New Brompton Model

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Hello all.Sometime over the last couple of weeks I stumbled on an article about a new Brompton model (possible a design project) that had larger wheels. It showed the two bikes folded to illustrate the size difference. For the life of me I can't find it now. Did anyone see it, if so can you enlighten an increasingly befuddled chap.
Thanks

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mark aldridge Members Profile Send Private Message Find Members Posts Add to Buddy List Visitor (new) Joined: 29 October 2015 Location: surrey Status: Offline Points: 129	Post Options Post Reply Quote mark aldridge Report Post Thanks(0) Quote Reply Topic: New Brompton Model Posted: 12 October 2019 at 2:45pm
	Hello all. Sometime over the last couple of weeks I stumbled on an article about a new Brompton model (possible a design project) that had larger wheels. It showed the two bikes folded to illustrate the size difference. For the life of me I can't find it now. Did anyone see it, if so can you enlighten an increasingly befuddled chap. Thanks

RoyMacdonald Members Profile Send Private Message Find Members Posts Add to Buddy List BHPC Member Joined: 09 March 2007 Location: Rye East Sussex Status: Offline Points: 981	Post Options Post Reply Quote RoyMacdonald Report Post Thanks(0) Quote Reply Posted: 12 October 2019 at 9:39pm
	It was in the club magazine, Summer issue 2019, page 21. All the best Roy

atlas_shrugged Members Profile Send Private Message Find Members Posts Add to Buddy List BHPC Member Joined: 03 November 2014 Location: Cambs Status: Offline Points: 1025	Post Options Post Reply Quote atlas_shrugged Report Post Thanks(0) Quote Reply Posted: 13 October 2019 at 1:26pm
	The 20 inch wheel Brompton was a modification project presented at Spezi 2019. This was an initiative by an enthusiastic German engineer (and all credit to him). So this is not a new model that is being produced by Brompton themselves. But in the future you never know. Another (different) German engineer was also presenting a recumbent Brompton. I loved this because the rear pannier/fairing made up the back part of the seat. Once the rear pannier was removed the remains of the seat was very small in the resulting foldup package. I went to the Spezi presentation by the German engineer so if you have any questions then I would be glad to reply. Please ask them here. Howard was also at the presentation and took all the photos and has a much better understanding of the technologies and pros and cons so I hope he can also comment.

Yowie Members Profile Send Private Message Find Members Posts Add to Buddy List BHPC Member Joined: 05 March 2005 Location: NRW Status: Offline Points: 940	Post Options Post Reply Quote Yowie Report Post Thanks(0) Quote Reply Posted: 17 October 2019 at 10:13pm
	Well, I would just add a little to the info and say that not everything was upscaled equally for the experimental 20 inch folder, at least two examples of which have been built IIRC. So clearly, OEM components from Brompton were easily used on the bigger bike, which was handy. In fact, parts of a genuine Brompton frame also were used in the example we saw - around the seat tube, I think; and the head tube and main frame clamp; and parts of the rear triangle were all used to make the larger frame construction easier. In order to increase lengths, the stem, main frame and triangle were all extended by adding in extra lengths of tube, telescoped in and brazed I believe. By no means was it a botch-job - this frame was constructed by someone with good framebuilding skills. It all added up to a load more metal unfortunately. Frame clearances on the original Brompron are already close with 37 mm tyres, so there's a lot of widening going on in this bigger folder in order to fit 50 mm 406 Big Apple tyres ... Of course, it didn't have to accommodate such tyres, but it would have been churlish to go as far as they did to allow only a pair of Kojaks in there .... so one resulting feature of the design was the width of the folded package, requiring a telescopic stabiliser somewhere on the rear rack to keep it standing upright.. all these sorts of details come out of the woodwork when you try construct what seems straightforward in principal..! I can't remember what the frame stiffness was like, I never got a ride. One wonders the feasibility of using completely different gauge tubing throughout to help somewhat with the weight issue, but I'm a bit unsure how much scope for change there is from Brompton's specification. The resulting complications for tube bending and making your own hinges would be a right PIA too I suppose... One of the engineers is called Ingo Kollibay.

legs_larry Members Profile Send Private Message Find Members Posts Add to Buddy List BHPC Member Joined: 09 March 2005 Location: London Town Devine Status: Offline Points: 1554	Post Options Post Reply Quote legs_larry Report Post Thanks(1) Quote Reply Posted: 18 October 2019 at 12:10pm
	IIRC Ingo was, along with Juliane Neuß, one of the people behind the recumbent Brompton conversion from a couple of decades ago. They couldn't raise the cash to put it into production. I had a brief spin on Juliane's machine when we happened to be in Bikefix at the same time; it rode pretty well in spite of my wearing the wrong shoes and having to adopt a joke comedy knees-splayed-out attitude to cope with the minor issue of her being about 8" shorter than me.
	==================== a bit ov a lyv wyr by slof standirds