What chainring does he have? I did it the other way, found the stock gearing to high for me, so swapped out the chainring for a smaller one and shortened the chain. It was pretty straight forward, especially by Brompton standards.
60T here! couldnt get over constantly topping out the 54t, dont get me wrong, my commute is only like 50ft climbing if that and it doesnt go up too many hills!
What chainring does he have? I did it the other way, found the stock gearing to high for me, so swapped out the chainring for a smaller one and shortened the chain. It was pretty straight forward, especially by Brompton standards.