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Sergeant_Pluck
ibob
sbbohr
according to this Brompton Gear Calculator , the stock 6 speed ratios are 33 - 40 - 51 - 63 - 81 - 99". For example, if you changed for the stock option 44t chainring, it would give you 29 - 35 - 45 - 56 - 71 - 87", so then your cruising gear is a nice-for-round-town 71", you gain a lower granny gear, but you lose your top gear.