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The two speed Brompton uses a 50T chainring in the front and a combination of 12T and 16T cogs in the back. That gives it a gear inches measurement of about 55 gear inches in the low gear and 74 in the high gear. You can reduce this by 12% by switching to a 44T chainring or increase it by 8% by switching to a 54T chainring. With the standard 50T chainring the low gear is good for climbing moderate hills and the high gear is good for cruising or going a bit faster. This Brompton bike is the best option for a lightweight folding bicycle that can still handle some hills.
Technical Two Speed Brompton Video Review
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