Some information about the T-line crankset that many owners want to modify to put a bigger chainring to have longer gear inches.

Brompton choose a specific non standard chainring mounting, the FSA direct mount (which is different from other manufacturers direct mount chainrings) and for which FSA only has either double chainrings for road bikes or single narrow-wide for MTB much too mall for the T-line.

So, its very difficult to find other sizes of chainrings > 50t for the T-line crankset.

Ti Parts Workshop has just made a spider for the T-line that convert the FSA direct mount into a standard BCD 130. Its tthat or replace the whole crankset (and maybe bearings because the crankset axle diameter is 30mm).