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16 speed Brompton with shimano nexus 8

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16 speed Brompton with shimano nexus 8

Old 11-18-11, 03:01 AM
  #1  
garyliu
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16 speed Brompton with shimano nexus 8

This 16 speed Brompton was from a S1L,single speed.
Crank is a shimano alfine,which is easy for chain line modifying.
Everything is perfect,include the folding...






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Old 11-18-11, 09:17 AM
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16 speeds on a Brompton...are you going to do some heavy touring? It seems too many gears for such a bike otherwise.
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Old 11-18-11, 09:50 AM
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ok... that is making me rethink Bromptons now.
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Old 11-18-11, 10:22 AM
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Originally Posted by garyliu View Post
This 16 speed Brompton was from a S1L,single speed.
Crank is a shimano alfine,which is easy for chain line modifying.
Everything is perfect,include the folding...
Cool stuff.

My question is the gear range. I'd think that a lot of your gears are way too low for anything other than hauling cargo.
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Old 11-18-11, 10:33 AM
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Wow, this looks intriguing. I would also be interested in knowing more about the gear range as well as how you did this. I'd like some nice low gears to help me tackle some very steep grades in my area. I'd been thinking electric mod, but this may be a better route.
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Old 11-18-11, 11:21 AM
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I, too, would like to know more about this, particularly the front derailleur and crankset. Which specific derailleur and crankset did you use, and what chainrings? What shifter did you use, and how is the cable routed to the derailleur? It's difficult to tell from the photos how exposed the front derailleur is when the bike is folded -- is there any chance of it being bashed and knocked out of alignment or damaged?

The front derailleur looks like a way to extend the gear range with a 3-speed hub (the regular 3-speed hub, not the BWR) so that shifting can progress through the three gears on the hub before there's a need to shift the derailleur, rather than the kludgy back-and-forth shifting on the stock 6-speed Bromptons.
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Old 11-18-11, 11:49 AM
  #7  
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Did you do the work?

Did you use a skip hole lacing pattern and a standard 28 spoke rim ,
or get a 32 spoke 349 rim?

How was the hub OLD narrowed, or was the frame spread?

a how to on that FD mount fabrication would be especially helpful..
any images of it off the bike, before being fitted?

I think the question above:
so that shifting can progress through the three gears on the hub before there's a need to shift the derailleur,
could be resolved with a Shlumpf IG crankset, no FD needed
I have their mountain drive a 2.5:1 reduction gear, as if a 50-20t double crank
hub high gear, in low range takes up where low in the hub leaves off,
so there are 6 gears much closer together in the lower range.

but being a planetary.. shift takes place at any time/speed,
beneficial for bogging down on a climb.. double shift to next lower combination.

I've been considering a double chainring on my mountain drive ,
to close up the ratios, a bit, in high range..

Last edited by fietsbob; 11-18-11 at 12:08 PM.
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Old 11-18-11, 05:10 PM
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Originally Posted by garyliu View Post
This 16 speed Brompton was from a S1L,single speed.
Crank is a shimano alfine,which is easy for chain line modifying.
Everything is perfect,include the folding...

hmmm. quite interesting. nice upgrade though may i ask, how's the gearings ?
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Old 11-18-11, 05:14 PM
  #9  
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Originally Posted by fietsbob View Post
could be resolved with a Shlumpf IG crankset, no FD needed
adding schlumpf on your bike is one of the best upgrade you can think of, but this set-up will cost you about $500++.
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Old 11-18-11, 05:41 PM
  #10  
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They are Swiss made .. CHF has been gaining value in comparison
to the troubled U$D, and the Euro, and that does not help the exchange rate.
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Old 11-18-11, 10:43 PM
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Originally Posted by invisiblehand View Post
Cool stuff.

My question is the gear range. I'd think that a lot of your gears are way too low for anything other than hauling cargo.

GI is 22 to 90.

Cog:16T,
Chainwheels:52/39T
Nexus 8 gear ratio:0.53-1.61

Last edited by garyliu; 11-21-11 at 07:23 PM.
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Old 11-19-11, 12:14 PM
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and how is it for weight ? Thing of beauty though...
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Old 11-20-11, 01:39 PM
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Nice fit for the front derailleur, also curious for details on that (is it a stock clamp size?).

Shifting ok (front derailleur) with such short chainline?

Guess the alfine 11 could give you almost same total gear range but a little more expensive, but OLD mod for rear might be weird.
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Old 11-20-11, 03:17 PM
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Fudges custom builds https://www.fudgescyclestore.com/index.php?c=5918
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Old 11-21-11, 12:28 AM
  #15  
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Originally Posted by Micheal Blue View Post
16 speeds on a Brompton...are you going to do some heavy touring? It seems too many gears for such a bike otherwise.

If you are touring with a bicycle trailer,you really need a wide range gears.




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Old 11-21-11, 01:03 AM
  #16  
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Originally Posted by Drdul View Post
I, too, would like to know more about this, particularly the front derailleur and crankset. Which specific derailleur and crankset did you use, and what chainrings? What shifter did you use, and how is the cable routed to the derailleur? It's difficult to tell from the photos how exposed the front derailleur is when the bike is folded -- is there any chance of it being bashed and knocked out of alignment or damaged?

The front derailleur looks like a way to extend the gear range with a 3-speed hub (the regular 3-speed hub, not the BWR) so that shifting can progress through the three gears on the hub before there's a need to shift the derailleur, rather than the kludgy back-and-forth shifting on the stock 6-speed Bromptons.
Front derailleur is Micro-shift RD-R52(R42?),you can use any hanging type front derailleur,as Shimano SORA or 105.

For installing front derailleur,it need a adapter,I chose a "lite pro" adapter,which is a folding bike parts supplier in China,this adapter is for Dahon Speed 8,it only costs about USD20.

Crankset is Shimano Alfine,orginal chainring is 45T,I replaced it with Shimano 105,52/39T.

Shifter is Shimano Alivio M430 left。

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Last edited by garyliu; 11-21-11 at 03:52 AM.
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Old 11-21-11, 01:19 AM
  #17  
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Originally Posted by fietsbob View Post
Did you do the work?

Did you use a skip hole lacing pattern and a standard 28 spoke rim ,
or get a 32 spoke 349 rim?

How was the hub OLD narrowed, or was the frame spread?

a how to on that FD mount fabrication would be especially helpful..
any images of it off the bike, before being fitted?

I think the question above:

could be resolved with a Shlumpf IG crankset, no FD needed
I have their mountain drive a 2.5:1 reduction gear, as if a 50-20t double crank
hub high gear, in low range takes up where low in the hub leaves off,
so there are 6 gears much closer together in the lower range.

but being a planetary.. shift takes place at any time/speed,
beneficial for bogging down on a climb.. double shift to next lower combination.

I've been considering a double chainring on my mountain drive ,
to close up the ratios, a bit, in high range..
Yes, I did all these by myself.

I used the original Brompton 28 spoke rim,Shimano Nexus 8 has a Dahon 28 spoke version,it is a "Red Band" premium model.

Nexus 8 OLD is 132mm,it would reduce 7-8mm by taking off the screw in dust cover(K),and using a car jack to stretch rear fork to 145mm,after removing car jack the fork will remain 125mm.


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Old 11-21-11, 03:52 AM
  #18  
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Originally Posted by jimbeans View Post
Nice fit for the front derailleur, also curious for details on that (is it a stock clamp size?).

Shifting ok (front derailleur) with such short chainline?

Guess the alfine 11 could give you almost same total gear range but a little more expensive, but OLD mod for rear might be weird.
Front derailleur adjusting is very easy,you may doubt the chainline of Brompton is not standard,would it be easy?but don't forget that chain would not move radially in a internal gear system.
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Old 11-21-11, 03:52 AM
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Originally Posted by gringo_gus View Post
and how is it for weight ? Thing of beauty though...
About 12kg
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Old 11-21-11, 08:51 AM
  #20  
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Nice work.

Originally Posted by garyliu View Post
Yes, I did all these by myself.

I used the original Brompton 28 spoke rim,Shimano Nexus 8 has a Dahon 28 spoke version,it is a "Red Band" premium model.

Nexus 8 OLD is 132mm,it would reduce 7-8mm by taking off the screw in dust cover(K),and using a car jack to stretch rear fork to 145mm,after removing car jack the fork will remain 125mm.


When did the Alfine/Nexus 8 get symmetric flanges?
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Old 11-21-11, 10:53 AM
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Hi garyliu, very nice bike and thanks for the info. I contemplating for some time adding to my 6sp S Brompton a second chainring with 'greasy finger' shifting so I can copy that part of your configuration.

Is this the crankset you are using? Does it fit the Brompton frame and pedals with no modification or damage?

https://www.shimano.com/publish/conte...L.-type-..html

https://techdocs.shimano.com/media/te...9830604038.pdf

Anything else I should be aware of before doing this mod?

Thanks,

k.
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Old 11-21-11, 11:49 AM
  #22  
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Hmm, Data sheet says offered cog size.. 16t and larger, having tried a 16t cog
and having it hit the end of the frame tubes.. that the dropout is fitted into
on my Mk3 bike, I reverted to a 15t..

what cog did you use [or did they alter the Mk4 rear section for the 2 speed hub?
a 12/16t combo.
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Old 11-21-11, 07:30 PM
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Originally Posted by kamtsa View Post
Hi garyliu, very nice bike and thanks for the info. I contemplating for some time adding to my 6sp S Brompton a second chainring with 'greasy finger' shifting so I can copy that part of your configuration.

Is this the crankset you are using? Does it fit the Brompton frame and pedals with no modification or damage?

https://www.shimano.com/publish/conte...L.-type-..html

https://techdocs.shimano.com/media/te...9830604038.pdf

Anything else I should be aware of before doing this mod?

Thanks,

k.
Hi K.,

Yes,I am using this Alfine S-500,it is a road/mountain size compatible,and have two spacers for different BB width,so it brings convenient for adjusting chainline.

Gary

Last edited by garyliu; 11-21-11 at 07:54 PM.
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Old 11-21-11, 07:36 PM
  #24  
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Originally Posted by fietsbob View Post
Hmm, Data sheet says offered cog size.. 16t and larger, having tried a 16t cog
and having it hit the end of the frame tubes.. that the dropout is fitted into
on my Mk3 bike, I reverted to a 15t..

what cog did you use [or did they alter the Mk4 rear section for the 2 speed hub?
a 12/16t combo.
I am using 16T cog and it is very close to frame.
Stretching frame may change the geometric dimensioning of rear frame,so I can insert a 16T cog.
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Old 11-21-11, 07:41 PM
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Hi david,

Sorry,I have not enough post(50 post minimum),so I can't reply your message.
My trigger shifter is Alfine 8 sp,it works good.
I am from China,this bag bought in our C2C website:www.taobao.com ,price is about USD3.0(amazing?)

Gary

Last edited by garyliu; 11-21-11 at 07:45 PM.
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