01 — Section
In-depth guides
In this section you’ll find maintenance guides, hacks and tips — everything I’ve been learning along the way. I’ll explain how each thing is done in detail, for my future self and for anyone who might need it.
Independent record · Folding Gravel ─── Doc. FG-001 · Rev. 2026-05 EN / ES / CA
The independent G-Line record
Everything about the Brompton G-Line
The G-Line is Brompton’s all-road folder: 20-inch wheels, wide tyres, hydraulic discs — and it still folds like a Brompton. I ride one, with a C-Line parked next to it for comparison, and this site is the record I keep: setup guides, specs checked figure by figure, and accessory tests done on my own bike.
Wheel
20″ / 406
Class
All-road
Fold
Yes
Record
FG-001
02 — Section
Full specifications
Geometry, weight, drivetrain, tyres. I check each figure one by one, and where I haven’t confirmed one against Brompton yet, it carries a note until I can verify it.
03 — Section
Accessory comparisons
What actually fits the G-Line: bags, racks, lights and upgrades. I explain what I run, what I returned and why, as a reference before you buy.
04 — Section
Interactive tools
Compare any two Bromptons by gearing, wheel size, tyre width and cadence, with an animation that shows which one rolls further on the same pedal stroke.