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Brompton Mods

Old 03-20-10, 07:56 PM
  #1  
Joako
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Brompton Mods

First one was a new S1L that I converted into an 8 speed:

Description of some of the mods:

- 355 rims and Kojak tires
- Sturmey Archer 8 speed hub
- Front sealed hub with quick release
- Rollerblade wheels
- Raceface Cadence crankset
- Ergon grips
- Birdy extra hard elastomer
- Easton EC90 carbon handlebar
- Tektro caliper brakes with quick release


The second one was a used Brompton M6L that I got off CL. I included the before and after pictures.

Description of some of the mods:

- 355 rims and Kojak tires
- Front sealed hub with quick release
- Rollerblade wheels
- Antique Pink powdercoat
- Shimano 105 crankset
- Shimano Nexus 7 Speed hub
- Birdy hard elastomer
- Aluminum seatpost with microadjust
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Old 03-20-10, 08:40 PM
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DFTR
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Thanks for sharing!
What was the reason behind using 355 rims as opposed to the usual 349s?
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Old 03-20-10, 11:10 PM
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foldie
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how did you fit the shimano octalink bottom bracket onto the brompton..?care to share what mods did you do..?thanks in advance..
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Old 03-21-10, 10:51 AM
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Joako
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Originally Posted by DFTR View Post
Thanks for sharing!
What was the reason behind using 355 rims as opposed to the usual 349s?
Multiple. For example, I wanted to be able to use non Brompton caliper brakes, 36H and 24H drilling, and I got 3 pairs of 355 rims for the price of 1 1/2 349 velocity aeroheat rims.


Originally Posted by foldie View Post
how did you fit the shimano octalink bottom bracket onto the brompton..?care to share what mods did you do..?thanks in advance..
Just took out the old bottom bracket and installed the new octalink bottom bracket. I also had to add some spacers on the drive side in order to fold the bike without scraping the paint. I added a description of some of the mods I did, not sure what are you asking???
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Old 03-21-10, 01:56 PM
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Nice stuff Joako.
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Old 03-21-10, 08:12 PM
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I thought that there were issues with the SA 8 hub on the Brompton. Did you run into any? Or was it straight forward?

How did you get the Shimano Nexus 7 spacing down to ... 115mm? (can't remember the OLD)
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Old 03-22-10, 08:12 AM
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Originally Posted by invisiblehand View Post
I thought that there were issues with the SA 8 hub on the Brompton. Did you run into any? Or was it straight forward?

How did you get the Shimano Nexus 7 spacing down to ... 115mm? (can't remember the OLD)
Yes, there were some issues. For example, getting a 19T sprocket, as they seem to be extinct, also I had to modify the chain tensioner as the sprocket was too big and the chainline was bad to the point that it made the chain come off. Apart from these, everything was straight forward.

I think the original OLD is ~130mm. I was not able to space it down to 115mm, but to about 118mm. In order to do this, I had to take out a few nuts. Also, for the installation, I had to cold set the rear triangle, which was pretty easy as I got a jig that moves both ends at the same time. In general, it was easier to install the Nexus 7 than the Sturmey 8, maybe because I installed the Nexus after playing around with the Sturmey.

Last edited by Joako; 03-22-10 at 08:25 AM.
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Old 07-06-11, 06:52 PM
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this looks awesome!
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Old 09-09-11, 06:55 PM
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Hey I really like that black Brompton modified build you did. A few questions because I'm trying to do a similar build:
1 - why did you opt for the 19T cog? I think that dude in the UK at Kinetics builds them up with 20T cogs - is there a benefit to the 19T cog??
2 - where did you have the back wheel built up for you? Anything tricky about building such a small wheel with such a big hub and was there any trick to the dishing?
3 - does the adjustment knob on the front brake bump the bar when you fold it and prevent the stem from locking down when folded?
4 - did I see you selling this bike recently on Craigslist in NYC? There were pix of a similar bike though I think it was an M-type.
Finally, long shot, but I have a similar Brompton but mine has the M stem and I am trying to find an S stem to swap it out. Any chance you have an extra S stem?
Thanks.
EB
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Old 09-15-11, 11:56 AM
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1. 19T was the smallest one SA had. I don't think they longer make the 19T. Therefore, I believe that is why Kinetics uses the 20T one as that is the smallest one available.
2. I built the wheels myself. I have never built a wheel bigger then 406, so it wasn't that different. No trick to dishing, just calculate the correct spoke lengths after respacing the hub and use a truing stand (I used a park tool professional without any issues).
3. It did, but it was quickly solved by removing a rubber ring.
4. No, that was not me. I have no spare stems.

Hopes these helps.

Originally Posted by Egonblue View Post
Hey I really like that black Brompton modified build you did. A few questions because I'm trying to do a similar build:
1 - why did you opt for the 19T cog? I think that dude in the UK at Kinetics builds them up with 20T cogs - is there a benefit to the 19T cog??
2 - where did you have the back wheel built up for you? Anything tricky about building such a small wheel with such a big hub and was there any trick to the dishing?
3 - does the adjustment knob on the front brake bump the bar when you fold it and prevent the stem from locking down when folded?
4 - did I see you selling this bike recently on Craigslist in NYC? There were pix of a similar bike though I think it was an M-type.
Finally, long shot, but I have a similar Brompton but mine has the M stem and I am trying to find an S stem to swap it out. Any chance you have an extra S stem?
Thanks.
EB
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Old 03-12-12, 04:22 AM
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Is Jako still on this forum? I`d really like to know how that Brompton with a Nexus7 installed is doing! Is the fold compromised from spreading the rear triangle?
What changes was done to chaintensioner?
What size sprocket was used?
Blue/Green antirotation washer?
Any mayor changes I did not think of?
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