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[Brompton] Saddle + seatpost-mounted luggage block

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[Brompton] Saddle + seatpost-mounted luggage block

Old 01-27-21, 01:46 PM
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Winfried
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[Brompton] Saddle + seatpost-mounted luggage block

As seen on the web, one way to mount a Brompton luggage block on a saddle + seatpost.

Apparently, you won't notice you're carrying several kilos back there.

Parts:
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Old 01-27-21, 02:25 PM
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Thanks for the transcription and finding links to the parts
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Old 01-27-21, 02:58 PM
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Interesting! Would like to see it folded up with the mech still attached. Is the front bag a L borough Brompton model?
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Old 01-27-21, 07:09 PM
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Very nice. Ingenious really. Would like to see the detail of the piece from the clamp to metal strap pieces. I guess it is just thu bolted and no extra piece. I never really noticed any load from the Swift Cross Rack on the Swift. Curious that having weight higher up does not seem to effect handling.

Last edited by Schwinnsta; 01-27-21 at 08:02 PM. Reason: Changed to the text
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Old 01-28-21, 04:46 AM
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Yes, it's just bent and bolted.

Apparently, the weight isn't felt, thanks to the seatpost clamp.

It'd be interesting to test ride that solution and Carradice's.

Last edited by Winfried; 01-28-21 at 04:51 AM.
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Old 01-28-21, 01:36 PM
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Originally Posted by 3speedslow View Post
Interesting! Would like to see it folded up with the mech still attached. Is the front bag a L borough Brompton model?
Either the T-Bag or the Borough L.

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Old 01-28-21, 02:55 PM
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Here's the link to an alternative the the Xootr Cross Rack seatpost mount: V-Rack Seatpost Carrier – Vincita Co., Ltd.
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Old 01-28-21, 04:20 PM
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However, it won't take a Brompton bag, and, although it sticks out a lot, offers no quick-release lever so the adapter can be removed when folding the Brompton.


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Old 01-28-21, 05:31 PM
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HERE’s another example using the standard Brompton brackets - but seat post luggage mounts give me the Willies. There’s a lot mechanical leverage involved when you mount weight so far back and/or so high up on long arms. The OEM set-up works well because it’s frame mounted and tips the bag backward which places the bag’s CoG over the mount, or at least quite close.

Weight + long levers + ‘bouncing’ over road imperfections = additional stress to both the plastic luggage brackets and the seat post, and in directions they weren’t really designed for. IIRC, Brompton even advised not to attach large/heavy seat bags due to the leverage of the long seat post.

Anyways, just my $0.02, YMMV and all - it’s your bike to use as you please.
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Old 01-28-21, 05:49 PM
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I agree, which I why, in addition to the frame-mounted front bag, I use the rear rack to carry the rest 1) on the frame 2) as low to the ground as possible for maximum stability, like this guy did below — I carry less stuff myself.

I just mentioned that option above for science's sake :-)

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Old 01-28-21, 08:16 PM
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Originally Posted by Winfried View Post
I just mentioned that option above for science's sake :-)
I am thinking about an attachment for Andersen Shopper or B-Tourist there .
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Old 01-29-21, 05:19 AM
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Good call.

A while back, I emailed Andersen to suggest a seatpost clamp for bikes that either don't have a rear rack or have small wheels… but they don't seem interested, and I don't know of a third party solution.

People's/Poor man's Burley Travoy:
Any other Burley Travoy style trailers out there? Or homemade ideas?
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Old 02-15-21, 07:05 PM
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Simple DIY solution:
see https://mybikesite.org/#CarrierBlockMount



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Old 02-16-21, 04:42 AM
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There's a business opportunity right there.
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Old 03-13-21, 06:20 AM
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New pics



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