for performance and reliability; Race filters increase air flow by up to 25% over standard filters; High quality ensured