Alienation TCS Mischief Rim The TCS (Tubeless Compatible System) Mischief uses our new 4D drilling process less chamfering of which; creates the optimal interface between spoke and rim. This exact angle reduces binding and the need for eyelets. The Mischief Rim uses Alienation''s G69 material, which is super light with superior strength. These rims are designed and drilled for 3 cross specifically, so are not designed for radial lacing. - Use: Race Front Only! - Material: 6069 T6 (30% stronger than 6061 T6) - Walls: Double - Joint: Sleeved - Weight: 290 g - Diameter: 406 (20) - Drilling: 36H - Valve: TCS & SV - Sidewall: N/A - ERD: 386 Colours: Black This is a light weight front rim designed for BMX racing only.