Anyone made a Pedersen?

[Mark Kelly]

Has anyone here made a Pedersen replica?

I have become increasingly fascinated by the history of unusual bikes after making the replica tension bike last year. Now Pedersen is on the radar.

Anyone got any tips? Of course mine will be built with modern technology rather than using steel but any experience with the geometry would help.

[Doug Fattic]

Marten Gerritsen is a frame builder (who goes under the title M-gineering online) and has one in his office. He lives in the coolest little village of Kiel Windeweer in the Netherlands. He is active on other bicycle and frame building forums. I don't remember now if his is an original or if he has made a replica. Contacting him would be a good place to start.

[one60]

Paul Brodie in Vancouver takes on a lot of unusual and challenging builds. He may have made a Pedersen?

https://www.handbuiltbicyclenews.com...rodies-whippet

[steve garro]

No, but I'd love to.
- Garro.

[TonyP]

I seem to remember seeing photos of one that was built by a U.S. builder on display at a recent hand made show, maybe 2022. Don't remember which show, or the builder, sorry. But a search may of hand built shows in the U.S. should find it.

[TonyP]

Found it, Bryan Hollingsworth.

https://media.theradavist.com/upload...400&quality=75

Framebuilder and all-around good chap Bryan Hollingsworth from Royal H Cycles unveiled this bike to me on the Friday before the Expo, and my mind might have begun to smoke. Not only did he ideate the construction technique – remember, these frames are essentially a series of trusses held together in tension – but he machined and retrofitted the saddle harness. He requested that the client do the actual saddle weaving himself.

https://royalhcycles.com/

[Mark Kelly]

Thanks all, I'll follow up those leads.

Yes I realise it's a tensioned truss structure, that's what got me interested.

Prelude to Albert

[lumpy]

Man, I want to hang out at your house. That tripod is so cool.

[darkmother]

Looking forward to seeing where this goes.

I've often thought of tensioned wire spoked wheels as being an incredibly efficient structure that is sometimes taken for granted. Why not a tensioned frame?

[Mark Kelly]

That tripod is so cool.

Looking forward to seeing where this goes...snip... Why not a tensioned frame?

You might notice the pic is labelled "Prelude to Albert". I liked this concept so much I'm building a new bike to exploit it further; working title "Albert", after the more unusual Lyrebird.

Anyway, back to Pedersen, I'm looking to make something like this racing model:

brian_donan_cykelrytter.jpg

Pic courtesy of https://www.dursley-pedersen.net

BTW according to that site Pedersen himself made a wooden one: https://www.dursley-pedersen.net/tra.html

[Mark Kelly]

Capture.jpg

I found with a bit of tweaking I could get surprisingly close in BikeCad.

The idea is to explore what made a Pedersen special rather than producing a replica.

Two big standouts are the cable stayed hammock seat arrangement and the absence of a head tube: the truss fork acts in its stead.

The normal iteration of the hammock seat requires the forward stay to be very high. Since this isn't a replica I felt free to reduce the forward height and instead added a couple of small diameter stays that will go from the seat truss / top truss junction to the bend in the top stay. I couldn't work out how to get BikeCAD to show these.

I am unsure about the truss fork acting as a frame member and will make sure I have room to add another truss to connect to down stays and the down tube