OS-20 (451mm) Alienation Aluminum Double Wall BMX Rim - 36H - Black 6" If you do not know

If you do not know what OS-20 is

125 (ISO 254mm)

The 16" Weinmann 519 rim is a silver anodized aluminum single wall that has 36 holes

50m internal spacer (x1)

This brake comes with Odyssey’s convenient double lugged straddle cable

OS-20 (451mm) Alienation Aluminum Double Wall BMX Rim - 36H - Black 6" If you do not knowThis is an OS20, race intended, double walled and sleeved joint rim. It is 20" (451mm) for OS 20 tires only. This rim only works with OS 20 (451mm) tires, not standard 20" (406mm) tires. If you do not know what OS 20 is, DO NOT BUY THEM. Use: BMX Race Size: 20in ISO: 451mm Wall: Double Drill: 36H Side: Machined Sidewall Material: 6061 T6 Valve: SV Posted Weight: 462g Width ID: 27mm Profile: 19. 75mm Width OD: 34mm ERD: 430 Color: All Black