Take advantage of Brompton's innovative folding feature with the Advance Rear Frame Locking Block. This is a replacement locking block for P and T Line Brompton bikes, to increase rigidity and improve the bike's handling.

This Rear Frame Locking Block will hold your Brompton in place when folded to prevent it from unfolding unnecessarily when you're transporting, carrying, or storing it. Lift your Brompton easily when getting on trains, buses, and into a car while the block keeps it tucked away in its compact folded position.

The locking block comes complete with a stainless steel bolt (instead of plastic), making it strong and durable. It is easy to install and adjust using a 4mm hex key.