Whilst trawling the net I came across a report by someone who had apparently widened his DeDion tube using a section of scaffolding.

Any idea if this would be OK for a DeDion tube? It seems rather small on diameter and I’ve no idea what the steel spec would be but if OK would be cheaply available.

I think it would also match a concrete floor pan!

Most use 75mm round 1.6mm wall

Just casing the concrete floor pan now! Actually you pretty much confirmed ehat I thought but he was welding it to a GTS DeDion so I though it worth asking the question.

Quite a bit of twisting force goes through the tube and the shocks put a concentrated point loading into it. Caterham had to increase from 1.5 to (i think) 2.5mm, id therefore be a little nervous on thin section. Mine is (i think) 2.5 mm but never yet used in anger.

Mike

I very roughly followed rorty's plans


http://www.locost7.info/files/suspension/RortyDeDionAxleAssembly.pdf

I used several offcuts of approx 6cm diameter with a wall from 3.5 - 4mm

I was looking at some scaffold pipe lying around at work last week , it was about 50mm OD and had a wall thickness of about 5mm.It would be strong enough but was also galvanized so not easy to weld.
Paul.