Brompton 3 Speed 6 Speed Internal Gear Hub Rear Wheel Titanium Nuts  A C line d

This is a set of titanium nuts designed for the rear wheel axle on Brompton folding bikes fitted with 3-speed or 6-speed internal hub gears. The nuts mount on the outside of the frame dropouts, holding the rear wheel securely in place. They're machined from Ti-6AL-4V titanium alloy using CNC production, which gives them a high strength-to-weight ratio that's useful if you're trying to trim grams from your bike.

The set consists of two nuts and saves 5.9 grammes compared to the original Brompton steel component. The titanium version weighs 7.7g against the stock 13.6g, which might seem marginal on its own, but it's the kind of weight saving that adds up when you're swapping multiple components on a folding bike. For riders who commute regularly or frequently move their Brompton between transport and riding, every bit of lightness helps, especially when it comes to carrying the bike up stairs or into an office.

Installation is straightforward—they simply replace the standard nuts on your rear axle, and the machining ensures a clean fit on both 3-speed and 6-speed Sturmey Archer hub gears. If you're already running titanium upgrades elsewhere on your bike, these match that aesthetic and weight-saving philosophy. The durability of titanium means they'll resist corrosion and wear, which makes sense for a component that gets exposed to weather and the general wear of regular folding and unfolding.