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Old 07-08-12, 07:00 PM   #1
badmother
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Brompton luggage system used on other small wheel bikes. DIY.




http://www.flickr.com/photos/7783618...7630486971388/

Some time back I decided to use the Brompton luggagesystem on all my (our) small wheeled bikes. So far two is back from the welder.

Started with my sons 20" detatchable travelbike and my similar project bike (plan is to make a 20" dogbike).

First I made several exact copys of the small metal piece with two holes that is welded to the Bromptons headtube. Drilled the holes with small, medium and finally 4mm drillbit.

Marked the exact center of the bikes headtubes and drilled two holes in it, matching the holes in the metalpiece I wanted to add.

Using two small (40mm?) pieces of 4mm threaded rod and four nuts to hold them in place I bolted the small metal piece to the headtube.

Off to the welder.

After welding remowed the rods and nuts and drilled the holes all the way trough to 4,2mm.

Then I threaded the holes to 5mm, cleaned up the welds, painted the area and installed the Brompton luggageblock I bought for it.

Asembeled the bike, added a luggageframe and just for the testride added a regular basket.

There is plenty room for a rack to carry two paniers in the front. My plan is to reinstall the Dahon frontrack on the bike, this is why i built a new hub brake frontwheel for it.

Installing a lugageblock tomorrow on my similar longtail project.

BF is stuck in his atempt to do the same becouse of a stuck stem..

After the summerwacation I plan to install the system on at least three other smallwheel bikes. I`ll post pictures as soon as there is progress.

More DIY bags for the lugageframe is in progres. Pix later.
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File Type: jpg DIY luggageblock.jpg (100.2 KB, 116 views)

Last edited by badmother; 07-09-12 at 03:06 PM.
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Old 07-09-12, 01:40 PM   #2
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Slick mod!
Badmother, while you certainly have a knack for cool ideas, and your ingenuity in carrying them out is even more impressive. Okay, I`ll stop before I embarrass you . Anyway, I love front platforms, and the backstops make platfroms even more useful. Great plan bolting the blocks on to be welded offsite. Good luck with getting the rest of your bikes in compliance with the new standard.
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Old 07-09-12, 01:59 PM   #3
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Wanted BiFri to weld the copy of Brompton mounting block on (which is what was done here],.. when I was asking about ordering the bike.

since the single big bag is more handy-useful off the bike,
than the pair of front panniers, though tying the pair into 1,
with a couple webbing strips, did help.
[Ortlieb Sport Packers..]

perhaps I need to show up in Eugene, 4 hours on the bus,

get the work done.. then get the finish powder coat re-applied...

after blasting off finish to apply additions..

Guess it doesn't matter enough , yet..

Last edited by fietsbob; 07-09-12 at 04:07 PM.
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Old 07-09-12, 02:10 PM   #4
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Wanted BiFri to weld the copy of Brompton mounting block on (which is what was done here],
Why? You already have the bike, you don`t need BF to do it- she just explained EXACTLY how to do it.
Of course, if you`re too squeemish, you could always send it to Badmother. She fear nowt.
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Old 07-09-12, 02:51 PM   #5
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@ rodar y rodar: Thank you, you do make me embarresed. I just do what I love, and think that "If you can do it I can do it", or "If you want it make it".

@ fietsbob: like he said, if you want it just do it or have it done. I added the Dahon front rack today so that I can have both. This is why I did not put the lugageblock lower. Used to have problems with the brakes last time we used the racks but I built a hub braked front wheel for the bike so now the front rack is back on.
If I stay away from offroad type riding I can use big paniers in the front. The one in the picture is a front pannier.

Attached Images
File Type: jpg brompton luggageblock and dahon frontrack2.jpg (100.5 KB, 106 views)
File Type: jpg brompton luggageblock and dahon frontrack.jpg (102.2 KB, 120 views)

Last edited by badmother; 07-09-12 at 02:59 PM.
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Old 07-09-12, 03:44 PM   #6
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More about lugage, lugageblocks and adaptors here in older posts:

http://www.bikeforums.net/showthread...-carrier-block

http://www.bikeforums.net/showthread...y-your-luggage

http://www.bikeforums.net/showthread...rompton+basket

http://www.bikeforums.net/showthread...rompton+basket

Last edited by badmother; 07-09-12 at 04:14 PM.
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Old 07-09-12, 04:10 PM   #7
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Guess i'm just busy enough to not spend the hours on the Bus to Eugene
and back, for the retrofit and refinish part of the Idea..

So, I use 2 front bags. fit a Front headlamp above them.
filling the space the other rack would go..

Last edited by fietsbob; 07-10-12 at 10:09 AM.
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Old 07-10-12, 12:20 AM   #8
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That's a pretty neat job. My solution is less elegant but works




Having done it others I think have tried using just one or two jubilee clips. Clearly three was OTT lol

I also use the Klickfix system using one of these





Regards

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Old 07-10-12, 01:31 AM   #9
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I use Klickfix also, mainly the one you posted a picture of, mainly for smaller bags.I I think it was the picture of your Moulton with the adapter on that inspired me to go furter and weld the missing piece on .
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Old 07-11-12, 09:08 AM   #10
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Nice work OP...

I'm hoping to mount a Brompton QR block to my Bike Friday Tikit's custom front PR rack so I can use the Ortlieb bag shown above. I think it will be a great combo providing a waterproof bag that looks nice enough I can take into business meetings and not needing any straps to try and hold it on the rack.



I just need to track down a fabricator to weld a bracket on my rack that the Brompton plastic QR block can be bolted onto. The summer is too nice to spend on this kind of project so I'll give it a shot in the fall.

http://thelazyrando.wordpress.com/?s=tikit+pr+rack
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Old 07-11-12, 12:49 PM   #11
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Seen another setup using Ortlieb's latching pannier hooks on the Bottom,
clipping onto the PR rack platform's tubes..

that means modifying the bag rather than the rack.

KF and Ortlieb also offer rear rack top bags and fittings
that may also make a bottom catch QR mounting scheme..
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Old 07-11-12, 03:09 PM   #12
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Quote:
Originally Posted by fietsbob View Post
Seen another setup using Ortlieb's latching pannier hooks on the Bottom,
clipping onto the PR rack platform's tubes..

that means modifying the bag rather than the rack.

KF and Ortlieb also offer rear rack top bags and fittings
that may also make a bottom catch QR mounting scheme..
I think vik is on the right track. If he was going to modify the bag instead of the rack he would have to modify every bag he wanted to use.

Also there is no limit to stuff you can buy, but setteling for one system makes sense, and a system where you easely can use the same frame on several bags if you want saves money. If you modify the bike (or the rack as vik is planing to do) you do it once and can use it forever.

Also the Brompton system can carry much more weight and bulk than the clickfix so why choose it as a main system? You can use it together with the brompton bag/frame like I show in the last pictures I posted.
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Old 07-11-12, 04:28 PM   #13
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Brompton-Ortlieb O bag is pretty much the Downtown bag with a different clip,
and 2 of their small add-on pockets

and a 100% upcharge .. over $300 down here..
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Old 07-12-12, 12:28 AM   #14
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I think vik is on the right track. If he was going to modify the bag instead of the rack he would have to modify every bag he wanted to use.
+1 - Modifying the bag is more of a PITA than changing the rack and a slick bag is important because that's the part that has to get hauled around. Last thing I want to do is hack the bag.
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Old 07-12-12, 02:23 PM   #15
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Here a lot of racks
http://www.fahrradladen-berlin.de/Er...nttraeger.html
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Old 07-12-12, 04:42 PM   #16
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Should a Gotten a Brompton.. thing is adding it to a rack attached to the fork, is
you have to swing the load in bag with the wheel, and it sits a lot higher .

a Head tube mount to the frame , the bag stays steady , wheel swings underneath it.

So my Bene Sugg ,is get the frame modification to suit the bag clip mount...

The Porteur rack thing is kind of cool.. it should swing under the bag well enough..

I got an older all steel Brompton bag support , like BM shows, above.
[as well as the new lighter nylon/aluminum one, inc with bag]

might see if it can be modified to make a bigger bottom platform..

Last edited by fietsbob; 07-12-12 at 04:46 PM.
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Old 07-12-12, 05:50 PM   #17
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Yes. Looked at a dutch site earlyer today with much the same racks. On a R20 like bike you could use the Steco Frontgepäckträger für Steuerrohr schwarz rack and get something like the rack on viks tikit if big platform is what you want rather than small fold.

Also there is racks like this made for childrens bikes with 16 or 20" wheels, and those that are atatched to the hole in the fork crown plus with stays down to canti studs or front axels (and not to the handlebars) should work well on folders and minivelos.
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Old 07-12-12, 05:53 PM   #18
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Should a Gotten a Brompton.. thing is adding it to a rack attached to the fork, is
you have to swing the load in bag with the wheel, and it sits a lot higher .

a Head tube mount to the frame , the bag stays steady , wheel swings underneath it.

So my Bene Sugg ,is get the frame modification to suit the bag clip mount...

The Porteur rack thing is kind of cool.. it should swing under the bag well enough..

I got an older all steel Brompton bag support , like BM shows, above.
[as well as the new lighter nylon/aluminum one, inc with bag]

might see if it can be modified to make a bigger bottom platform..
I think vik is a big boy and more than kapable of deciding what he need and want don`t you??
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Old 07-12-12, 10:52 PM   #19
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Should a Gotten a Brompton..
I tried and didn't like the Brompton. In fact I was offered one at cost by a dealer and decided to pay full retail for my Tikit instead. I prefer the fit, the ride and the fold over the Brompton. I'm not going to buy a bike I don't like because I can use a bag I think is cool.

Attaching the bag to the PR rack puts it lower than mounting it to the headtube. Considering the loads I have hauled on the PR rack so far I have no worries it will handle poorly with the bag attached.
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Old 07-13-12, 05:58 AM   #20
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Vik, is that a custom platform on the Tikit?
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Old 07-13-12, 10:33 PM   #21
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Vik, is that a custom platform on the Tikit?
Yes it's a custom rack based on the one that Alex W built for his Tikit. Very useful...

http://thelazyrando.wordpress.com/?s=tikit+pr+rack
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Old 07-14-12, 11:04 AM   #22
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http://toanjuan.com/my-daily-commute/

Here is my install. Had local bike shop ezgreen bike dana point machine the threads for my on the downtube nova head set. Holds at least 20 pounds securely. Best mod i did.
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Old 03-01-13, 04:05 PM   #23
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Bumping this old thread to post this interesting mod, but actually oposite to the title of the thread. Dahon luggagetruss used on a Brompton. http://www.flickr.com/photos/4806658...57632728234546
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Old 03-02-13, 03:10 AM   #24
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That's an interesting twist, thanks for posting.

The potential problem I see is that the Dahon bracket is just bolted to the Brompton lug and not supported i.e. the bolts are taking all the load. The shearing forces with a lot of weight may break the bolts.

As I am sure you realise, the Brompton block has a recess that fits snugly over the welded lug which provides support with the downward shearing force so it is not taken by the bolts which just keep it secured flush to the lug.

PS hmm looking at the later pictures I am not sure what he/she is doing with the DIY resin block ? It still looks like all the downward shearing forces are on the bolts ?



Regards

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Old 03-02-13, 06:06 AM   #25
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I got an older all steel Brompton bag support , like BM shows, above.
[as well as the new lighter nylon/aluminum one, inc with bag]
Aaaargh! That all steel frame is EXACTLY what I need to mount my Arkel shoppers! Or something like it, probably about an inch taller. The new ones are not quite tall enough and the plastic in the center is just a bit too wide for the hooks on the shoppers. I did a google search and did not find any source for old frames. Not really worth the effort to have one fabricated, since the t bag accomplishes the same thing for us.
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