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Old 05-03-14, 10:52 AM   #1
shinew
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Swap to 54T chainring on standard 2013 Brompton M3L?

I have been riding my 2013 Brompton M3L for awhile now and feel that I would prefer an overall higher gearing for it. I've never changed a chainring on a bike before so is there anything I need to know before proceeding?
For instance is any standard 54T chainring would do(something like this or I need "Brompton specific" one?

Thanks!
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Old 05-03-14, 12:08 PM   #2
fietsbob 
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theirs is including the fitting of the plastic trouser guard , its 130 BCD . but if you dont get your pants greasy or snagged in the chain, trouser clips etc.

that Vuelta as a single speed Chaining is reversible, should work.. though only lets the chainring-bolt's sleeve-nut settle in with one side up.

I have a Vuelta 53t as part of my Bike Friday original build ..




I assume you already use the 13 t cog on the hub .

need 5mm allen , a special wrench to engage the slots in the sleeve nut and since you are making the diameter bigger
the chain has to wrap around, probably a new chain

made to be the longer length, by you shortening it from as it comes out of the packaging.. so need a chain tool to do that.

1/8" chain , though there is a Sachs-Brompton 3/32" thick cog .. to use "5~8 speed derailleur chains" on the 3 spline drivers ..

Last edited by fietsbob; 05-03-14 at 12:16 PM.
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Old 05-03-14, 08:22 PM   #3
shinew
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wow, thanks! this is a lot more complicated than I anticipated, didn't know that I would need a new chain...
I'll probably let the bike shop get it done then when my chain gets a bit more used.
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Old 05-10-14, 11:28 AM   #4
shinew
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Just did the chainring swap from standard 50T to 54T at NYCeWheels, and I'm glad I went there instead of doing it myself. They used Brompton replacement 54T chainring so it comes with the chainring guard, added few chain link(I think just 2,don't need a new chain) and it's good to go in 20min for a very reasonable fee. The gearing now is much more to my liking
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Old 05-12-14, 11:24 AM   #5
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How much did they charge you, if you don't mind my asking?
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