Brompton folding bikes come in 4 gearing options, including the single speed, 2 speeds, 3 speeds, and 6 speeds. Specifically, the standard single speed has 12T rear sprocket and 54T front chainring; the 2-speed version has 12T/16T rear sprocket and 54T front chainring; the 3-speed version has 13T rear sprocket and 50T front chainring; the 6-speed version has 13T/16T rear sprocket and 50T front chainring.

Apart from the standard versions, the Bromptons are also available in reduced or raised gearing variations. So, you will have more choices to pick your suitable gear inches. You might want to choose a lowered gear to pedal easier or raised gear to go faster. Keep in mind that the gear range on a Brompton will feel a little different as compared to the range of road bikes.

Now, let’s check out the gear inches and meters traveled (the distance the bicycle travels for one crank revolution) of all the Bromptons.

1st 2nd 3rd 4th 5th 6th
6 speed standard 33.1” 2.64m 40.7” 3.25m 51.9” 4.14m 63.8” 5.09m 81.3” 6.49m 100” 7.98m
6 speed -12% 29.1” 2.32m 35.8” 2.86m 45.6” 3.64m 56.2” 4.48m 71.5” 5.71m 88.0” 7.03m
6 speed +8% 35.7” 2.85m 44.0” 3.51m 56.0” 4.47m 68.9” 5.50m 87.8” 7.01m 108.0” 8.62m
3 speed standard 47.9” 3.82m 63.8” 5.09m 84.9” 6.78m
3 speed -12% 42.1” 3.36m 56.2” 4.48m 74.7” 5.96m
3 speed -18% 39.1” 3.12m 52.2” 4.16m 69.4” 5.54m
3 speed +8% 51.7” 4.13m 69.0” 5.50m 91.7” 7.32m
2 speed standard 56.0” 4.47m 74.7” 5.96m
2 speed -7% 51.9” 4.14m 69.2” 5.52m
2 speed -19% 45.7” 3.64m 60.9” 4.86m
1 speed standard 74.7” 5.96m
1 speed -7% 69.2” 5.52m
1 speed -19% 60.9” 4.86m


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  1. Hello. I use my 2 speed Brompton for my daily commute, but find that on medium inclines the low gear is a bit too slow but the top gear is quite hard work. Currently I have a 54t front and 12/16 rear sprocket. If I decide to change the front chainring, what would you recommend – I don’t want to lose too much top speed, but want a bit more speed on the inclines.
    thank you


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