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[Brompton] Solution to hold a bag upright against seatpost?

Old 08-14-14, 07:11 AM
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[Brompton] Solution to hold a bag upright against seatpost?

Hello

I don't have a rear-rack on my Brompton and simply need to haul a 24-liter Ortlieb drybag.

To keep the weight closer to the bike, I'd like to avoid using a seatpost rack such as Topeak's MTX BeamRack.

So I was thinking of keeping the bag upright, close to the seatpost, but it'd have to sit about 20cm above the frame for heel-clearance:


Any idea on what to use to sit the bag on the frame?

Thank you.
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Old 08-14-14, 08:06 AM
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Have any shops to make custom parts ?
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Old 08-14-14, 08:56 AM
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Carradice style bagman
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Old 08-14-14, 09:14 AM
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Could you possibly modify something like this, or this?
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Old 08-14-14, 02:34 PM
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Yup, the Carradice Bagman was part of my list in case I couldn't find anything else, but I'd rather keep the weight as low to the ground as possible.

Thanks for the tip on the tiny front racks. I'll take a look.

Another possibility I thought about while walking around a big sports store is to simply tape a mini basketball A 20cm-wide basketball should be wide enough to hold the Ortlieb and I could deflate it a bit so that it sits ok on the bike's frame.

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Old 08-14-14, 03:05 PM
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Rixen & Kaul, KLICKfix Adaptersysteme Fahrradzubehör, Solingen, Taschen, Körbe, Werkzeug Maybe the VARIO RACK if you dont haul too much ..
the mount- adapter are plastic composites, though the Vario has 2 places to mount it maybe 2 mounts will support more weight..
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Old 08-14-14, 08:33 PM
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I looked around a bit for you, out of my own curiosity. I found this item, which is pretty cheap (probably in quality as well as price) but it's a seatpost rack where the platform and the support are separate parts, you could easily slide the rack platform as far forward as possible and it looks as though it would nestle nice and close to the seatpost if you wanted it to. Then you could just hack off the excess.

Yelvqi Seatpost Rack


But before I'd go to that extent, I would try to just strap it in place without a rack to make sure it doesn't interfere with pealing/seating. In your image (in which I assume you copied a stock photo of the bag onto a stock photo of the bike, which are likely not in the same scale) it looks like the bag may be too close to your heals on the upstroke and too close to the back of the saddle to be comfortable. Good luck.

I keep editing this post because I keep finding things...the one linked below would likely be good too.

https://www.bicyclehero.com/us/zefal-...l#.U-1zIPldW7g
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Old 08-15-14, 07:07 AM
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Thanks for the infos on the Yelvqi and Zéfal seatpost racks.

As for the Klickfix + Vario Rack: Apparently, there's no adapter that can be removed fast from the seatpost, which is required for folding bikes since we often raise/lower the seat.
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Old 08-15-14, 09:52 AM
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hence the Brompton rack is an advantage ,, NB; you can stuff a Front touring bag quite full

just see to it the top of the load is soft so turning the bars is not restricted ..



Not very Mechanical apparently ... the quick turning of a couple screws will remove some of the KF adapters from the post .
thumb screws are the bolt equivalent of wing nuts you know..

+ NB. there are Quick release seat post beam racks, also.

moving the bag back, or higher, will give you heel clearance ..

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Old 08-22-14, 06:26 PM
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Almost there: An inflatable armband is pretty good, but it's still missing a few cm's before my heels don't hit the bag:
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Old 08-24-14, 08:06 AM
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There's a couple that toured on the Brompton and their method of attaching the rear bag was very good. Actually, they used a regular backpack!

First, you purchased the wrong Brompton and need the version that comes with the rear rack. Maybe you can still retro-fit your Brompton and install the rear rack. The Brompton rear rack is slanted and low but it's still useful in keeping the weight off the seat post.

Also, you'll need to change the rear suspenion block to one that's harder.
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Old 08-25-14, 07:16 PM
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Thanks, but I really don't like rear-racks.

Incidently, I just thought about using a small folding hand truck, possibly replacing the original wheels with inflated wheels for a faster and smoother ride.

No Weld, Lightweight, Foldable Urban Bike Trailer

A lot cheaper than a Travoy.
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