Cook Bros Bullseye Style Bottom Bracket Lock Ring Collar | 5/8" ID | BMX Cruiser MTB

Old school BMX or cruiser build in progress?

This bottom bracket lock ring collar is just the ticket.

It's designed to fit spindles with a 5/8-inch outer diameter—super common on classic setups.

It's made from aluminum with a silver finish, and it comes with set screws to lock it in place tight.

This unbranded collar has that Cook Bros / Bullseye vibe, perfect for vintage BMX bikes, cruisers, or even some mountain bikes.

Made in the USA, it's a solid piece of kit.

Clean up your bottom bracket area with this simple, functional lock collar.