5DEV 8-Bolt BMX Spider BCD Race Crank Our 104BCD BMX Spider is compatible with our RGXC Titanium BMX Crank, as well as our Zink and our Titanium MTB Crank. These are all SRAM 8-bolt interface design, and all of them are compatible for BMX. Our Spider adopts the use of leading BMX chainring makers such as Tangent Products, Rennen Design Group, and others that use the 104BCD standard. CNC machined from 7075 aluminum in San Diego, it keeps the weight honest and the construction in line with every other part in the 5Dev line up. Features7075 aluminum construction CNC machined from billet for strength without excess weight104 BCD interface opens up compatibility with leading BMX chainring brands including Tangent Products and Rennen Design Group SRAM 8-bolt crank compatibility fits RGXC Titanium BMX, Cam Zink Signature, and Titanium MTB cranks Made in San Diego, California machined in-house at 5Dev using the same equipment as their aerospace and medical work | 5Dev | 8-Bolt Bmx Spider | Black | 104 Bcd | Aluminum