These Brompton-compatible rear triangles were designed for my Rohloff Brompton kits, but are suitable for fitting most standard rear hubs to a Brompton. The design has been refined over 10 years of making hundreds of Rohloff Bromptons.
Made entirely from 304 marine-grade stainless steel, they won’t rust – you can have one in brushed stainless steel finish, or powdercoated to match the rest of your bike. They have a lifetime warranty, like everything I make.
The rear frame has a 135mm OLN width (the Brompton normally is 115mm) so will work with most standard hubs like the Rohloff and Alfine. It has IS disc brake mounts and has enough space for a 160mm rotor They work with normal Brompton frame rollers and Eazy wheels, brakes, and the standard elastomer. Standard mudguards and rear rack will also fit, and if you use a Rohloff it also uses the standard Brompton single-speed tensioner
I also make Brompton-compatible forks – designed for my disc brake kits, these are suitable for fitting standard 100mm-wide front hubs into the Brompton – not just disc brakes but electric motors and standard-width hub dynamos will fit.
They are made from Columbus Zona tubing with investment-cast crowns and fork ends, and come with the correct fittings for the Brompton mudguard and handlebar catch.
Brompton-compatible forks – £295
NEW: 20″ Frames and Forks: I’m now making these for larger wheels – they will fit 18″ x 2″ fat tyres (Birdy size), or 20″ x 1.3″ slick tyres – see the wheel size page for more info. Pricing is the same as for the standard rear triangles, just say you want 20″ parts instead of 16″ when you order. The standard Brompton rack and mudguards still fit these parts (with a little tweaking).
MTBrompton Frames and Forks: These parts will take up to 20 x 2.4″ tyres, as on the MTBrompton bikes I’ve built.