Bike Forums - View Single Post - Time to replace Brompton?

07-13-12 | 10:10 PM

#8

kamtsa

Senior Member

Joined: Dec 2008

Posts: 1,821

Likes: 1

I think need to pay attention more to the gear range (min/max GI, see http://sheldonbrown.com/gears/ ) rather than the number of gears. A 2x10 gear bike that does not get low enough will not help you with steep hills.

The low gearing 6sp Brompton has a hi/low ratio of 300% that with 44T chainring gives 30-90 GI. You can compute what is the GI for each combination of your current bike and determine what gear range you need. The Tern verge X20 spec is 28 - 93 GI which is about the same as a low gearing 6sp Brompton.

Some products that have large high/low ratio are SRAM Dual Drive and Rohloff but they add to the weight.

And, if you will find the perfect folder, I will also get one ;-)

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